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Number of Axes / Motors:

Rated Power:

Motor(s) Controlled:

Specialty Controllers:

Computer Bus (if PC-Based):

Supply Voltage (AC):

Supply Voltage (DC):

Maximum Output Voltage:

Continuous Output Current:

Peak Output Current:

AC Input Phase:

AC Input Frequency:

Operating Temperature:

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Setup & Control:

Mode of Operation:

Motor Feedback:

Configuration:

Features:

Communication Standards:

Help with Motor Controllers specifications:

Number of Axes
   Number of Axes / Motors       Number of axes or independent motors that the device can drive or control. Follower or dependent axes are often listed as "half" axes. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Rated Power
   Rated Power       Power rating for the driven motor or actuator, often a nominal rating. Specified in watts or horsepower. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
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Motors Controlled
   Motor(s) Controlled       
   Your choices are...         
   DC Brushed Motor       Rotary brushed motors commutate via physical contacts, often spring-loaded graphite brushes biased against the commutation bar. 
   DC Brushless Motor       Brushless motors commutate electronically with no physical brush contact. One common technique for positional feedback to control commutation is the use of Hall effect sensors to detect rotor position. Commutation options include trapezoidal and sinusoidal drive signals to the motor. 
   DC Servomotor       DC servomotors can be of brush or brushless design, and are used for position control and other industrial automation applications. If brushless, the commutation of the three phases will typically be either trapezoidal or sinusoidal; the term "DC Brushless" often connotes trapezoidal commutation of a brushless motor with Hall Effect sensor feedback for commutation control. 
   AC Induction Motor       Induction motors derive their name from the fact that current is induced into the rotor windings without any physical connection with the stator windings (which are directly connected to an AC power supply); adaptable to many different environments and capable of providing considerable power as well as variable speed control. Typically there is "slip," or loss of exact speed tracking with induction motors. 
   AC Shaded Pole Motor       This motor contains an auxiliary winding around a portion of each pole of the motor. This winding, called the shading coil, provides the rotating magnetic field for the motor to run. These motors are often used for fans and can be varied in speed with TRIAC controls. 
   Permanent Split Capacitor Motor       A PSC (Permanent Split Capacitor) motor uses run and secondary windings and a capacitor that is permanently connected to the power source. These motors are often used for fans and can be varied in speed with TRIAC controls. 
   AC Synchronous Motor       Synchronous motors operate at constant speed up to full load. The rotor speed is equal to the speed of the rotating magnetic field of the stator; there is no slip. Reluctance and permanent magnet are the two major types of synchronous motors. A synchronous motor is often used where the exact speed of a motor must be maintained. 
   AC Pole Number Control Drive       Pole Number Control is a feature that is applicable only to drives that work with Pole Changing Motors (PCMs). PNC is a method for changing the number of poles on the primary winding. PNC is useful in general-purpose speed control applications that involve two to four constant speeds. 
   AC Sensorless Vector Drive       Vector drives employ independent control of both the voltage and frequency supplied to the motor for good speed control, and low-speed torque output approaching that of DC motors. Sensorless indicates that no feedback sensor such as an encoder or resolver is used. 
   AC Vector / Feedback Drive       Vector drives employ independent control of both the voltage and frequency supplied to the motor for good speed control, and low-speed torque output approaching that of DC motors. An encoder, resolver, or other feedback device is employed to provide position and speed feedback for highly accurate speed control and maintenance. 
   AC Servo / Brushless Motor       AC servomotors are typically permanent magnet synchronous motors that can often have low torque-to-inertia ratios for high acceleration ratings. They frequently employ brushless commutation with feedback provided by Hall Effect sensors, and sinusoidal winding excitation. 
   Unipolar Stepper Motor       In unipolar or bifilar stepper motors, the current flows in only one direction in each winding.  Simpler construction than a bipolar stepper, but does not typically generate as much torque. 
   Bipolar Stepper Motor       Bipolar stepper motors employ two winding through which the drive current is alternated. Bipolar drives and motors typically generate more torque than unipolar systems, and they require more sophisticated electronic circuitry. 
   Permanent Magnet Stepper Motor       Permanent magnets are used on the rotor. Step angles range from 1.5 to 30 degrees. It is the most common and versatile stepper motor. This includes both unipolar (bifilar) and bipolar types. 
   Variable Reluctance Stepper Motor       Free-moving rotor; no residual torque is produced due to the lack of a permanent magnet. The rotor is instead composed of a soft iron metal. Rotor is also composed of its own very prominent poles, tending to stick out more than a rotor found on the PM version. Step angles: 7.5 to 30 degrees single power source required (like a bifilar PM motor). This is the least expensive stepper motor. 
   Hybrid Stepper Motor       Consists of a heavily toothed PM rotor and toothed stators, plus prominent rotor poles like a VR rotor. Very fine step angles: 0.5 to 15 degrees. High-speed capability (less chance of a stall). Higher available torque than PM or VR stepper motors. Most effective but most expensive stepper motor type. 
   Full Step Motor       Full step stepper motors move in increments of the actual magnetic "detent" positions. No electronic or control enhancement of resolution. 
   Half Step Motor       In half-step drive / control, the stepper motor can be positioned halfway between the magnetic stop positions. Resolution during drive is doubled, and the motor will advance to the next magnetic position when power is disconnected. 
   Microstepping Motor       In "mini-stepping" or "micro-stepping" motors, a discrete number of angular positions are defined between each full step position such as 8, 16, or even much higher. Mini-stepping and micro-stepping are techniques using electronic control to enhance the position resolution of the control system. 
   Linear Motor       Linear motors generate force only in the direction of travel. The motor technology resembles rotary motor technologies simply oriented in a linear fashion. Linear motors are capable of extremely high speeds, quick acceleration, and accurate positioning. Linear motor technologies include moving coil, moving magnet, AC switched reluctance design, AC synchronous design, AC induction or traction design, linear stepping design, DC brushed design, and DC brushless design. 
   Voice Coil Motor       A voice coil motor consists of a magnetic coil placed in a magnetic field.  When current is applied to the coil, electromagnetic flux is generated that causes the coil to move.  So named due to its resemblance to audio speaker operation. 
   Pneumatic Motor / System       Pneumatic motion control includes positioning and pressure / force control for systems composed of pneumatic valves and actuators such as cylinders, air motors, escapements and rotary stages. 
   Hydraulic Motor / System       Hydraulic motion control includes positioning and pressure / force control for systems composed of hydraulic and electrohydraulic actuators such as cylinders, hydraulic motors, and rotary stages. 
   Other       Other unlisted, specialized or proprietary style of motor or axis drive. 
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More Specs
   Specialty Controllers      The categories below are additional descriptions of drive types.  Many drives and controllers can be categorized as one or more of these; this set of categories is based directly on supplier terminology, and multiple descriptions are possible.
   Your choices are...         
   Battery Controlled       Battery controlled drives are designed to operate on battery power and may have additional design considerations to extend battery life or in general make more efficient use of the available power. 
   Combination Controller / Drive       Integrated unit with both motion control and motor drive or amplifier functions on board. 
   Multi-axis Controller       Motion controllers that control and/or monitor multiple independent axes of motion, typically one motor per axis. 
   Motor Speed Controller       Control units for motor speed, braking, and often torque control.  Speed controllers are often application-specific for uses such as conveyor or web control, electric vehicle control, etc. 
   Robotic Motion Controller       Robotic controllers use digital motion control hardware and software for the coordinated multi-axis control of industrial robots and robotic systems 
   Servo Amplifier       Servo amplifiers are electronic modules that convert low level analog command signals to high power voltages and currents to operate a servomotor. 
   Variable Speed Drive       Variable speed drives monitor and control industrial motor applications where speed control and adjustment is required. 
   Regenerative Drive       Regenerative drives support motor braking and take the power generated by the braking action and send it back to the power source, such as the AC line or a battery. 
   Inverter Drive       Inverter drives convert an AC power input into a DC voltage, and then convert it back to an adjustable or high-frequency power signal. 
   High Frequency Drive       High frequency drives supply power to AC motors at frequencies much higher than standard power frequency for high-speed industrial applications. 
   TRIAC Control       A drive that uses a TRIAC (Triode for Alternating Current) as the output method to control an AC motor.  
   SCR Drive       DC motor drive that uses SCR (Silicon Controlled Rectifiers) circuits for rectification of the AC input to produce the DC drive current. 
   PWM Drive       DC motor drive using PWM (Pulse Width Modulation) to regulate the DC voltage level output to the motor. 
   PC-Based Motor Controller       PC-based motion control incorporates hardware and software in an industrial computer configuration for single or multi-axis motion control. 
   DSP-based       Digital signal processors (DSP) are special microprocessors used where real-time manipulation of large amounts of digital data is required in order to improve or modify it. They are used for fast and high resolution motion control, and special programming equipment is used to program the DSP chip. 
   Microcontroller Based       Microcontrollers are complete computer systems on a chip, typically combining an arithmetic logic unit (ALU), memory, timer/counters, serial port, input/output ports (I/O) and a clock oscillator. Microcontrollers require programming from external devices. 
   Other       Other unlisted, specialized, or proprietary motion control or motor drive technology. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Computer Bus (if PC-Based)      This selection is for boards only that plug into the exiting bus of an industrial computer.  These buses collectively can be considered "PC-Based."
   Your choices are...         
   ATA       Advanced technology attachment (ATA) is a serial interface standard that extends the ISA bus of the IBM PC-AT to attach peripherals. The original ATA is better known as IDE. There are several types of ATA. ATA-33 (Ultra ATA, Ultra DMA, UDMA and DMA-33) supports multiword DMA mode 3 running at 33 MBps. ATA-66, an ATA version proposed by Quantum Corporation and supported by Intel, doubles ATA-33's throughput to 66 MBps. ATA-100, another ATA version proposed by Quantum Corporation and supported by Intel, supports 100 MBps. 
   Compact PCI       CompactPCI is a high performance industrial bus that uses the electrical standards of the PCI bus packaged in a Eurocard. The specifications of the CompactPCI bus were developed and maintained by the PCI Industrial Computers Manufacturers Group (PICMG). It is used extensively in systems that require high speed transfer of data, such as data communication routers and switches, real-time machine control, real-time data acquisition, military systems, etc. 
   IDE / EIDE       Integrated Drive Electronics (IDE) is an electronic interface between a computer motherboard and the computer's disk storage devices. The IDE interface is based on the IBM PC ISA 16-bit bus standard, but it is also used in computers that use other bus standards. There are also enhanced and partially enhanced versions of IDE referred to as EIDE that are commonly used in modern computers. The "Integrated Drive" refers to the disk drive controller being built into the logic board of the disk drive. 
   ISA / EISA       Industry standard architecture (ISA) buses can handle 16-bit data transfers at a clock speed of 8 MHz. They are also capable of handling memory under 16 MB. Extended ISA (EISA) is an enhanced version of the ISA bus. EISA buses run at 8 MHz, are capable of 32-bit data transfers, and can access all memory in the system. 
   MULTIBUS® (I & II)       MULTIBUS® is a popular, modular computer-systems architecture used in embedded applications in telecommunications, manufacturing automation, and networking. The original 16-bit design is referred to as MULTIBUS I. The current 32-bit version is called MULTIBUS II or IEEE 1296. MULTIBUS is a registered trademark of Intel Corporation.  
   PC/104 (PC/104-Plus, EBX, ETX)       PC/104 derives its name from the acronym for personal computers (PC) and the number of pins used to connect cards (104). PC/104 cards are much smaller than ISA bus cards and stack together, eliminating the need for a motherboard, backplane, and/or card cage. PC/104-Plus combines the PCI bus with the PCI/104 form factor for faster data transfers. Embedded board expandable (EBX) is a small (5.75” x 8”) form factor for single-board computers that supports PC/104 expansion.   Embedded technology extended (ETX) is a form factor for developing embedded systems that eliminates cables and connectors. The ETX-PC has a small footprint, 114mm x 95mm, and a maximum thickness of 12mm. 
   PCI / PCI-X       Peripheral component interconnect (PCI) is a local bus system designed for high-end computer systems. PCI buses transfer 32 or 64 bits of data at a clock speed of 33 MHz. They also support 3 to 5 critical peripherals, which are either integrated directly onto the motherboard or added via expansion cards. PCI buses fully support cards that were developed for standard I/O buses. PCI extended (PCI-X) is an enhanced PCI bus that is backward compatible with existing PCI cards and features speeds up to 1 Gbps. PCI-X was designed by IBM, Hewlett Packard (HP), and Compaq to increase the performance of high bandwidth devices such as Gigabit Ethernet, Fibre Channel, and clustered processors. Versions of PCI-X include PCI-X 66, PCI-X 133, PCI-X 266 and PCI-X 533.   
   PMC       PCI mezzanine card (PMC) is a form factor, not a bus. It is electrically equivalent to the PCI bus, but has a different shape and bus connectors. PMC is designed for rugged applications and provides a secure mounting platform for VME mezzanine boards. It is connected as a daughter card to a special connector on a PCI board as a peripheral device. 
   PXI       PCI extensions for instrumentation (PXI) is a superset of CompactPCI that adds timing and triggering functions, imposes requirements for documenting environmental tests, and establishes a standard Windows®-based software framework. Windows is a registered trademark of the Microsoft Corporation. 
   STD       STD is often called the "blue collar bus" because of its rugged design and use in industrial and process control applications. There are three STD bus types: STD Z80, STD80, and STD 32. The STD Z80 bus and the STD 80 bus use a 56-pin backplane with 0.125" contact spacing for card interconnection. The STD 32 Bus provides a 32-bit wide data bus to support 8, 16, and 32-bit data transfers. Dynamic bus sizing, which varies the data path size depending on the requirements of the peripheral card being addressed, gives the STD 32 bus added flexibility. 
   VMEbus       VersaModule Eurocard bus (VMEbus) is a popular, 32-bit bus used in industrial, commercial and military applications. The VMEbus is based on the VME standard, which defines mechanical specifications such as board dimensions, connector specifications and enclosure characteristics, as well as the electronic specifications for sub-bus structures, signal functions, timing, signal voltage levels, and master/slave configurations. The VMEbus uses 3U and 6U Eurocards, rugged circuit boards that provide a 96-pin plug instead of an edge connector for durability. Several VMEbus varieties are available.  
   VXI / MXI       VME extensions for instrumentation (VXI) are an electrical and mechanical standard used mainly with automatic test equipment (ATE). VXI allows equipment from different vendors to work together in a common control and packaging environment. Multisystem extension interface (MXI) is a general purpose, 32-bit, 8MB/s multi-driver system bus. Normally it is used for connection of up to 8 digital devices and expansion boards. 
   Other       Other unlisted, specialized, or proprietary bus. 
   Search Logic:      Products with the selected attribute will be returned as matches. Leaving or selecting "No Preference" will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Supply Voltage (AC)       Range of AC input voltage for which the drive or controller will operate. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Supply Voltage (DC)       Range of DC input voltage for which the drive or controller will operate. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Maximum Output Voltage       Maximum output voltage of the device. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Continuous Output Current       Continuous current rating. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Peak Output Current       Capacity for current output for a very short period. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   AC Input Phase       
   Your choices are...         
   Single Phase       The AC input is single phase. Single phase is the more commonly used AC type. Usually but not exclusively for lower voltage applications. 
   Three Phase       The AC input is three phase power.  Three phase input is typically used for high voltage power supplies. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   AC Input Frequency       
   Your choices are...         
   50 Hz       Will accept 50 Hz AC input. 
   60 Hz       Will accept 60 Hz AC input. 
   400 Hz       Will accept 400 Hz AC input. 
   Other       Other unlisted frequency. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Operating Temperature:       The operating temperature of the power supply. 
   Search Logic:      User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
   Setup & Control       
   Your choices are...         
   Manual       Drive / control settings are made with manual settings such as knobs, DIP switches, jumpers, or potentiometers. 
   Diskette / EPROM       Program is held in a removable, nonvolatile storage media such as a floppy disk, diskette, or EPROM. 
   PCMCIA (PC Card) Slot(s)       Controller or drive contains slots or connectors for PCMCIA (PC Card) modules, which can contain memory, programming, and other peripheral capacity. 
   Joystick       Controller or drive can be operated with a joystick for motion control. 
   Computer Interface       Drive / control is configured, calibrated, and diagnosed via a computer connection. 
   Control Panel       Integral control panel with interface such as a keypad, touch screen, or other local programming interface. 
   Handheld Controller / Programmer       Device can be controlled or programmed from a handheld controller or remote control. 
   Wireless Communication       Communication, setup, and control are possible via remote wireless control interface. 
   Web Enabled       Device contains hardware and software protocols such as Hypertext Transfer Protocol (http) or Web Access Protocol (WAP) for being addressable to, or a node of, the World Wide Web for remote monitoring or communication. 
   Other       Unlisted, specialized, or proprietary method of control or setup interface. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Mode of Operation       
   Your choices are...         
   Digital Position Feedback       Uses digital position feedback to control motor, in addition to speed sensors. A very common feedback device is a rotary encoder, with either incremental or absolute position signals.  Position errors are calculated and compensated by the drive in real time. Use of feedback is referred to as "closed-loop control." 
   Analog Feedback       An analog signal from a device such as a LVDT or potentiometer is used as the feedback for position; errors are quickly corrected by the drive. Analog feedback is typically a voltage signal, but may include frequency or DC current signals also. 
   Velocity Mode       Direct feedback of motor speed is provided to the drive, and corrections are made with the motion control algorithm. 
   Voltage (BEMF / Open Loop) Mode       No direct feedback from the motor via encoder, resolver, tachometer, or other device.  The motor speed is inferred from the back EMF of the motor. 
   Current (Torque) Mode       Current to the motor is sensed and fed back to the drive. 
   Encoder Following / Slave       Can be run via feedback from another axis in a proportional or other defined way; descriptions include "encoder following," "electronic gearing," and "slave axis." 
   Other       Other unlisted, specialized, or proprietary mode of operation. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Motor Feedback       
   Your choices are...         
   Hall Effect       Hall effect sensors detect the magnetic field induced by one or more rotating magnets on the motor rotor. The sensing of position or speed allows the drive to electronically commutate the motor at the correct sequence and timing. 
   Resolver       Resolvers contain a rotating coil and two stationary coils 90° apart. By measuring the currents generated in the stationary coils through induction and comparing them, resolvers provide precise measurements of the rotor position. Resolvers depend on magnetic fields rather than electronics and thus work well in applications with high vibration, shock, and extreme temperatures. 
   Tachometer       Tachometers sense rotational speed and provide the feedback to the drive for subsequent control signals. 
   Incremental Encoder       Incremental encoders rely on multiple channels of position detection. A very typical configuration is two position signals 90° out of phase, or in quadrature, with an additional index or direction signal. Due to the limited number of signals, incremental encoders re-zero every time they are powered up.  The most common technology is optical, with a glass disk with lines etched at precise angular increments providing position information. 
   Absolute Encoder       Absolute encoders provide many signals concerning motor position, so many that it is possible to determine exactly the angular position at power-up. Like incremental encoders, there are different technologies, with optical being the most prevalent. 
   Analog Position       Analog position signals include infinitely variable voltage signals from devices such as LVDTs, potentiometers, and other analog devices. 
   Sine / Cosine       Sine / cosine feedback typically comes from optical encoders whose signals, in quadrature, have not been conditioned into square waves. Such signals have a theoretically infinite resolution; they may be practically limited by the electronics processing the signal. 
   Other       Unlisted, specialized, or proprietary method of motor position or speed feedback. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Configuration       
   Your choices are...         
   IC / PCB-Mounted       Integrated circuit (IC) chip, chipset, or module that mounts onto a printed circuit board (PCB). 
   PC Board       Device is a printed circuit board that installs into a backplane or motherboard of an industrial or personal computer, PLC, etc. 
   OEM Module       Designed for incorporation by original equipment manufacturers (OEMs) into their products. 
   Stand Alone       Fully packaged unit that stands alone and communicates with other devices through a standard communication protocol. 
   Panel Mount       Device mounts onto a panel, wall, or chassis of a larger system; includes slot or "bay" modules. 
   DIN Rail       Device is designed to mount onto a standard size DIN rail. 
   Rack Mount       Mounts into a standard rack system, such as a 19" rack enclosure. 
   Other       Unlisted, specialized, or proprietary mounting configuration. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Features       
   Your choices are...         
   Soft Start       Control circuitry designed to allow the controlled motor to ramp up to full speed over time. This is often designed as a safety feature for motors moving large or fragile loads, and as a preventive measure for excessive current draw. 
   Dynamic Braking       Method of motor braking in which the power supply is disconnected from the motor windings; the rotating motor then functionally become a generator whose power (heat) is dissipated through an often sizable resistor shunt across the windings.  Also referred to as "rheostatic" or shunt resistor braking. 
   Injection Braking       Applicable to AC motors only. The AC power is disconnected from the windings and a DC current is "injected" into the windings, creating a magnetic field opposing the motor rotation, thereby slowing and stopping the motor. 
   Regenerative Braking       Method of motor braking somewhat similar to dynamic braking, in which the motor is disconnected from the power supply, and the power generated from the rotating motor is sent back to the supply.  In some configurations, this generated power is used to recharge a battery that supplies the power to the drive. 
   Brake Output       Relay or switch output designed to activate or control an external brake. 
   Home / Limit Switch Input       Device has inputs for home and/or limit switches, indicating start, stop, or end-of-travel positions of the associated axes. 
   Auxiliary I/O       Additional channels of input and/or output for communication with or feedback from the device. 
   Alarm / Status Monitoring       Function in which one or more parameters are monitored for compliance with design operating parameters. In the case of a fault or non-compliant operation, an alarm or other signal can be generated to alert the operator or control system for appropriate action. Examples include overvoltage, overcurrent, and overspeed protection, temperature monitoring, and torque limiting interlocks. 
   Self-Configuration / Auto-tuning       The unit is designed to detect operating conditions and independently adjust its settings for optimal system performance. 
   Self-Diagnostics       Device can intelligently detect fault conditions or other system problems and report the specific problem to the operator or control system. 
   Electric Vehicle Design       Designed primarily for control of electric motors in industrial, recreational, or other electric vehicles. Many include application-specific features such as reverse alarm output, signal for speedometers and tachometers, etc. 
   Other       Other unlisted or specialized features. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Communication Standards       
   Your choices are...         
   ARCNET       Attached resource computer network (ARCNET) is an embedded, high-speed, token-based network technology that provides local area network (LAN) communications between computers. ARCNET relies on a bus or star topology and can support up to 255 nodes. Different versions run at speeds of 1.5 Mbps, 20 Mbps (ARCNET Plus), and 100 Mbps. 
   AS-i       The AS-interface (AS-i) is a network system for the lower field range of the automation level. It is suitable for networking binary actuators and sensors. The use of a special integrated circuit (IC) allows AS-i to be integrated with small devices in a cost-effective manner. 
   Beckhoff I/O       Beckhoff I/O combines open fieldbus protocols with the proprietary Beckhoff bus terminal system. KBUS extension technology facilitates connections between the bus terminal and a large variety of devices. 
   CANbus       Controller area network bus (CANbus) is a high-speed serial data network designed for harsh electrical environments and real-time control applications. It operates at data rates up to 1 Mbps and provides excellent error detection and confinement capabilities. 
   CANopen       CANopen is a communication standard based on controller area network (CAN) technology and optimized for embedded systems in industrial control environments. Its network protocol contains many predefined network functionalities, making it suitable for flexible, application-specific, systems. 
   DeviceNet       DeviceNet uses controller area network (CAN) protocol to connect industrial devices such as limit switches, photoelectric cells, valve manifolds, motor starters, drives, and operator displays to programmable logic controllers (PLCs) and personal computers (PCs). 
   Ethernet       Ethernet is a local area network (LAN) protocol that uses a bus or star typology and supports data transfer rates of 10 Mbps. The Ethernet specification is the basis for the IEEE 802.3 standard, which specifies the physical and lower software layers. To handle simultaneous demands, Ethernet uses carrier sense multiple access / collision detection (CSMA/CD) to monitor network traffic. 
   IEEE 1394 (FireWire®)       IEEE 1394 or FireWire® is an interface standard adopted by the Institute of Electrical and Electronics Engineers (IEEE) for very fast digital data transfers such as streaming video. IEEE 1394 connectors are used to transmit and receive data among FireWire devices, and are designed to replace external high-speed peripheral connections to personal computers, including hard disks, CD-ROMs, DVDs, graphics cards, high-speed scanners, direct video, monitors, etc. Tiny, robust FireWire connectors will also become important parts of home entertainment, communication, and appliance networks. FireWire is a registered trademark of Apple Computer, Inc.  
   FOUNDATION Fieldbus       The FOUNDATION fieldbus is a serial, all-digital, two-way communication system that serves as a local area network (LAN) for factory instrumentation and control devices. It uses a line or tree topology and distributed data transfer (DDT). In the hierarchy of digital networks, the FOUNDATION fieldbus is on the lower end. 
   GPIB (IEEE 488, HPIB)       The general-purpose interface bus (GPIB) is designed to connect computers, peripherals and laboratory instruments so that data and control information can pass between them. It was originally developed by Hewlett Packard (HP) and called the HPIB bus. GPIB is also known as the IEEE 488 bus, and is electrically equivalent to the IEC 625 bus.   
   IEEE P1451       IEEE P1451 is a standard designed to produce network-capable, network-independent smart sensors. All transducers are identical, regardless of the target network or fieldbus.  
   INTERBUS®       INTERBUS® is a fieldbus network based on the cyclic, serial transmission of input/output data between a master and slave stations. Common versions include INTERBUS-S®, INTERBUS-R®, and INTERBUS-MUX® (MUX). INTERBUS, INTERBUS-S and INTERBUS-MUX are registered trademarks of Phoenix Contact GmbH & Co. 
   Parallel Interface (PC printer port, Centronics®)       Parallel channels can transfer more than one bit simultaneously. They connect to a computer through a parallel port. Common protocols include standard parallel port (SPP) and enhanced parallel port (EPP). 
   PROFIBUS®       The process fieldbus (PROFIBUS®) is a popular, open communication standard used in factory automation, process automation, motion control, and safety applications. PROFIBUS is standardized in IEC 71158 and IEC 61784 and is suitable for both fast, time-critical applications and complex communication tasks. PROFIBUS is a registered trademark of PROFIBUS International. 
   RS232       RS232 is an interface between data terminal equipment and data communications equipment employing serial binary data interchange. 
   RS422       RS422 is a balanced serial interface for the transmission of digital data. It was designed for greater distances and higher Baud rates than RS232. 
   RS485       RS485 is a balanced serial interface for the transmission of digital data. The advantage of a balanced signal is the greater immunity to noise. The difference between RS422 and RS485 is that RS485 can be transformed into a multi-point application. 
   SCSI       Small computer systems interface (SCSI) is an intelligent I/O parallel peripheral bus with a standard, device-independent protocol that allows many peripheral devices to be connected to the SCSI port. A single SCSI bus can drive up to eight devices or units: the host adapter or controller, and seven other devices. Each device is assigned a different SCSI ID, ranging from 0 to 7.  SCSI formats include SCSI-1, SCSI-2, SCSI-3, Wide SCSI, Fast SCSI, Wide Fast SCSI, Ultra SCSI, Ultra2 SCSI, Ultra3 SCI (Ultra160), Ultra 320 SCSI, and Ultra640 SCSI. 
   SDS       Smart distributed system (SDS) is an advanced bus system for intelligent sensors and actuators using CAN-based technology. SDS uses a single 4-wire cable and can interface up to 64 nodes with a maximum of 126 addresses. Typical applications include packaging and food processing equipment, material handling, conveyor systems, and automated storage retrieval systems. 
   Sensoplex®       Sensoplex® is a master/slave fieldbus system that allows for the direct interconnection of field devices such as sensors and actuators to a controller, via a single coaxial cable. Sensoplex is a registered trademark of Hans Turck GmbH & Co. 
   SERCOS       Serial real-time communications system (SERCOS) is an open-standard, digital drive interface specification for communications between controllers and intelligent devices. SERCOS is designed for the high-speed serial transmission of standardized closed-loop data in real-time over a noise-immune fiber optic cable. 
   Seriplex       The Seriplex interface uses a four-wire cable that provides both communication and power. Embedded and non-embedded application specific integrated circuits (ASIC) are used to control the components connected to the bus, and to provide addressing capabilities. Seriplex devices include pushbuttons, contactors, valves, limiters, sensors, and actuators. 
   SynqNet®       SynqNet® is a digital motion control interface for connections between controllers and drives. It was developed specifically to optimize high-performance motion control. SynqNet is a registered trademark of Motion Engineering. 
   TTL       Transistor-transistor logic (TTL) is a common type of digital circuit in which the output is derived from two transistors. 
   USB       Universal serial bus (USB) is a 4-wire, 12-Mbps serial bus for low-to-medium speed peripheral device connections to personal computers (PC), including keyboards, mice, modems, printers, joysticks, audio functions, monitor controls, etc. The USB design is standardized by the USB Implementers Forum (USBIF), an organization that includes leading companies from the computer and electronics industries. The current USB specification is USB 2.0, which supports data transfer rates of up to 480 Mbps. 
   VMEbus       VMEbus is based on the VME standard, which defines mechanical specifications such as board dimensions, connector specifications and enclosure characteristics, as well as the electronic specifications for sub-bus structures, signal functions, timing, signal voltage levels, and master/slave configurations. The VMEbus uses 3U and 6U Eurocards, rugged circuit boards that provide a 96-pin plug instead of an edge connector for durability. Several VMEbus varieties are available.  
   Other       Other unlisted, specialized, or proprietary network systems. 
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