4-ch Counter/Frequency Module -- ADAM-5000/485-AE
from Advantech Co., Ltd.

Function Mode: Counter (Up/Down, Bi-direction) Frequency. Input Frequency: Frequency Mode: 0.3~1000 Hz Counter Mode: 5000 Hz max. Minimum Pulse Width: 500 μ sec. (Frequency Mode), 100 μ sec. (Counter Mode). Isolated Voltage: 1000 VRMS. Programmable Digital Noise Filter: 1~65000 μ sec. [See More]

  • Network and Connectivity: MODBUS
  • PAC Module: Counter Module
Networking Communications Module -- Model 2217T
from Control Technology Corporation

For 2600XM and 2700 series controllers [See More]

  • Network and Connectivity: Ethernet / TCP/IP; MODBUS; CTNet, UDP, TCP/IP
  • Ports / Interfaces: Ethernet; RS232
  • PAC Module: Communications Module
  • Digital I/O: 2
Analog Input Module -- M-7017
from ICP DAS USA, Inc.

Modbus protocol, zero drift over voltage protection 6 differential channels [See More]

  • Network and Connectivity: MODBUS
  • Digital I/O: 0
  • PAC Module: Analog I/O Module
  • Analog I/O: 8