Earlier, we mentioned that AS-i wasnt appropriate for IS applications. Therefore, another solution was sought for the discrete devices in the electrically classified space. An IS implementation with FISCO and an IS solution were envisioned for the discrete devices. We tried to keep host controller cabinets in safe-area spaces, and only allow I/O subsystems in process spaces. IS remote I/O was installed in the process space to interface to low-power solenoid operators for valve actuators, valve-position limit switches, rupture-disk indicators and transfer-panel proximity switches. The remote I/O modules are intrinsically safe, but the communications (Profibus-DP) to each are not. Profibus-DP cant be implemented intrinsically safe, even though its a non-incendive design. Our experience with fieldbus shows there are some fieldbus devices that lend themselves nicely to biopharma applications. A few instruments can illustrate this point. The first is the Rosemount 848T temperature transmitter, which also allows for other input types besides RTD and thermocouple. Steam-in-place (SIP) is a common process in biopharmaceutical facilities for sterilizing process vessels and piping. SIP is usually automated, with multiple temperature elements at various low-point condensate drains, and usually has five to eight temperature elements per vessel. In the case of a bioreactor, the temperature element count can approach 30 or more. In the early design stages of our cell-culture facility, there was some concern about how to handle the many RTD inputs with a bus system. Certainly, a Foundation fieldbus transmitter for each input would be unwieldy from a construction standpoint, not to mention the cost. Fortunately, 848T allows up to eight inputs per instrument, which reduces the device count. We also use this device to convert conventional 4-20 mA/DC devices to Foundation fieldbus. Likewise, Micromotion mass flowmeters are used extensively in our facility, such as on chromatography skids. From one fieldbus connection to the
Products & Services
Fieldbus products are industrial automation products used in industrial network communications on factory floors.
Universal Process Controllers
Universal process controllers constitute a broad area of control devices that may be employed in the monitoring and control of many different process variables, including temperature, pressure, flow and other values.
Web controllers maintain control functionality over processes with web or sheet rollers. Control functionality includes maintaining tension of the web, centering on the track, and material feed rates.
Pressure controllers accept input from pressure sensors, transmitters, gauges, and other devices and subsequently control adjustment to the pressure to maintain or achieve the desired pressure level.
Acromag's network I/O products provide a variety of remote I/O and distributed control solutions on many of the popular fieldbuses. Analog and discrete I/O modules interface sensors and actuators to...
Topics of Interest
Genzyme Corp. recently installed a multi-bus control system platform at its 12-year-old pharmaceutical facility in Allston, Mass. This was our first introduction to bus technology at Genzyme, and our...
By William T. Dolan, P.E., Genzyme Corp. The fieldbus architecture allows controller cabinets to be maintained in an orderly way. Figures 3 and 4 (above) offer a before and...
By William T. Dolan, P.E., Genzyme Corp. Valve control for open/close valves and the discrete input devices used in the general purpose electrical environment could be easily addressed with the simple...
By Gary Forrest, Ph.D., Associate Director-Bioprocess Development, Wyeth Research Editors Note: Part 1 of this article appeared in our November/December 2007 issue, pp. 25-30. System...
By Gary Forrest, PhD, Wyeth Research For the Foundation fieldbus devices, a single wire entered the cabinet for connection to a Relcom fieldbus connector block. Each of the Foundation fieldbus devices...