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This system solved the use of conventional control panel technology with individual controls, as well as hardwired controls with comprehensive wiring and cabling effort and expense.
In the 80s, the breakthrough occurred with the distributed process control systems. The control room was increasingly dominated by workstations equipped with monitors.
In the 90s, the first process automation bus systems were conceived and the control systems were equipped with new interfaces. The initial developments and use of remote I/O systems can be traced back to this time. Thus, the distributed structure was extended into the field. Distributed I/O systems are the connecting elements between the sensor/actuator levels and the higher- level process control system.
Profibus DP has established itself as the interface between the process control system and remote I/O. The explosion-hazardous area has become apparent as the main area of application of remote I/O systems in the field of process automation.
Status Quo
The remote I/O system excom® from TURCK has proven itself in the process industry and its high level of demands with regard to safety and availability of systems.
excom® is a remote I/O system for use in explosion hazardous areas. It comprises bus-compatible remote input and output modules for connection of binary and analogue intrinsically safe field devices. The specific Ex-approval of the system permits use in zones 1 and 2. The field circuits are approved for zone 0...
The Author:
Dipl.-Ing. Tim-Peter Henrichs,
Productmanager Fieldbustechnology,
Hans Turck GmbH & Co. KG, Mülheim an der Ruhr
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