Control system

Abstract

Control system for controlling safety-critical processes with communication over a field bus. The inventive system has the control unit integrated in the interface module, i.e. the multi-port memory interface of the bus master. Thus it is not directly connected to the field bus and can insert fail-safe data without a security protocol relevant interpretation in the field bus frames prior to transfer of the data to the signal unit.

Description

technical field [0001] The present invention relates generally to a control system for controlling a critical safety process, and more particularly to a control system communicating via a fieldbus. Background technique [0002] Fieldbus systems, which are connected to input / output devices and advanced control devices, have been applied more and more frequently in the field of automatic control for many years. An example of this is the bypass bus based on the EN 50254 standard. [0003] Such a fieldbus system typically includes a plurality of signal units or multiple bus users connected to the process to be controlled, and a bus master controlling frame-based communications via the fieldbus using "fieldbus messages". ). [0004] Fieldbus systems allow for a significant reduction in the complexity of cabling due to the saving of copper wires. However, designing a serial field communication system encounters problems related to security requirements. Such a relevant safety ...

AI Technical Summary

Problems solved by technology

This communication is only possible when the fieldbus is activated, which is disadvantageous

[0014] Moreover, the transmission via fieldbus is rather slow, and even with diagnostic options, it is not available with very large limitations

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