Safety System

The ProSafe-PLC Safety System consists of a range of plug-in modules, that includes critical control modules and critical I/O modules. In its various architectures these safety system devices co-operate in a selective and flexible manner.

This safety system incorporates two separate circuit paths. In standard dual architecture it provides guarded outputs. Diversity applied in the dual signal paths has created the 1oo1D structure. The architecture denomination 'D' reflects the self diagnostic capability 'by reference', implemented in each channel and the secondary shutdown path, controlled by this self-diagnostic.

In order to create full fault-tolerance, the basic 1oo1D structure is used in redundancy, combined with comparison between controllers in the ProSafe-PLC, 1oo2D quadruple architecture. At the detection of a first critical failure, the system goes in the 1oo1D mode and there is no shut-down. An on-line repair can be executed to restore the 1oo2D structure. This ProSafe-PLC structure minimises the amount of hardware required, while providing a parallel combination of protected outputs.

N/A, 2 Dart Road, Newnan, GA 30265. Tel: 770-253-7000; Fax: 770-254-0928.