Programmable digital controller with master unit bus coupled to slave units - has built=in fault diagnostic facility that is used to activate emergency programme for safe operation.

摘要

The digital control system has central controllers (2) that communicate with a number of distributed units (4) over a bus system (5). Each central unit has a memory (3) and an interface (6) together with a fault diagnosis unit (12). Each central unit connects via a bus link. The distributed or slave units have built-in memory (10) and fault diagnosis unit (11), together with inputs (7) and outputs (8). In the event that the fault diagnosis facilities (11,12) detect failures in either the masters, slaves or bus systems, the emergency programme in memory is activated. ADVANTAGE - Activates emergency programme for safe operation.