ABB AC500-S Safety User Manual page 272

Safety programmable logic controllers system

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Configuration and programming

AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib

Fig. 98: Typical Timing Diagram for SF_Equivalent

The function block monitors the discrepancy time between Channel A and B, when switching to TRUE and

also when switching to FALSE.

Error Behavior

S_EquivalentOut is set to FALSE. Error is set to TRUE. DiagCode indicates the Error states. There is no

Reset defined as an input coupled with the reset of an error. If an error occurs in the inputs, a new set of

inputs with correct S_EquivalentOut must be able to reset the error flag. (Example: if a switch is faulty and

replaced, using the switch again results in a correct output.)

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