ABB AC500-S Safety User Manual page 277

Safety programmable logic controllers system

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Configuration and programming

AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib

Fig. 99: Typical Timing Diagram for SF_Antivalent

The function block monitors the discrepancy time between Channel NO and Channel NC.

Error Behavior

The output S_AntivalentOut 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, one

new set of inputs with the correct value 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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