DiagCode State Name State Description and Output Setting
8014 Wait for
Channel A
Channel B has been switched to TRUE - waiting for Channel A; discrep-
ancy timer started.
Ready = TRUE
S_EquivalentOut = FALSE
Error = FALSE
8005 From Active
Wait
One channel has been switched to FALSE; waiting for the second channel
to be switched to FALSE, discrepancy timer started.
Ready = TRUE
S_EquivalentOut = FALSE
Error = FALSE
4.6.6.3 SF_Antivalent
Standards Requirements
EN 954-1: 1996 6.2 General safety principles, Idle current
6.2 Error detection for category 3 und 4
This function block converts two antivalent BOOL inputs (NO/NC pair) to one BOOL output with discrepancy
time monitoring. This FB should not be used stand-alone since it has no restart interlock. It is required to
connect the output to other safety related functionalities.
Configuration and programming
AC500-S Libraries > SafetyBlocks_PLCopen_AC500_v22.lib
30.03.2017AC500-S274
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