WAGO-I/O-SYSTEM 750 Commissioning 107750-666/000-003 4FDI/2FDO 24V/10A PROFIsafe V2 iParManualVersion 1.2.0, valid from HW/SW Version 01/01Behavior of the PROFIsafe I/O module after expiration of the discrepancytimeIf the invalid input signal status is detected by the PROFIsafe I/O module longerthan the configured discrepancy time, there is a discrepancy error, the PROFIsafeI/O module is passivated and the "Discrepancy time exceeded" diagnosticmessage is output to the safe PLC. The discrepancy error can be caused, forexample, by a wire break on a signal line, a sensor error, etc.Behavior of the PROFIsafe I/O module during discrepancy time errorsIf the a discrepancy error is detected by the PROFIsafe I/O module, all digitalinputs and power outputs are passivated by the PROFIsafe I/O module.Depending on the Restart inhibit parameter setting, you can acknowledge thereported error(s) with or without eliminating the cause of the error (see section"Parameter Restart Inhibit Ix & Ix+1").7.4.5.5 Parameter Valence Evaluation Ix & Ix+1The Valence evaluation parameter is used for the dual channel evaluation of twodigital inputs Ix & Ix+1. The valence evaluation is then only used by thePROFIsafe I/O module if you have set the value of the Operating modeparameter to "Standard" and the value of the Dual channel evaluation parameterto "yes".The Valence evaluation parameter is used to set the valence rule of the dualchannel evaluation to be used for an input pair. You can set the parameter to"Antivalent" or "Equivalent". The valence evaluation can be set separately foreach input pair.Changing input signals caused by interferenceChanging input signals caused by interference can cause the PFOFIsafe I/Omodule to transmit the value "0" to the safe PLC in the process image for theinput pair affected, a discrepancy error to be detected after the discrepancy timehas elapsed and the "Discrepancy time exceeded" diagnostic message to beoutput.Possible causes may be:• Cross circuit, short circuit and broken cable (user error,wiring error)• Sticky normally open contacts of a reliable sensor• Inadequate filtering of the test signals of a reliable sensorIf you have set the Valence evaluation parameter to "Antivalent", then thePROFIsafe I/O module behaves as follows:
