Parameter Valence Evaluation Ix & Ix+1; Table 35: Antivalent Evaluation - WAGO -I/O-SYSTEM 750 Series Manual

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8.3.4.5 Parameter Valence Evaluation Ix & Ix+1
The Valence evaluation parameter is used for the dual channel evaluation of two
digital inputs Ix & Ix+1. The valence evaluation is then only used by the
PROFIsafe I/O module if you have set the value of the Operating mode
parameter to "Standard" and the value of the Dual channel evaluation parameter
to "yes".
The Valence evaluation parameter is used to set the valence rule of the dual
channel evaluation to be used for an input pair. You can set the parameter to
"Antivalent" or "Equivalent". The valence evaluation can be set separately for
each input pair.
Changing input signals caused by interference
Changing input signals caused by interference can cause the PFOFIsafe I/O
module to transmit the value "0" to the safe PLC in the process image for the
input pair affected, a discrepancy error to be detected after the discrepancy time
has elapsed and the "Discrepancy time exceeded" diagnostic message to be
output.
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 sensor
If you have set the Valence evaluation parameter to "Antivalent", then the
PROFIsafe I/O module behaves as follows:
The PROFIsafe I/O module compares the signal states of the digital inputs
affected to the opposing values. The following table shows the possible signal
states for the antivalent evaluation:

Table 35: Antivalent Evaluation

I2
I4
0
0
1
1
After the set discrepancy time has elapsed, an illegal signal state leads to the
detection of a discrepancy error by which the PROFIsafe I/O module is passivated
and the "Discrepancy time exceeded" diagnostic message is output.
If you have set the Valence evaluation parameter to "Equivalent", then the
PROFIsafe I/O module behaves as follows:
Inputs
I1
I3
0
1
0
1
WAGO-I/O-SYSTEM 750
753-661/000-003 4FDI 24V PROFIsafe V2 iPar
Process Image
Bit 1 Bit 0
Bit 3 Bit 2
0 0
0 1
0 0
0 0
Version 1.4.0, valid from HW/SW Version 01/02
Signal State
Illegal
1 Signal
0 Signal
Illegal
Manual