WAGO-I/O-SYSTEM 750
Commissioning 107
750-666/000-003 4FDI/2FDO 24V/10A PROFIsafe V2 iPar
Manual
Version 1.2.0, valid from HW/SW Version 01/01
Behavior of the PROFIsafe I/O module after expiration of the discrepancy
time
If the invalid input signal status is detected by the PROFIsafe I/O module longer
than the configured discrepancy time, there is a discrepancy error, the PROFIsafe
I/O module is passivated and the "Discrepancy time exceeded" diagnostic
message is output to the safe PLC. The discrepancy error can be caused, for
example, by a wire break on a signal line, a sensor error, etc.
Behavior of the PROFIsafe I/O module during discrepancy time errors
If the a discrepancy error is detected by the PROFIsafe I/O module, all digital
inputs and power outputs are passivated by the PROFIsafe I/O module.
Depending on the
Restart inhibit
parameter setting, you can acknowledge the
reported 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+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: