Parameter Discrepancy Time Ix & Ix+1 - WAGO -I/O-SYSTEM 750 Series Manual

WAGO-I/O-SYSTEM 750
753-661/000-003 4FDI 24V PROFIsafe V2 iPar
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8.3.4.4 Parameter Discrepancy Time Ix & Ix+1
Do not use discrepancy time monitoring as part of the safety function!
You may only use discrepancy monitoring for safety applications where
monitoring of both contacts does not represent its own safety function, such as
emergency Off and, in contrast to this, two-hand control!
The discrepancy time parameter is used for two-channel analysis of two digital
inputs Ix & Ix+1. The discrepancy time is then only used by the PROFIsafe I/O
module when the operating mode is set to "Standard" and the value of the two-
channel analysis parameter is set to "yes".
If you have set the two-channel analysis parameter to "yes", the signal states of
the affected input pair are evaluated based on an variable valence rule. The
valence rule (antivalence, equivalence) depends on the value of the valence
analysis parameter (see Section "Valence Analysis Ix & Ix+1 Parameter").
The PROFIsafe I/O module checks whether the deviation from the valence rule
has disappeared after the configured discrepancy time has elapsed. In not, 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.
Use the value of the parameter to specify the maximum permissible time for a
deviation (invalid signal state) of both input signal states of the valence rule.
The PROFIsafe I/O module begins discrepancy monitoring as soon as a deviation
of the input signal states from the valence rule is detected.
Discrepancy time monitoring is terminated when a valid signal status is achieved
(0-signal or 1-signal, see Section "Valence Analysis Ix & Ix+1 Parameter"),
depending on the signal status that was present at the digital inputs prior to the
beginning of discrepancy monitoring.
You can set the discrepancy time in a value range from 10 ms to 65535 ms for
each input pair separately.
Discrepancy Time Monitoring and Discrepancy Time
If you use a two-channel or two single-channel sensors that capture the same
physical process variable, changing of the input signals of the connected digital
inputs, for example due to mechanical properties or dimensional tolerances, will
be delayed.
Discrepancy time monitoring of the two-channel analysis is used to determine
sensor errors based on the chronological progression of the signal states.
Discrepancy time monitoring is activated if the signal states deviate from the
valence rule when
• No equivalent (same) states are detected with an equivalent valence rule
Manual
Version 1.4.0, valid from HW/SW Version 01/02
Commissioning 85