WAGO-I/O-SYSTEM 750
Diagnostics
91
750-451 8 AI RTD
Manual
Version 1.1.0
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8
Diagnostics
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8.1
Error Response
The behavior of the I/O module in the event of an error depends on the
configuration of the wire break / short circuit monitoring, underrange / overrange
monitoring and limiting value underrange / overrange monitoring. You can enable
or disable these diagnostics in register 35.
The I/O module always only allows one error to be displayed. One bit is assigned
to each fault condition in the status byte. If a fault condition is detected, the
respective status byte is set. For this reason, the fault conditions are prioritized. If
there are multiple errors, the error with the highest priority is displayed.
The following prioritization applies:
Table 69: PriorityLevels of Diagnostic Functions
Priority level Diagnostic function
High
Wire break
High
Short circuit
Medium
Underrange
Medium
Overrange
Low
User limiting value underrange
Low
User limiting value overrange
Table 70: Behavior in the Event of an Error Dependent on the Configuration
Configuration
Behavior for
range violation
Behavior for
wire break /
short circuit
Wire break/
short circuit
monitoring
Underrange /
overrange
monitoring
OFF
OFF
Process value is saturated,
no change in status byte,
error LED OFF
Process value is saturated,
no change in status byte,
error LED OFF
OFF
ON
Process value is saturated,
error bit (bit 0: Underrange
or bit 1: Overrange),
general error (Err_G) (bit 6)
is set,
error LED ON
Process value is saturated,
error bit (bit 0: Underrange
for short circuit or bit 1:
Overrange for wire break),
general error (Err_G) (bit 6)
is set,
error LED on