Diagnostics; Error Response; Table 63: Prioritylevels Of Diagnostic Functions; Table 64: Behavior In The Event Of An Error Dependent On The Configuration - WAGO 750-451 Manual

88

Diagnostics

8 Diagnostics
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 63: PriorityLevels of Diagnostic Functions

Priority level
High
High
Medium
Medium
Low
Low

Table 64: Behavior in the Event of an Error Dependent on the Configuration

Wire break/
short circuit
monitoring
OFF
OFF
Manual
Version 1.2.0
Diagnostic function
Wire break
Short circuit
Underrange
Overrange
User limiting value underrange
User limiting value overrange
Configuration
Underrange /
overrange
monitoring
OFF
ON
Behavior for
range violation
Process value is saturated,
no change in status byte,
error LED OFF
Process value is saturated,
error bit (bit 0: Underrange or
bit 1: Overrange),
general error (Err_G) (bit 6) is
set,
error LED ON
WAGO-I/O-SYSTEM 750
750-451 8 AI RTD
Behavior for
wire break /
short circuit
Process value is saturated,
no change in status byte,
error LED OFF
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