Diagnostics Alarms - Siemens 181 Workshop Manual

Interrupts/diagnostics alarms

5.3 Diagnostics alarms

Diagnostic error interrupt
The module generates a diagnostic error interrupt at the following events:
● Channel temporarily unavailable
● Hardware interrupt lost
● Reference channel error
● Error
● Violation of low limit
● Violation of high limit
● Wire break
● Supply voltage missing
● Parameter assignment error
5.3 Diagnostics alarms
A diagnostics alarm is output for each diagnostics event and the DIAG LED on the module
flashes. The diagnostics alarms can, for example, be read from the diagnostics buffer of the
CPU. You can evaluate the error codes with the user program.
Table 5- 5 Diagnostics alarms, their meaning and remedies
Diagnostics alarms
Channel temporarily
unavailable
Wire break
Violation of high limit
1
Violation of low limit
1
Error
38
Error code Meaning
1F Firmware update is being performed.
H
Channel 0 applies to the entire module.
The module is currently not performing
any measurements.
The channel is currently being calibrated.
6 Resistance of sensor circuit too high
H
Wire break between the module and
sensor
Channel not connected (open)
7 Value lies above the overrange.
H
Wire break
8 Value lies below the underrange.
H
9 Internal module error has occurred
H
(diagnostics alarm on channel 0 applies to
the entire module).
2
Analog input module AI 4xRTD/TC 2-/3-/4-wire HF (6ES7134-6JD00-0CA1)
Remedy
–
Use a different sensor type or modify
the wiring, for example, using cables
with larger cross-section
Connect the cable
Deactivate diagnostics
•
Connect or deactivate the channel
•
Correct module/sensor interplay
See Wire break
Correct module/sensor interplay
Replace module
Manual, 02/2014, A5E03573289-AD