Diagnostics Alarms - Siemens SIMATIC S7-1500/ET 200MP Manual

5.3

Diagnostics alarms

A diagnostics alarm is generated and the ERROR LED flashes on the module for each
diagnostics event. The diagnostics alarms can be read out in the diagnostics buffer of the
CPU, for example. You can evaluate the error codes with the user program.
If the module is operated distributed with PROFIBUS DP in an ET 200MP system, you have the
option to read out diagnostics data with the instruction RDREC or RD_REC using data record 0
and 1. The structure of the data records is available in the "Manual for interface module IM
155-5 DP ST (6ES7155-5BA00-0AB0)" on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/78324181).
Table 5- 4 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Wire break
Overflow
Underflow
Parameter assignment
error
Common mode error
Diagnostics alarms with value status (QI)
If you configure the module with value status (QI), the module always checks all errors even
if the respective diagnostics is not enabled. But the module cancels the inspection as soon as
it detects the first error, regardless if the respective diagnostics has been enabled or not. The
result may be that enabled diagnostics may not be displayed.
Example: You have enabled "Underflow" diagnostics, but the module detects the "Wire break"
diagnostics first and aborts after this error message. The "Underflow" diagnostics is not
detected.
Recommendation: To ensure that all errors can be diagnosed reliably, select all check boxes
under "Diagnostics".
Analog input module AI 16xU BA (6ES7531-7LH00-0AB0)
Equipment Manual, 09/2020, A5E47052556-AA
Error code Meaning
6 Impedance of encoder circuit too
H
high
Wire break between the module and
sensor
Channel not connected (open)
7 Measuring range violated
H
8 Measuring range violated
H
10
• The module cannot evaluate
H
parameters for the channel
• Incorrect parameter assignment
118 Valid common mode voltage ex-
H
ceeded
Interrupts/diagnostics alarms
5.3 Diagnostics alarms
Solution
Use a different encoder type or modify the
wiring, for example, using cables with
larger cross-section
Connect the cable
• Disable diagnostics
• Connect the channel
Check the measuring range
Check the measuring range
Correct the parameter assignment
Check the wiring, e.g. sensor ground
connections, use equipotential cables
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