Diagnostics Alarms - Siemens simatic s7-1500 User Manual
Analog input module ai 8xu/r/rtd/tc hf
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5.3
Diagnostics alarms
A diagnostics alarm is generated and the ERROR LED flashes for each diagnostics event on
the module. 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 on the Internet in the "Manual
for interface module IM 155-5 DP ST (6ES7155-5BA00-0AB0)".
Table 5- 5
Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Wire break
Overflow
Underflow
Parameter assignment
error
Load voltage missing
Reference channel
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 previous
"Wire break" diagnostics and aborts after this error message. The "Underflow" diagnostics is
not detected.
Recommendation: To ensure that all errors are subjected to the diagnostics, select all check
boxes under "Diagnostics".
Analog Input Module AI 8xU/R/RTD/TC HF (6ES7531-7PF00-0AB0)
Manual, 09/2016, A5E36647959-AB
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.
•
11
Supply voltage L+ of the module is
H
missing
15
Invalid reference temperature for the
H
used TC channel with compensation
Interrupts/diagnostics alarms
5.3 Diagnostics alarms
Remedy
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
Connect supply voltage L+ to module
Check compensation with reference
channel parameterization or thermoresis-
tor. Check communication to the mod-
ule/station for the compensation with data
record.
45
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