Diagnostics Alarms - Siemens S7-1500 Manual
Digital input module
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Also See for S7-1500:
- System manual (523 pages) ,
- Function manual (402 pages) ,
- Manual (188 pages)
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5.3
Diagnostics alarms
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- 4
Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Error
code
Wire break
6
H
Parameter as-
10
H
signment error
Hardware interrupt
16
H
lost
Digital input module DI 16x24...125VUC HF (6ES7521-7EH00-0AB0)
Manual, 12/2016, A5E35681478-AC
Meaning
Impedance of encoder circuit too high
Wire break between the module and
sensor
Channel not connected (open)
The module cannot evaluate pa-
•
rameters for the channel
Incorrect parameter assignment
•
The module cannot trigger an interrupt
because the previous interrupt was
not acknowledged; possibly a configu-
ration error
Interrupts/diagnostic alarms
Corrective measures
Use a different encoder type or modify the wiring,
for example, using cables with larger cross-section
Connect the cable
Disable diagnostics
•
Connect encoder contacts with resistor:
•
–
16 kΩ ... 21 kΩ with 1.0 W at 24 VUC
–
37 kΩ ... 53 kΩ with 0.5 W at 48 VUC
–
101 kΩ ... 156 kΩ with 0.25 W at 125 VUC
Correct the parameter assignment
Change interrupt processing in the CPU and edit
the module parameters if necessary (the error per-
sists until the module is assigned new parameters).
5.3 Diagnostics alarms
25
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