Siemens SIMATIC ET 200SP Manual page 35

Diagnostic alarm Error
code
Faulty external 110
auxiliary voltage
Illegal A/B signal 500
ratio
Wire break at 505
digital input A, B
or N
Overheating 506
Technology Module TM Count 1x24V (6ES7138‑6AA00‑0BA0)
Manual, 10/2013, A5E33002339-AA
Meaning
Error at supply voltage L+
•
H
Possible causes:
•
– Low voltage
– Wiring of L+ supply voltage defective
Time profile of signals A and B of the
•
H
incremental encoder does not meet certain
specifications
Possible causes:
•
– Signal frequency too high
– Encoder faulty
– Process wiring faulty
Channel not connected
H
Resistance of encoder circuit too high
Interruption of the line between technology
module and encoder
Sensor used is sourcing output or sinking output
only
Possible causes:
H
Short circuit or overload at the digital outputs
•
or output of the encoder supply
Ambient temperature outside specifications
•
Interrupts/diagnostic messages
5.2 Diagnostic messages
To correct or avoid errors
Check the L+ supply voltage
•
Check the wiring of the supply voltage
•
L+ on the BaseUnit
Check process wiring
•
Check encoder/sensor
•
Check parameter assignment
•
Connect the channel
Use a different encoder type or modify
•
the wiring, for example, use shorter
cables with larger cross-sections
Check encoders
•
Check process wiring
Correct parameter assignment
Check process wiring
•
Improve cooling
•
Check connected loads
•
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