Interrupts/diagnostics alarms
6.2 Interrupts and diagnostics
CPU 1512C-1 PN (6ES7512-1CK01-0AB0)
138
Manual, 12/2017, A5E40898741-AA
6.2.3
Interrupts and diagnostics of the digital on-board I/O
Diagnostics interrupt
A diagnostics alarm is output for each diagnostics event and the ERROR LED flashes on the
digital on-board I/O. You can read out the diagnostics alarms, for example, in the diagnostics
buffer of the CPU. You can evaluate the error codes with the user program.
Table 6- 12 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Error code Meaning
Corrective measures
Load voltage missing 11
H
No supply voltage L+
Feed supply voltage L+
Hardware interrupt
lost
16
H
The digital on-board I/O cannot trigger an
interrupt because the previous interrupt
was not acknowledged; possibly a con-
figuration error
•
Change the interrupt processing in the
CPU and reconfigure the digital on-
board I/O.
Diagnostic interrupts when using high-speed counters
Table 6- 13 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Error code Meaning
Corrective measures
Illegal A/B signal
ratio
500
H
•
Time sequence of the A and B signals
of the incremental encoder do not
meet certain requirements.
•
Possible causes:
–
Signal frequency too high
–
Encoder is defective
–
Process wiring is incorrect
•
Correct the process wiring
•
Check the encoder/sensor
•
Check the parameter assignment.
Summary of Contents for Simatic S7-1500 CPU 1512C-1 PN
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