Interrupts And Diagnostics Of The Digital On-Board I/O - Siemens Simatic S7-1500 Manual

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- 11 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm Error code
Load voltage missing 11
Hardware interrupt 16
lost
Diagnostic interrupts when using high-speed counters
Table 6- 12 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm Error code
Illegal A/B signal 500
ratio
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB
Meaning
No supply voltage L+
H
The digital on-board I/O cannot trigger an
H
interrupt because the previous interrupt
was not acknowledged; possibly a con-
figuration error
Meaning
Time sequence of the A and B signals
•
H
of the incremental encoder do not
meet certain requirements.
Possible causes:
•
– Signal frequency too high
– Encoder is defective
– Process wiring is incorrect
Interrupts/diagnostics alarms
6.2 Interrupts and diagnostics
Corrective measures
Feed supply voltage L+
Change the interrupt processing in the
•
CPU and reconfigure the digital on-
board I/O.
The error persists until new parame-
•
ters are set for the digital on-board I/O
Corrective measures
Correct the process wiring
•
Check the encoder/sensor
•
Check the parameter assignment.
•
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