Interrupts/diagnostics alarms
6.2 Interrupts and diagnostics
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB
125
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
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.
• The error persists until new parame-
ters are set for the digital on-board I/O
Diagnostic interrupts when using high-speed counters
Table 6- 12 Diagnostics alarms, their meaning and 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.
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