Siemens SIMATIC ET 200AL System Manual page 534

4.1.3.3 Diagnostics alarms
For each diagnostic event, a diagnostics alarm is issued and the LED DIAG flashes red on the
digital input/digital output module.
You can read out the diagnostics alarms, for example, from the diagnostics buffer of the CPU.
You can evaluate the error codes with the user program.
Table 4- 15
Diagnostics alarm Error code
Short circuit
Parameter as-
signment error
Load voltage 2L+
missing
Hardware inter-
rupt lost
If a short-circuit of the encoder supply to ground is detected, the diagnostic alarm "Short-circuit" is
1
always output. This alarm is output even if all channels are configured as outputs.
If you are using ET 200AL modules in connection with the ET 200SP distributed I/O system, the diag-
2
nostic alarm "Load voltage missing" is displayed.
Digital input/Digital output module DIQ 16x24VDC/0.5A 8xM12 (6ES7143-5AH00-0BA0)
Equipment Manual, 08/2021, A5E38688112-AD
Diagnostics alarms, their meanings and corrective measures
1
1
H
10
H
11
H
2
16
H
Meaning
Short-circuit of an encoder sup-
ply to ground
Short-circuit of an output to
ground
Module parameter assignment is
faulty
Load voltage 2L+ missing or too
low
At least one hardware interrupt
could not be signaled because
too many hardware interrupts
are pending.
4.1 Configuration method 2xCount
Solution
• Eliminate the short-circuit
Correction of the parameter
assignment
• Check the supply voltage
• Check the module
Correct the program or the pro-
cess
Counting
51