Interrupts; Diagnostics Alarms - Siemens SIMATIC ET 200AL Manual

3.4.2

Interrupts

The digital input / digital output module DIQ 16x24VDC/0.5A 8xM12 in the configuration
method DIQ supports diagnostic interrupts.
Diagnostic interrupt
The digital input/digital output module generates a diagnostic interrupt at the following
events:
● Short-circuit of an encoder supply to ground, or
● Short-circuit of an output to ground
● Load voltage 2L+ missing or too low
● Parameter assignment error
3.4.3

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 3- 16
Diagnostics alarm
Short circuit
Parameter as-
signment error
Load voltage 2L+
missing
= If a short-circuit of an 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
2
diagnostic alarm "Load voltage missing" is displayed.
Note
Channel type
The digital input/digital output module is always signaled as a mixed module (channel type
"Input/Output") in the case of diagnostic events, even if you have configured the digital
input/digital output module exclusively as an output or input module.
Digital input/Digital output module DIQ 16x24VDC/0.5A 8xM12 (6ES7143-5AH00-0BA0)
Manual, 03/2019, A5E38688112-AC
Diagnostics alarms, their meanings and corrective measures
Error code
1
1
H
10
H
11
H
2
Configuration modes for digital inputs/outputs
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
3.4 Interrupts/diagnostic alarms
Solution
Eliminate the short-circuit
•
Correction of the parameter
assignment
Check the supply voltage
•
Check the module
•
29