Interrupts; Diagnostics Alarms - Siemens SIMATIC S7-1500 Manual

Interrupts/diagnostics alarms

5.2 Interrupts

5.2 Interrupts
Digital output module DQ 8x230VAC/5A ST supports diagnostic interrupts.
Diagnostic interrupt
The module generates a diagnostic interrupt at the following event:
● Missing supply voltage L+
For more information on the error event, refer to the error OB with the "RALRM" instruction
(read additional interrupt info) and to the STEP 7 Online Help.
5.3

Diagnostics alarms

Diagnostics alarms
A diagnostics alarm is output for each diagnostics event and the ERROR LED flashes on the
module. The diagnostics alarms can, for example, be read from the diagnostics buffer of the
CPU. You can evaluate the error codes with the user program.
If the module is operated distributed with PROFIBUS DP in an ET 200MP system, you have
the option to read out diagnostics data with the instruction RDREC or RD_REC using data
record 0 and 1. The structure of the data records is available on the Internet in the "Manual
for interface module IM 155-5 DP ST (6ES7155-5BA00-0AB0)".
Table 5- 4 Diagnostics alarms, their meaning and corrective measures
Diagnostics alarm
Load voltage missing
20
Error code Meaning
11 Supply voltage L+ of the module is
H
missing
Corrective measures
Connect supply voltage L+ to mod-
ule/channel
DQ 8x230VAC/5A ST Digital Output Module (6ES7522-5HF00-0AB0)
Manual, 07/2014, A5E03485590-AC