Siemens SIMATIC ET 200SP Manual page 30

S7-300/400 or a different CPU
You can obtain detailed information on the event in the hardware interrupt organization block
with the instruction "RALARM" (read additional interrupt info) and in the STEP 7 online help.
The channel of the module that triggered the hardware interrupt is entered in the start
information of OB4x in the OB4x_POINT_ADDR tag. The following figure shows the
assignment to the bits of double word 8 in local data.
Figure 5-2
Structure of the additional interrupt information
Table 5- 4 Structure of USI = W#16#0001
Data block name
USI
The channel that triggered the hardware interrupt follows.
Channel
The error event that triggered the hardware interrupt follows.
Error event
Analog input module AI 2xU/I 2-/4-wire HS (6ES7134-6HB00-0DA1)
Manual, 09/2018, A5E03576060-AF
OB4x_POINT_ADDR tag
Content
W#16#0001
B#16#00 to B#16#01
B#16#03
B#16#04
B#16#05
B#16#06
Interrupts/diagnostics interrupts
Comment
User Structure Identifier: Additional interrupt
info for hardware interrupts of the I/O module
Channel 0 and 1 of the I/O module
Low limit 1 violated
High limit 1 violated
Low limit 2 violated
High limit 2 violated
5.2 Interrupts
Bytes
2
1
1
29