Interrupts - Siemens 181 Workshop Manual

5.2

Interrupts

Evaluating hardware interrupts with IO controller
The module generates a hardware interrupt at the following events:
● Violation of low limit 1
● Violation of high limit 1
● Violation of low limit 2
● Violation of high limit 2
You can obtain detailed information on the event in the hardware interrupt organization block with
the "RALARM" (read additional interrupt information) instruction and in the STEP 7 online help.
The module channel that triggered the hardware interrupt is entered in the start information
of the organization block. 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 the additional interrupt information
Data block name
USI
(User Structure Identifier)
Channel that triggered the hardware interrupt.
Channel
Event that triggered the hardware interrupt.
Event
Analog input module AI 4xRTD/TC 2-/3-/4-wire HF (6ES7134-6JD00-0CA1)
Manual, 02/2014, A5E03573289-AD
OB start information
Content
W#16#0001
B#16#00 to B#16#03
B#16#03
B#16#04
B#16#05
B#16#06
Comment
additional interrupt information for hardware
interrupts of the I/O module
Channel 0 to 3 of the I/O module
Violation of low limit 1
Violation of high limit 1
Violation of low limit 2
Violation of high limit 2
Interrupts/diagnostics alarms
5.2 Interrupts
Bytes
2
1
1
37