Siemens SIMATIC S7-1500 Manual page 31

Interrupts/diagnostics alarms
5.2 Interrupts
Reaction when reaching limits 1 and 2 at the same time
If the two high limits 1 and 2 are reached at the same time, the module always signals the
hardware interrupt for high limit 1 first. The configured value for high limit 2 is irrelevant. After
processing the hardware interrupt for high limit 1, the module triggers the hardware interrupt
for high limit 2.
The module has the same reaction when the low limits are reached at the same time. If the
two low limits 1 and 2 are reached at the same time, the module always signals the
hardware interrupt for low limit 1 first. After processing the hardware interrupt for low limit 1,
the module triggers the hardware interrupt for low limit 2.
Structure of the additional interrupt information
Table 5- 4 Structure of USI = W#16#0001
Data block name
USI
(User Structure Identifier)
The channel that triggered the hardware interrupt follows.
Channel
It follows the error event that triggered the hardware interrupt.
Event
30
Contents
W#16#0001
B#16#00 to B#16#n
B#16#03
B#16#04
B#16#05
B#16#06
Remark
Additional interrupt info for hardware interrupts
of the I/O module
Number of the event-triggering channel (n =
number of module channels -1)
Low limit violated 1
High limit violated 1
Low limit violated 2
Violation of high limit 2
Analog Input Module AI 8xU/I HS (6ES7531-7NF10-0AB0)
Bytes
2
1
1
Manual, 07/2014, A5E03484886-AC