Siemens Simatic S7-1500 Manual page 126

Interrupts/diagnostics alarms
6.2 Interrupts and diagnostics
Hardware interrupt
The compact CPU can generate a hardware interrupt for the following events:
● Rising edge
● Falling edge
You will find detailed information on the event in the hardware interrupt organization block
with the "RALRM" (read additional interrupt information) instruction and in the STEP 7 online
help.
The start information of the organization block includes information on which channel
triggered the hardware interrupt. The figure below shows the assignment to the bits of
double word 8 in local data.
Figure 6-5
Structure of the additional interrupt information
Table 6- 13 Structure of USI = W#16#0001
Data block name
USI
(User Structure Identifier)
The channel that triggered the hardware interrupt follows.
Channel
The error event that triggered the hardware interrupt follows.
Event
126
Start information of the organization block
Contents
W#16#0001
B#16#00 to B#16#0F
B#16#01
B#16#02
Comment
Additional interrupt information of the hardware
interrupts of the digital on-board I/O
Number of the event-triggering channel (chan-
nel 0 to channel 15)
Rising edge
Falling edge
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Bytes
2
1
1
Manual, 09/2016, A5E35306440-AB