Hardware Interrupts - Siemens SIMATIC 6DL1131-6DF00-0PK0 Equipment Manual

Maintenance messages do not have a direct influence on the functions of the module or digital
inputs.
Maintenance Fault code
message
Retentive memo‐ 154
H
ry in carrier mod‐
ule defective
Retentive memo‐ 155
H
ry in the terminal
block defective
A.5

Hardware interrupts

Hardware interrupts
The DI 8x24...125VDC HA can trigger hardware interrupts on a signal change of digital inputs.
Interrupt OBs are called automatically if an interrupt occurs.
You can find detailed information on the event in the hardware interrupt organization block with
the "RALRM" instruction (read additional interrupt information).
Evaluate hardware interrupts of digital inputs
On occurrence of the following events the DI 8x24...125VDC HA generates a hardware interrupt
for digital input signals:
● At positive edge (change of signal from 0 to 1)
● At negative edge (change of signal from 1 to 0)
The module digital input (channel) that has triggered the hardware interrupt is entered in
variable OB40_POINT_ADDR in the start information of OB40. The figure below shows the
assignment to the bits of local data double word 8.
DI 8x24...125VDC HA
Equipment Manual, 10/2021, A5E39288633-AD
Assignment Meaning / Cause
Module Fault detected in the data block on the
carrier module during operation
Module A memory block fault on the terminal
block was detected during operation
Parameters, diagnostics messages and address space
A.5 Hardware interrupts
Solution
Replace carrier module
Replace terminal block
39