Interrupts and diagnostic, error, and system alarms
6.2 Interrupts
Interface module IM 155-5 MF HF (6ES7155-5MU00-0CN0)
50 Equipment Manual, 11/2023, A5E53268530-AA
6.2.2 Triggering of a hardware interrupt
Triggering of a hardware interrupt
When a hardware interrupt occurs, the CPU interrupts execution of the user program and
processes the hardware interrupt OB. The event that triggered the interrupt is entered in the
start information of the hardware interrupt OB.
Diagnostics "Hardware interrupt lost" (from I/O module)
Do not use hardware interrupts for functional purposes (e.g. cyclic generation of hardware
interrupts).
If the hardware interrupt load is too high, hardware interrupts can get lost depending on the
number of I/O modules and the communication load.
6.2.3 Triggering of a pull/plug interrupt
Triggering of a pull/plug interrupt
In the event of a pull/plug interrupt, the CPU interrupts processing of the user program and
processes the pull/plug OB (OB 83). The event that triggered the interrupt is entered in the
start information of the pull/plug OB.
Parameter assignment error after removal/insertion
If you write data records from the user program to the modules of the distributed I/O, make
sure that these modules actually exist and are available. You can do this by evaluating OB 83.
After inserting a module, OB 83 is not called until the module has started up and its
parameters are assigned. This ensures that data record operations can be executed without
errors.
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