Triggering A Hardware Interrupt; Triggering A Swapping Interrupt; Triggering Of A Maintenance Event - Siemens SIMATIC ET 200SP Equipment Manual

Interrupts, diagnostics, error, and system messages
6.2 Interrupts
6.2.2

Triggering a hardware interrupt

Triggering a hardware interrupt
During a hardware interrupt, the CPU interrupts the processing of the user program and
processes the hardware interrupt block, e.g. OB 40. The event that triggered the interrupt is
entered in the start information of the hardware interrupt block.
Note
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 a swapping interrupt

Triggering a swapping interrupt
In the event of a remove/insert interrupt, the CPU interrupts processing of the user program
and processes the diagnostic block OB 83. The event which led to the interrupt is entered in
the start information of the OB 83.
Note
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 OB83.
After inserting a module, OB83 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.
6.2.4

Triggering of a maintenance event

Triggering of a maintenance event
The PROFINET IO interfaces of the interface module support the diagnostic concept and
maintenance concept in PROFINET IO according to the IEC 61158 Type 10 standard. The goal
is to detect and remove potential problems as early as possible.
For the interface module, maintenance events signal to the user when a plant component
must be checked or replaced.
The CPU interrupts the processing of the user program and processes the diagnostic interrupt
OB (OB 82). The event that triggered the maintenance event is entered in the start
information of the diagnostic interrupt OB.
40
IM 155-6 PN ST Interface Module (6ES7155-6AU02-0BN0)
Equipment Manual, 11/2023, A5E53132379-AA