Triggering Of A Hardware Interrupt - Siemens SIMATIC ET 200SP Manual

Interrupts/diagnostic messages
5.3 Interrupts
5.3.3

Triggering of a Hardware Interrupt

Introduction
For the technology module, you can configure which events are to trigger a hardware
interrupt during operation.
What is a Hardware Interrupt?
The technology module will trigger a hardware interrupt as configured in response to specific
events/states. When a hardware interrupt occurs, the CPU interrupts execution of the user
program and processes the assigned hardware interrupt OB. The event that triggered the
interrupt is entered in the start information of the assigned hardware interrupt OB by the
CPU.
Activating the hardware interrupts
You activate the hardware interrupts in STEP 7 (TIA Portal) under "Basic parameters >
Hardware interrupts" during device configuration of the technology module.
A list of the individual hardware interrupts is available at Events which can trigger a hardware
interrupt (Page 49).
Lost hardware interrupt
If an event occurs which is supposed to trigger a hardware interrupt but there is an identical,
previous event which has not yet been processed, no further hardware interrupt will be
triggered. The hardware interrupt is lost. This may lead to the "Hardware interrupt lost"
diagnostic interrupt, depending on the parameter assignment.
Default setting
No hardware interrupts are activated in the default setting.
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Technology module TM PosInput 1 (6ES7138-6BA00-0BA0)
Manual, 02/2014, A5E33015755-AA