Triggering Of A Diagnostic Interrupt; Triggering Of A Hardware Interrupt - Siemens SIMATIC ET 200MP Manual

Interrupts and diagnostic, error, and system alarms
5.2 Interrupts
5.2.1

Triggering of a diagnostic interrupt

Triggering of a diagnostic interrupt
For an incoming or outgoing event (e.g., wire break on a channel of an I/O module), the
module triggers a diagnostic interrupt if this is configured accordingly in STEP 7 (TIA Portal).
The CPU interrupts user program execution and executes the diagnostic interrupt OB. The
event that triggered the interrupt is entered in the start information of the diagnostic interrupt
OB.
5.2.2

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.
Note
Diagnostics "Hardware interrupt lost" (from I/O module)
Avoid creating hardware interrupts cyclically.
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.
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IM 155-5 PN ST interface module (6ES7155-5AA00-0AB0)
Manual, 08/2013, A5E03612323-02