Siemens SIMATIC ET 200M Operating Instructions Manual page 223

9.2.3 Evaluating the interrupts of the ET 200M
Introduction
The I/O device initiates interrupts when certain errors occur. The interrupt evaluation is
dependent on the utilized I/O controller.
Evaluating interrupts with I/O controller
The ET 200M supports the following interrupts:
● Diagnostic interrupts
● Hardware interrupts
● Removal / insertion interrupts
● Maintenance interrupts
In the event of an interrupt, interrupt OBs are executed automatically in the CPU of the IO
controller (refer to the "SIMATIC software, programming with STEP 7 V5.x.
(http://support.automation.siemens.com/WW/view/en/18652056)" manual).
Information on the cause and class of the error is already available based on the OB number
and start information.
To obtain detailed information about the error event, call the error OB using
SFB 54 "RALRM" (read additional interrupt information).
Triggering of a diagnostics interrupt
In case of an incoming or outgoing event (for example, a wire break), the module triggers a
diagnostics interrupt if "Enable: Diagnostics interrupt" is set.
The CPU interrupts processing of the user program and executes the OB 82 diagnostic block
instead. The event that triggered the interrupt is entered in the OB 82 start information.
Triggering a hardware interrupt
If a hardware interrupt occurs, the CPU interrupts the user program execution and executes
hardware interrupt block OB 40. The event that triggered the interrupt is entered into the
OB 40 start information.
Note
Hardware interrupts should not be used for technological purposes (cyclic generation of
hardware interrupts, for example), because these can become lost in the entire system.
Triggering a removal / insertion interrupt
The CPU interrupts processing of the user program and processes the OB 83 diagnostic
block instead. The event that triggered the interrupt is entered in the OB 83 start information.
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
Interrupt, error and system messages
9.2 PROFINET IO
221