Siemens SIMATIC ET 200AL System Manual page 326

Interrupts, error messages, diagnostics and system alarms
5.2 Interrupts
5.2 Interrupts
5.2.1 Evaluating interrupts
Introduction
Interrupts are triggered by the IO device in case of errors. Interrupts are evaluated based on
the I/O controller used.
Evaluating interrupts with I/O controllers
The ET 200AL distributed I/O system supports the following interrupts:
• Diagnostics interrupts
• Hardware interrupts
• Pull/plug module interrupt
In the event of an interrupt, interrupt OBs are automatically called in the CPU of the IO
controller.
Information on the cause and class of the error is already available, based on the OB number
and start information.
Detailed information on the error event can be obtained in the error OB using the instruction
"RALRM" (read additional interrupt information).
System diagnostics
In STEP 7 (TIA Portal), the updated system diagnostic is available for the modules of the
S7-1500 automation system (IO controller CPU S7-1500) and ET 200AL (IO device).
Independent of the cyclic user program, messages are made available on the display of the
CPU S7-1500, the CPU web server and the HMI device.
You will find more information on systemic diagnostics in the Function Manual Diagnostics
(http://support.automation.siemens.com/WW/view/en/59192926).
5.2.2 Trigger a diagnostics interrupt
For an incoming or outgoing event (for example, wire break on a channel of an I/O module),
the interface module triggers a diagnostics interrupt if the parameters were assigned
accordingly.
The CPU interrupts the processing of the user program and processes the diagnostics
interrupt OB (OB 82). The event that triggered the interrupt is entered in the start
information of the diagnostics interrupt OB.
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IM 157-1 PN (6ES7157-1AB00-0AB0)
Equipment Manual, 05/2021, A5E32347036-AE