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5.2
Interrupts
Introduction
The I/O device generates interrupts as a reaction to specific error events. Interrupts are
evaluated based on the I/O controller used.
Evaluating interrupts with I/O controllers
The ET 200SP distributed I/O system supports the following interrupts:
● Diagnostics interrupts
● Hardware interrupts
● Swapping interrupts
● Maintenance events
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 diagnostics is available for the devices of the
S7-1500 automation system (IO controller S7-1500 CPU) and ET 200SP (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 system diagnostics in the Diagnostics
(http://support.automation.siemens.com/WW/view/en/59192926) function manual.
5.2.1
Triggering of a diagnostics interrupt
Triggering of a diagnostics interrupt
For an incoming or outgoing event (e.g. wire break on a channel of an I/O module), the
module triggers a diagnostics interrupt if this is configured accordingly.
The CPU interrupts the user program and processes the diagnostics block OB 82. The
interrupt triggering event is logged in the start information of OB 82.
IM 155-6 PN ST interface module (6ES7155-6AU01-0BN0)
Manual, 04/2017, A5E03576904-AE
Interrupts, diagnostics, error, and system messages
5.2 Interrupts
33
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