Commissioning and Diagnostics
6-65
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
6.2.5 Evaluating the interrupts o f the ET 200S
Introduction
Interrupts are triggered by the I/O device in the event of specific errors occurring.
Interrupt evaluation differs depending on the I/O controller used.
Evaluate interrupt with I/O controller
The ET 200S supports the following interrupts:
• Diagnostics Interrupts
• Process Alarms
• Insert/remove-module interrupts
In the event of an interrupt, interrupt OBs are automatically executed in the CPU of
the I/O controller (see the System Software programming manual for S7300/
S7400, Program Design).
The OB number and the start information contain information on the cause of the
error and the error type.
For detailed information on the error event see the error OB with the 54 RALRM
SFB (read additional interrupt information).
Triggering of a diagnostic interrupt
When an incoming or outgoing event (for example wire break) is registered, the
module triggers a diagnostic interrupt if ”Enable: Diagnostic interrupt” is set.
The CPU interrupts the processing of the user program and processes the OB 82
diagnostic block. The result that triggered the interrupt is added to the OB 82 start
information.
Triggering a process interrupt
In the event of a process interrupt the CPU interrupts the processing of the user
program and processes the OB 40 process interrupt block. The result that
triggered the interrupt is added to the OB 40 start information.
Triggering of an insert/remove-module interrupt
The CPU interrupts the processing of the user program and processes the OB 83
diagnostic block. The result that triggered the interrupt is added to the OB 83 start
information.
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