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Digital modules

4.5 Interrupts of the digital modules

S7-400 Automation System Module Data

Reference Manual, Edition 09/2009, A5E00850736-06

103

4.5 Interrupts of the digital modules

Introduction

This section describes the interrupt behavior of the digital modules. There are two types of

interrupt:

● Diagnostic interrupt

● Hardware interrupt

Note that not all digital modules have interrupt capability or they are only capable of a subset

of the interrupts described here. For information on the digital modules that support

interrupts, refer to their specifications.

For detailed information on the OBs and SFCs mentioned below, refer to the

STEP 7 Online

Help

Enabling interrupts

The interrupts are not preset - in other words, they are inhibited without appropriate

parameter assignment. Interrupts are enabled in

STEP 7

Special feature: The module is inserted in ER-1/ER-2

Note

If you use the digital module in ER-1/ER-2, you must set the parameters for enabling all the

interrupts to "No" because the interrupt lines are not available in ER-1/ER-2.

Diagnostic interrupt

When diagnostic interrupts are enabled, incoming error events (initial occurrence) and

outgoing error events (error is cleared) are reported by means of an interrupt.

The CPU interrupts user program execution, and executes diagnostic interrupt OB82.

In the user program, you can call SFC 51 or SFC 59 in OB 82 to obtain more detailed

diagnostic information from the module.

The diagnostic information is consistent until such time as OB 82 is exited. When OB 82 is

exited, the diagnostic interrupt is acknowledged on the module.

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