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1.4

Interrupts of the SM 321; DI 16

Introduction

This section describes the interrupt behavior of the SM 321; DI 16

following interrupts exist:

S Diagnostic interrupt

S Hardware interrupt

The OBs and SFCs mentioned below can be found in the online Help for STEP 7,

where they are described in greater detail.

Enabling interrupts

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

appropriate parameter assignment. Assign parameters to the Interrupt Enable in

STEP 7 (refer to Section 1.2).

Diagnostic interrupt

If you have enabled diagnostic interrupts, then active error events (initial

occurrence of the error) and departing error events (message after

troubleshooting) are reported by means of an interrupt.

The CPU interrupts the execution of the user program and processes the

diagnostic interrupt block (OB 82).

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.

Hardware interrupt

The SM 321; DI 16

group at a rising edge, a falling edge, or at both edges of a signal status change.

Perform parameter assignment one channel group at a time. It can be modified at

any time (in RUN mode using the user program).

Pending hardware interrupts trigger hardware interrupt processing in the CPU

(OB 40). The CPU interrupts the execution of the user program or of the priority

classes with low priority.

You can set in the user program of the hardware interrupt OB (OB 40) how the

programmable logic controller has to react to an edge change. When the hardware

interrupt OB is exited, the hardware interrupt is acknowledged on the module.

The module can buffer one interrupt per channel. If no higher priority run-time

levels are waiting to be processed, the buffered interrupts (of all modules) are

serviced one after the other by the CPU according to the order in which they

occurred.

DC 24 V can trigger a hardware interrupt for every channel

Product Information on the Manual S7-300 Module Specifications, Edition 11/2002

DC 24 V

DC 24 V. The

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