Technical data

Possible errors:

•• Illegal function number in ACCU-2-L

•• One of the reserved bits in ACCU 1 is set to "1".

In the event of an error,

OB 31 (other runtime errors) is called. If

OB 31 is not loaded, the CPU goes to the STOP mode.

In both cases, an error ID is entered in ACCU-1-L.

Notes

•• You can scan the status of a control word with the following

program sequence:

1. Load the function number 2 or 3 in ACCU-2-L

2. Load the value "0" in ACCU 1

3. Call special function OB 121

4. Read out ACCU 1

You can determine the status of the time-driven interrupt processing

by reading out system data word RS 135.

- RS 135 Condition codeword "disable individual interrupts"

OB 121: Enable/Disable Individual Time-Driven Interrupts

CPU 928B Programming Guide

C79000-B8576-C898-01

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