Technical data

Possible errors

•• Illegal function number in ACCU-2-L

•• One of the reserved bits in ACCU 1 (no. 4 to 31) is set to ’1’

In the event of error,

OB 31 (other runtime errors) is called. If OB 31

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

In both cases, the error ID

1A4BH is entered in ACCU-1-L.

Notes

•• You can scan the status of the 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 123

4. Read out ACCU 1

•• You can determine the status of interrupt processing by reading

out system data word RS 137.

- RS 137 Condition code word "delay individual

time-driven interrupts"

OB 123: Enable/Disable "Delay of Individual Time-Driven Interrupts"

CPU 928B Programming Guide

C79000-B8576-C898-01

6 - 27