Technical data

6.27 OB 226: Reading a Word from the System Program
Function The system program of the CPU is 128 x 2
10
words long and is
located in a memory area that you cannot access with STEP 5
statements. Using OB 226, however, you can
read individual data
words from this memory area.
Note
For using OB 226, please see the description of OB 227 and the
relevant programming example.
Parameters ACCU 1
Address of the system program memory location to be read
permitted values 0 to 0001 FFFF H
Result - ACCU-1-L: contains the word read from the system program
- ACCU-1-H: = 0
- ACCU 2 contains the previous contents of ACCU 1
(i.e. the address); the previous contents of
ACCU 2 are lost.
Possible errors none
6
OB 226: Reading a Word from the System Program
CPU 928B Programming Guide
C79000-B8576-C898-01
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