Siemens CPU 948 - OB 125: Generate STEP 5 Blocks

6.5 OB 125: Generate STEP 5 Blocks
Function With OB 125, you can generate any STEP 5 blocks (logic and data
blocks) in the user memory. Generating logic blocks should, however,
be left to specialists.
The specified block is set up in the internal RAM with a block header
and block body and entered in DB 0. The block body contains random
data. For this reason, a newly generated block must first be written to
before any useful data can be read out of it.
Parameters 1. ACCU-1-LH
Block type of the block to be generated
2. ACCU-1-LL
Block number of the block to be generated
Permitted block types and numbers
ACCU-1-LH (block type) ACCU-1-LL (block number)
1 = PB
2 = SB
3 = FB
4 = FX
5 = DB
6 = DX
7 = OB
0 to 255
0 to 255
0 to 255
0 to 255
3 to 255
3 to 255
1 to 39
3. ACCU-2-L
Number of words (required block length without block header). The
maximum assignable block length is 32762 data words. At present,
approximately 2 K words can be edited with a PG.
Result After correct and error-free processing, the system program sets the
RLO to ’0’ and clears the condition codes CC 1 and CC 0.
Note
While the blocks are actually being generated, user interrupts are
disabled: no interrupts come through.
By calling OB 125, the contents of ACCU 1 to ACCU 4 are
modified. The BR register is retained.
OB 125: Generate STEP 5 Blocks
CPU 948 Programming Guide
C79000-G8576-C848-04
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