Technical data

G DB/GX DX Generating a data block
The operation G DBx generates a DB data block with the number x
(3
≤ x ≤ 255) in the user memory of the CPU. The content of the data
block is
not assigned the value 0, i.e. the data words can have any
contents.
Before programming this statement, you must store the number of
data words that the new DB is to have in ACCU-1-L. The operation
"G DB" or "GX DX" creates the block header. A data block generated
in this way (
without block header) can occupy a maximum of 4091
words. You can generate longer data blocks using OB 125.
If the data block already exists, the length of the DB is not permitted
or there is not enough space in the DB-RAM, the system program
calls
OB 31. If this is not loaded, the CPU goes to the stop mode.
The GX DXx operation generates a DX data block in the DB-RAM
and is otherwise the same as G DBx.
NOP/display/stop operations
Operation Operand Function
N O P 0
N O P 1
– No operation
No operation
B L D 0 to 255 Display generation operation for the PG:
the CPU handles the operation like a no operation
S T P – CPU changes to soft STOP.
Table 3-10 NOP/display/stop operations
3
Basic Operations
CPU 928B Programming Guide
C79000-B8576-C898-01
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