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Data block DX 0
Using the RT area
Organization blocks
Error OBs
Special function OBs
CPU 948 Programming Guide
C79000-G8576-C848-04
Converting User Programs of the CPU 928B for the CPU 948
You must create a new DX 0 data block (see Chapter 7), since the
DX 0 for the CPU 928B has a different structure and settings.
With the CPU 928B, the RT area is not used by the system program,
with the CPU 948 it is used to some extent by the handling blocks.
You can only use the RT area for your user program when you do not
use any standard FBs and any PG functions via SINEC H1 and the S5
bus.
The number and function of the error and special function OBs are not
the same on the CPU 928B and CPU 948:
The following error OBs of the CPU 948 respond differently from
their namesakes on the CPU 928B:
OB
OB 19
Same as on
OB 26
CPU 928
OB 27
OB 28
Function different
OB 29
from that on
OB 30
CPU 928B
OB 31
OB
OB 110
OB 152
OB 160 to 163
OB 170
OB 190 to 193
OB 216 to 218
These OBs do not exist on the CPU 948
OB 220 and 221
OB 224
OB 226 to 228
OB 240 to 242
OB 250 and 251
On the CPU 948, the OB is replaced by :
OB 111
OB 131
OB 112
OB 132
OB 113
OB 133
OB 120
OB 122
OB 121
OB 141
OB 122
OB 142
OB 123
OB 143
Function
Error IDs
Different from
CPU 928B
Note
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