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Multiprocessor Mode
Example
CPU 1
IPC output flags:
FY 96 to FY 119
IPC input flags:
FY 120 to FY 125
CPU 2
IPC output flags:
FY 120 to FY 125
IPC input flags:
FY 96 to FY 119
Fig. 10-1
Transferring IPC flags in the multiprocessor mode
10 - 6
Write
Read
Write
Read
Note
The only flag bytes that you can specify as IPC flags are the ones
enabled on the coordinator or on the CP(s). S flags cannot be
used as IPC flags!
A flag byte that is defined on one or more CPUs as an IPC input
flag byte must be defined as an IPC output flag byte on one other
CPU or CP. An IPC output flag byte is only allowed on one CPU,
but this may be used as an IPC input flag in all other CPUs in the
rack.
If you have flag bytes that you have not defined as IPC flags in a
CPU, you can use them as normal flags!
In DB 1, indicate only the number of IPC flag bytes that you actually
need: the smaller the number of IPC flag bytes, the shorter the
transfer time!
Coordinator
Enabled area
per jumpers:
IPC flag bytes
FY 96 to FY 127
CPU 948 Programming Guide
C79000-G8576-C848-04
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