PG 1 informs the CPU
of the variables
to be output.
PG 1 requests the
current data.
PG 1 requests the
current data.
PG 1 requests the
current data.
PG 1 requests the
current data.
First job of PG 2 is processed
Second job sent by PG 2 is processed
PG 2 sends the first job
PG 2 sends the second job
First job of PG 2 complete
Second job of PG 2 complete
PG 1 must wait until
the CPU is free.
PG 2 must wait until
the CPU is free.
PG 1 must wait until
the CPU is free.
CPU 948
User on PG 1
User on PG 2
Fig. 11-8 Sequence of two parallel cyclic functions
Parallel Operation of Two Serial PG Interfaces
CPU 948 Programming Guide
11 - 24 C79000-G8576-C848-04
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