Application example
Application of FB 100/101 on the S5-155U
Task
You want to exchange data between three CPUs:
- From CPU 1 to CPU 2: data block DB 3, DW 0 to DW 127 (= 4 data fields)
- From CPU 1 to CPU 3: data block DX 4, DW 0 to DW 63 (= 2 data fields)
- From CPU 2 to CPU 1
and CPU 3:
data block DB 5, DW 0 to DW 95 (= 3 data fields)
Function block FB 1 is the interface for the cyclic user program on all
three CPUs. CPU 1 calls the INITIALIZE function (OB 200) during the cold
restart. The link list is in data block DB 100.
Continued on the next page
DB 5, 3 data fields
DB 3,
4 data
fields
DB 5,
3 data
fields
DX 4, 2 data fields
CPU 2 CPU 3
CPU 1
Fig. 10-7 Data exchange between 3 CPUs
Applications
CPU 948 Programming Guide
C79000-G8576-C848-04
10 - 77
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