Technical data

Procedure with the FREE mode: master transmits to slave
Explanation of Fig. 10.2:
➣
The control program modifies the output byte to be transmitted (PY 1).
➣
In the CP cycle, the CP 5430 TF transmits the whole of the output area
assigned to ZP. In the FREE mode, the CP cycle determines the point
at which the data is transmitted.
In the FREE mode, the time when the CP 5430 TF transmits the ZP output
bytes is not fixed.
PLC
program
execution
I/O
area in
CP- DPR
PY1
to the BUS
0
7
7
8
9
9
0
9
The byte
transmitted
by ZP
7
8
9
1
1
Internal
CP cycle=
"after processing
the polling list"
tt
7
Fig. 10.2: How the FREE Mode Functions: Master Transmits to Slave
B8976060/02 Communication with Cyclic I/Os
10 - 7 Volume 1