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MELSEC-Q
7 PROGRAMMING FOR EXECUTING THE MASTER FUNCTION
(b) When the FROM/TO instruction is used
Set I/O Communication
Request to on.
Setting parameters for master function (See Section 7.3.)
Sets initial transmit data values.
Reads node communication status.
Writes transmit data.
Reads receive data.
Writes transmit data.
Reads receive data.
I/O communication function
1st slave node: Node No.1
2nd slave node: Node No.2
3rd slave node: Node No.4
4th slave node: Node No.3
Error handling program for node No.1
Input data processing program for node No.1
Error handling program for node No.2
Output data processing program
for node No.2
Error handling program for node No.4
Input data processing program for node No.4
Output data processing program
for node No.4
Error handling program for node No.3
Input data processing program for node No.3
POINT
To ensure consistency of transmit/receive data of multiple words, take a measure
such as providing a handshake area at the end of transmit/receive data to check
the data transfer.
For the program example, refer to Section 7.1 (4).
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