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MELSEC-Q
7 PROGRAMMING FOR EXECUTING THE MASTER FUNCTION
(2) Program
example
(a) When Data consistency dedicated instruction (DNTMRD, DNTMWR) is
used
Error handling program for node No. 1
Setting parameters for master function (See Section 7.3.)
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
Enables Data consistency-
dedicated instruction setting
for master function.
Reads Data consistency-
dedicated instruction setting
status for master function.
I/O communication function
Ensures data consistency and reads the receive data.
1st slave node: Node No. 1
2nd slave node: Node No. 2
3rd slave node: Node No. 4
4th slave node: Node No. 3
Ensures data consistency and writes the send data.
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