7 FUNCTIONS
7.1 Cyclic Transmission
29
7
MELSEC iQ-F
After sending requests to all slave stations, the master station receives responses from slave stations in END processing.
After receiving responses from all the slave stations, the master station performs link refresh and starts the next link scan.
• If the scan time is smaller than link scan time, link refresh is not performed until the master station receives
responses from all slave stations.
• When the CPU module is accessed by GX Works3/GX Works2, the link scan time may not be constant. Set
an appropriate time for the timeout time. ( Page 23 Data flow of cyclic transmission, Page 39 Link
Scan Setting)
St: Scan time (sequence scan)
Ls: Link scan
END: END processing
The master station sends a request to slave station 1 and slave station 2.
Slave station 1 sends a response to the master station.
Slave station 2 sends a response to the master station.
(1) Although the master station received responses from slave station 1 and slave station 2, the master station does not start the next link scan until link refresh
is performed in END processing.
Ò
Ò
Ó
Ô
Ô
Ò
Ó
Ls
Ls
(1)
(1)
St
St
END
END
END
Master station Slave station 1 Slave station 2
Program
Program
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