Mitsubishi Electric CC-Link IE Basic Reference Manual page 31

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.
Master station
END
Program
Ls
St
(1)
END
Program
St
Ls
(1)
END
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.
• 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)
Slave station 1
Ò
Ó
Ò
Ó
Ò
Slave station 2
Ô
Ô
7.1 Cyclic Transmission
7
7 FUNCTIONS
29