Chapter 1 Functions; Cyclic Transmission Function; Cyclic Transmission - Mitsubishi Electric MELSEC iQ-R Series User Manual

1
FUNCTIONS
1.1

Cyclic Transmission Function

Cyclic transmission

This function allows data to be periodically exchanged among stations on the same network using link devices.
Communications using LB and LW
This function writes data on the link device (LB, LW) of the RJ71LP21-25 and sends the data to all stations connected in the
same network.
The status data of the link devices (LB, LW) of the control station are stored in the link devices (LB, LW) of each normal
station. The status data of the link devices (LB, LW) of normal stations are stored in the link devices (LB, LW) of the control
station and the link devices (LB, LW) of other normal stations.
RCPU Station No.1
Control station
B
Ó
Station No.1
send range
Station
No.2
Station
No.3
Station
Ò No.4
Sequence
scan
W LW
Ó
Station No.1
send range
Station
No.2
Station
No.3
Station
No.4
 The device is turned on by the sequence scan of the CPU module on sending side.
 The status data of the device of the CPU module on sending side are stored in the link devices (LB, LW) of the RJ71LP21-25 by link refresh.
 The status data of the link devices (LB, LW) are stored in the link devices (LB, LW) of the RJ71LP21-25 on receiving side by link scan.
 The status data of the link devices (LB, LW) are stored in the devices of the CPU module on receiving side.
■Setting method
Assign the link devices under "Network Range Assignment" in "Required Settings". (Page 55 Network Range
Assignment)
Link refresh can be set under "Link Refresh Settings" in "Basic Settings". ( Page 61 Link Refresh Settings)
Station No.2
Normal station
LB LB
Ô
Station
No.1
Station No.2
No.1
send range
Station
No.3
Station
No.4
Link
scan
LW
Station
No.1
Station No.2
send range
Station
No.3
Station
No.4
Station No.3 Station No.4
Normal station Normal station
LB LB
Station Station
No.0 No.0
No.1 No.1
Station Station
No.2 No.2
Station
Station No.3
No.2
send range No.3
Station
Station No.4
No.3
No.4 send range
LW LW
Station Station
No.1 No.1
Station Station
No.2 No.2
Station
Station No.3
send range No.3
Station
Station No.4
No.4 send range
1.1 Cyclic Transmission Function
1
RCPU
B
Õ
Ö
Sequence
scan
W
Õ
1 FUNCTIONS
17