NAiS FP Series User Manual page 138

FPΣ
PLC link
Data is shared with PLCs connected through the MEWNET, using dedicated internal
relays "Link relays (L)" and data registers "Link registers (LD)".
When using link relays, if the link relay contact for one PLC goes on, the same link relay
also goes on in each of the other PLCs connected to the network.
With link registers, if the contents of a link register are rewritten in one PLC, the change
is made in the same link register of each of the other PLCs connected to the network.
With a PLC link, the status of the link relays and link registers in any one PLC are fed
back to all of the other PLCs connected to the network, so control of data that needs
to be consistent throughout the network, such as target production values and type
codes, can easily be implemented to coordinate the data, and all of the units are booted
at the same timing.
Link relay
When the link relay "L0" of the master station (No. 1) is turned on, that signal is converted
by the ladder programs of the other stations, and the Y0 of the other stations are output.
R0 L0
No. 1
FPΣ
R0
F0, MV, K100, LD0
No. 1 Link register
LD 0 100
Link register
If a constant of 100 is written to LD0 of the master station (No. 1), the contents of
LD0 in the other station (No. 2) are also changed to a constant of 100.
Figure 129: FPΣ PLC link function
Applicable communication cassette
For 1:N communication
L0 Y0
No. 2
FPΣ
RS485
No. 2 Link register
LD 0 100
. . . 1 - channel RS485 type (Part No. FPG - COM3)
7.1 Communication Functions of FPΣ
L0 Y0
No. 3
FPΣ
No. 3 Link register
LD 0 100
L0 Y0
No. 4
FPΣ
No. 4 Link register
LD 0 100
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