FPΣ User's Manual
8.7 PLC Link
231
8.7.2.4 Precautions for Allocating Link Areas
A mistake in the link area allocation will cause an error, and communication will be disabled.
Avoid overlapping send areas
When sending data from the send area to the receive area of another PLC, send and receive
areas must match. In the example shown below, there is an overlapping area between units
no. 2 and 3, and this will cause an error, so that communication cannot be carried out.
WL0
19
20
63
WL0
19
20
63
WL0
63
39
40
29
40
#1 #2 #3
#1
#2
#3
#1
#3
Send area
Overlapping area
System register settings
Station settings
No. Name
#1 #2 #3
40
Link relays - Send/receive area - Number of words shared by all linked PLCs 64 64 64
42
Link relays - Send area - Start sending from this word address 0 20 30
43
Link relays - Send area - Number of words to send 20 20 34
Invalid allocations
The following allocations are not possible, neither for link relays nor for link registers:
• Send area is split
• Send and receive areas are split into multiple segments
Send area
Receive area
To Next Page
Loading...