NAiS FP Series User Manual page 217

Communication Function 3 PLC Link Function
Link register allocation
FPΣ
(Unit No. 1)
LD0
No.1
Transmitted
area
39
40
No.2
Received area
No.3
127
Figure 210: Example of link register allocation
System register
No. Name
No. 41 Range of link register used for PLC link
No. 44 Starting no. for link register transmission
No. 45 Link register transmission size
When link areas are allocated as shown above, the No. 1 transmitted area can be
transmitted to the No. 2, No. 3 and No. 4 received areas. Also, the No. 1 received area
can receive data from the No. 2 and No. 3 transmitted areas. No. 4 is allocated as a
received area only, and can receive data from No. 1, No. 2, and No. 3, but cannot
transmit it to other unit.
10 - 12
FPΣ
(Unit No. 2)
LD0
No.1
Received area
39
40
No.2
Transmitted
area
79
80
No.3
Received area
127
FPΣ
(Unit No. 3)
LD0
Received area
79
80
Transmitted
area
127
Set value of various control unit
No. 1 No. 2
128 128
0 40
40 40
FPΣ
FPΣ
(Unit No. 4)
LD0
No.1
No.2
Received area
No.3
127
No. 3 No. 4
128 128
80 0
48 0