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8-4 One-to-one PC Links
If two PCs are linked one-to-one by connecting them together through their
RS-232C ports, they can share common LR areas. When two PCs are linked
one-to-one, one of them will serve as the master and the other as the slave.
As shown in the diagram below, when data is written into a word the LR area of
one of the linked Units, it will automatically be written identically into the same
word of the other Unit. Each PC has specified words to which it can write and
specified words that are written to by the other PC. Each can read, but cannot
write, the words written by the other PC.
1
11
Master Slave
Master area
Slave area
Written automatically.
Write “1” Master area
Slave areaWrite
CPU PS
C200HX/HG/HE
CPU PS
C200HX/HG/HE
Wiring Wire the cable as shown in the diagram below using the connector listed.
Applicable Connectors
The following connectors are applicable. One plug and one hood are included
with the CPU Unit. The same connectors can be used for both ends of the cable.
Plug: XM2A-0901 (OMRON) or equivalent
Hood: XM2S-0911 (OMRON) or equivalent
1
2
3
4
5
6
FG
SD
RD
RS
CS
–
–
–
SG
7
8
9
1
2
3
4
5
6
7
8
9
FG
SD
RD
RS
CS
–
–
SG9
C200HX/HG/HE C200HX/HG/HE, C200HS, or CQM1
Signal
Abb.
Pin
No.
Signal
Abb.
Pin
No.
–
Note Ground the FG terminal of the PC to a resistance of 100 Ω or less.
One-to-one PC Links
Section 8-4