Instruction manual

3
4. n : 1 Connection (Multi-link) 3-17
Serial Communications
Wiring
Connection with Link Unit
Use the RS-485 2-wire connection. (It is recommended that terminal converter “ZM-1TC”
be used.)
• The communication port of Sharp's PLCs is not capable of multilinked connection.
• When ZM-1TC is used:
Set “2-wire connection” at the DIP switch (SW1) on ZM-1TC. When a jumper is
required on the PLC:
When no jumper is required on the PLC:
• When ZM-1TC is not used:
Install jumpers between +RD/+SD and −RD/−SD.
FG
+RD
−RD
+SD
−SD
SG SG
ZM-1TC
FG
+RD
−RD
+SD
−SD
SG
ZM-1TC
FG
+RD
−RD
+SD
−SD
SG
ZM-1TC
Terminating resistance
(OFF)
Signal
Name
Shield
Shield
Shield
To the PLC’s
RS422 port of the
link unit
Send data (+)
Send data (−)
Receive data (+)
Receive data (−)
Terminating resistance
(ON)
Terminating resistance
(OFF)
Terminating resistance
(ON)
Signal
Name
Signal
Name
FG
+RD
−RD
+SD
−SD
SG
ZM-1TC
FG
+RD
−RD
+SD
−SD
SG
ZM-1TC
FG
+RD
−RD
+SD
−SD
SG
ZM-1TC
SG
Terminating resistance
(OFF)
Signal
Name
Shield
Shield
Shield
To the PLC’s
RS422 port of the
link unit
Send data (+)
Send data (−)
Terminating resistance
(ON)
Terminating resistance
(OFF)
Terminating resistance
(ON)
Signal
Name
Signal
Name