User`s manual

FX communication
Wiring 3
3-7
3
3.3.3 One-pair Wiring
Note:
*1 R is a terminating resistor (110
Ω
)
*2 Make sure to connect the shield of the appropriate cable with the FX
2N
-485-BD, FX
1N
-485-BD
or FX
2NC
-485ADP to ground that has a resistance of 100
Ω
or less (Class D grounding).
*3 Make sure to connect the terminal FG to the ground terminal of a programmable
controller grounded with resistance of 100
Ω
or less (Class D grounding).
However, for a computer link unit of the A series programmable controller, see the manual of
the computer link unit.
*4 When using an RS-232C/485 converter, use the FX-485PC-IF.
Have in mind that "echo" occurs on the RS-232C side if one-pair wiring is performed using the
FX-485PC-IF.
*5 In the case of FX
2NC
-485ADP
Class D grounding
R*1
SDA
SDB
RDA
RDB
SDA
SDB
RDA
RDB
SDA
SDB
RDA
RDB
LINK
SG
*3
FG
SDA
SDB
RDA
RDB
SG
*3
FG
R*1
RS-485 unit *4
SG
*2
SG
(NC)*5
FX
2NC
-485ADP
FX
1N
-485-BD,FX
2N
-485-BD
FX
A series programmable
(0N)
-485ADP
controller's computer link unit
Station
No. 0
Station
No. 1
Station
No. 15