User`s manual

9
5.2 Connecting to the RS-422/485 line
This section explains the standard method for connecting the RS-422/485 line.
Signal
abbreviation
Signal name
Signal direction
External
device
C24
Transmission data (+)
Transmission data (-)
Reception data (+)
Reception data (-)
Signal ground
Frame ground
SD
SDB
RDA
RDB
SG
FG
Frame ground
FG
( 1)
SG
SDA
SDB
RDA
RDB
SG
RDB
RDA
SDB
(FG)
SDA
QJ71C24N-R4 ( 2)
QJ71C24N
QJ71C24
(FG)
(FG)
1 QJ71C24N, QJ71C24 : CH2 side, QJ71C24N-R4 : CH1/CH2 side
2 Connect the RS-422/485 line of QJ71C24N-R4 while paying full attention
to the followings:
1) Use the RS-422/485 cable recommended in chapter 2. Performance
specifications. Be sure to strip the outer insulation layer by 7mm before
connecting the cable to the plug-in socket block.
2) When connecting the braided shield wire inside the RS-422/485 cable,
use the plate terminals included with the product. The braided shield
wire can be connected without the plate terminal. Four plate terminals
are included to connect the FG terminals of the both stations. (Refer to
section 5.2.(6)
3) When connecting the plug-in socket block to the QJ71C24N-R4, be
sure to confirm the layout of the socket block and then insert it into the
RS-422/485 connector on the QJ71C24N-R4.
SG
RDB
RDA
SDB
SDA
(FG)
Plate terminal
(included with product)
Braided shield wire
7
mm
(0.28 in.)
CH2
CH1
RS-422/485
RS-422/485
QJ71C24N-R4
(FG)
SG
RDB
RDA
SDB
SG
RDB
RDA
SDB
SDA
SDA
(FG)
QJ71C24N-R4
RUN
RD
NEU.
SD
NEU.
RD
SD
CH1
CH2
ERR.