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MELSEC-Q
5 SETTINGS AND PROCEDURES UP UNTIL OPERATION
(b) If connecting 1:n (multiple drop)
Terminal Resistor
R
R
R
SDA
SDB
RDA
RDB
SG
FG
SDA
SDB
RDA
RDB
SG
FG
QD51-R24 External Device 1) External Device 2)
External Device n
RS-422/485
Cable
RS-422/485
Cable
SDA
SDB
RDA
RDB
SG
FG
R
RS-422/485
Cable
R
SDA
SDB
RDA
RDB
SG
FG
(c) If connecting n:1 (multiple drop)
R
SDA
SDB
RDA
RDB
SG
FG
QD51-R24 1) QD51-R24 2) QD51-R24 n
SDA
SDB
RDA
RDB
SG
FG
R
SDA
SDB
RDA
RDB
SG
FG
SDA
SDB
RDA
RDB
SG
FG
R
Terminal Resisto
External Device 1)
RS-422/485
Cable
RS-422/485
Cable
RS-422/485
Cable
(d) If connecting m:n (multiple drop) (External Device: QD51 (-R24))
R
SDA
SDB
RDA
RDB
SG
FG
QD51-R24 m
SDA
SDB
RDA
RDB
SG
FG
R
SDA
SDB
RDA
RDB
SG
FG
SDA
SDB
RDA
RDB
SG
FG
R
QD51-R24 1)
Terminal Resisto
External Device n
RS-422/485
Cable
RS-422/485
Cable
RS-422/485
Cable
External Device 1)
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