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MELSEC-Q
4 SETTINGS AND PROCEDURES PRIOR TO OPERATION
(c) Terminal resistor must be set (or connected) for the station of both ends on
the circuit.
Match the Q series C24 to the specifications of the external device and
connect a terminal resistor (packed with the Q series C24) according to this
section.
Connect, or set a terminal resistor at the external device according to the
instruction manual of the external device.
(The terminal resistor to connect to the Q series C24)
• When communications performed using RS-422, "330
1/4 W" resistor is
connected.
• When communications performed using RS-485, "110
1/2 W" resistor is
connected.
How to discriminate between the terminating resistors
330
Ω
110
Ω
Brown
Orange
Orange
Brown Brown Brown
(d) When connecting the terminal resistor of the QJ71C24N-R4 to the RS-
422/485 plug-in socket block, insert the terminal resistor in the orientation
shown below.
Correct insertion
Inserted vertically.
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