Chapter 9 Serial Communication Module AS00SCM
9- 7
9.2.4 Wiring
9.2.4.1 AS00SCM-A Power Wiring
COM mode: Serial communication extension mode
Turn the work mode to COM. Install the module on the right hand side of the AS Series CPU. To avoid problems, do
not use an external power supply for AS00SCM-A.
RTU mode: Remote module mode
Turn the work mode to RTU. This module is equipped with an independent DC power connecter.
To ensure the serial communication module functions well and reliably, the external wiring must prevent noise. Before
you install cables, follow the precautions below.
(1) To prevent a surge and induction, the DC cable and other power cables that are connected to the AS00SCM-
A must be separate cables. An independent power supply is recommended for the AS00SCM-A.
DC Power Supply
24VD C
Min 1.5A
SCM
AS Series IO
DC Power Supply
24VD C
2 4V0V
Ground
Ground
Ground
Ground
24V
0V
Other
devices
DC Power Supply
24VD C
Ground
24V
0V
(2) The 24 VDC cable should be twisted pair, and the shorter end should be connected to the module.
(3) The cable (110 VAC, 220 VAC, and 24 VDC) must not be installed near a main circuit, a high-voltage cable,
or a cable connected to a load that is not a PLC. In addition, the cable must not be bound to a main circuit, a
high-voltage cable, or a cable connected to a load that is not a PLC. All the cables should be wired at least
100 mm apart.
(4) Ground the power supply using a 14 AWG wire.
(5) Connect 20–14 AWG (1 mm) wires to the input/output terminals. Use only copper leads that can resist
temperatures above 60° C /75° C.
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