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6. LOADING AND INSTALLATION
MELSEC-A
POINTI
.(1) Ground the surge absorber (El) an the PC (E2) separately from each
other.
(2) Select a surge absorber making allowance for power voltage rises.
(2)
Wiring of I/O equipment
(a) Applicable size of wire to the terminal block connector is 0.3 (18) to
2 mm 2 (14 AWG). However, it is recommended to use wires of 0.75
mm
2
(18 AWG) for convenience.
(b) Separate the input and output lines.
(c) I/O signal wires must be at least 100 mm (3.94 in) away from
high-voltage and large-current main circuit wires.
(d) When the I/O signal wires cannot be separated from the main circuit
wires and power wires, ground on the PC side with batch-shielded
cables. Under some conditions it may be preferable to ground on
the other side.
PC
Shielded cable
~-----7'
~
I
Input
<>-----.
Output
9--0--1
DC
(e) If wiring has been done with piping, ground the piping.
(f) Separate the 24 VDC I/O cables from the 100 VAC and 200 VAC
cables.
(g) If wiring over 200 m (656.2 tt) or longer distance, trouble can be
caused by leakage currents due to line capacity referring to the I/O
error examples in the A2C I/O module User's Manual.
6-6

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