A4-8
IM 34M06H62-02E 2nd Edition : June 2008-00
A4.3 Wiring
After attaching the module to the base module, connect the input and output signal wires
to the module. This section describes wiring precautions. Actual wiring can be performed
before or after program creation, at your convenience.
A4.3.1 Wiring Precautions
To wire the module, see Section A4.3.2, “Terminal Wiring Diagram” and observe the
following precautions.
(1) For thermocouples with a terminal box, use the specified compensating wire.
(2) For resistance temperature detector (RTD) input, use a lead wire with low
resistance (10 /wire max.) with the three wires having identical resistance.
(3) To protect the input circuitry against noise, observe the following precautions.
(a) The wiring for the input circuit must be kept as far away as possible from the
power supply or grounding circuitry.
(b) Twisting the input wire at short equal intervals may be effective against
interference from electromagnetic-induced noise.
(c) Using a shielded wire may effectively protect against static-induced noise.
Strip off the outer shield to expose the wire, and ground it with an FG clamp.
(two-point grounding should be avoided.)
(d) Attach a ferrite core to the wire near the exit of the panel enclosure to reduce
the effect of noise if the input wiring leads outside the panel enclosure.
Figure A4.5 Wiring Precautions
Table A4.3 FG Clamps and Ferrite Core Recommended by Yokogawa
FG clamp Kitagawa Kogyo Industries Co., Ltd. FGC Series
Ferrite core
Kitagawa Kogyo Industries Co., Ltd. RFC Series
TDK Corporation ZCAT Series
Tokin Corporation ESD-SR Series
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