AS Series Module Manual
7- 38
7.2.8 Wiring
Precautions
To ensure the analog-to-digital module functions well and reliably, the external wiring must prevent noise.
Before you install the cables, follow the precautions below.
(1) To prevent a surge and induction, the AC cable and the input signal cables that are connected to the
ASTC-A Series must be separate cables.
(2) Do not install the cable near a main circuit, a high-voltage cable, or a cable connected to a load
which 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 which is not a PLC.
(3) Ground shielded cables and hermetically sealed cables separately.
(4) Terminals with insulation sleeves cannot be arranged as a terminal block, so you should cover the
terminals with insulation tubes.
(5) Note1: do not wire empty terminals.
(6) Note2: only use copper conducting wires with a temperature rating of 60/75°C and the length must
be less than 50 m.
(7) Note3: TC modules must run for 30 minutes before they start to take any temperature measurement.
External wiring
Shielded cable*1
CH 1
+
-
I3 +
I3 -
CH3
INA
ADC
+
-
J,K,R,S,T,E,N, B
-100mV ~1 00m V
I 1 +
I1 -
SLD
SLD
C old junct ion-
c ompensation
*1. Use shielded twisted pair cables for Type J, type K, type R, type S, type T, type E, type N
and type B thermocouples, and keep them separate from power cables and other cables
which generate noise.
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