Mitsubishi Electronics MELSEC-F Manuel D’Utilisation

3 Wiring

FX

3G

/FX

3U

/FX

3UC

 PLC User's Manual - Analog Control Edition

FX

3U

-4AD-TC-ADP (4-channel Thermocouple Data Input)

• There are 2 types of thermocouples: K type and J type. When selecting the thermocouple type, make sure 

that the same type of thermocouple is connection to all the channels.

• Be sure to use a non-grounded thermocouple type.

To connect the thermocouple, use one of the following types of compensating lead wires:

• The compensating lead wire indicates a temperature value of approximately 0.12

°

C higher than that of the 

wire resistor (10

Ω). Use the appropriate compensating lead wire when considering this difference.

• If the compensating lead wire is very long, the wire may be easily affected by noise, etc. It is, therefore, 

recommended for the length of the compensating lead wire to be 100 m or less.

Wiring depends on the thermocouple type selected. Refer to the following wiring diagrams:

*1.

It is not necessary to connect lines to the J-type terminals. Leave these terminals disconnected.

*2.

Keep the thermocouple away from inductive noise (commercial power, etc.).

Type K

KX,KCA,KCB,KCC

Type J

JX

3k

Ω

ch

TC-ADP

Class-D

grounding

+5V

L +

L -

24+

24-

Compensating

lead wire

Terminal block

24V DC

L +, L -, ch :  represents the channel number.

Type J
Type J

Thermocouple

type K

*2

ch

L +

L -

3k

Ω

Temperature

compensating circuit

Temperature

compensating circuit

Shield

OPEN*1