Wiring Of The Platinum Resistance Thermometer Sensor - Mitsubishi Electric FX3G User Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U
FX -4AD-PT-ADP (4-channel Platinum Resistance Thermometer Data Input)
3U
3.4 Selection of the Platinum Resistance Thermometer Sensor
Select the Pt100 3-wire platinum resistance thermometer sensor.
This thermometer will not be affected by voltage drop in the wiring area, and will ensure accurate
measurement.
3.5

Wiring of the Platinum Resistance Thermometer Sensor

Pt100
Pt100
L+, L-, I-, ch:  represents the channel number.
*1. Separate the cable of the platinum resistance thermometer sensor from the other power cables or
areas easily affected by inductive noise (of the commercial power, etc.).
*2. For FX
3S
available.
3.6 Grounding
Grounding should be performed as stated below.
• The grounding resistance should be 100 Ω or less.
• Independent grounding should be performed for best results.
When independent grounding is not performed, perform "shared grounding" as shown in the following
figure.
PLC
equipment
Independent grounding
Best condition
• The grounding wire size should be AWG22 to 20 (0.3 to 0.5 mm
• The grounding point should be close to the PLC, and all grounding wires should be as short as possible.
I-16
PLC User's Manual - Analog Control Edition
3UC
Twisted shielded Terminal
*1
cable
Shield
Twisted shielded
cable *1
24V DC
*2
Class-D grounding
/FX /FX Series PLC (AC power type), the 24 V DC service power supply is also
3G 3U
→ For details, refer to the User's Manual - Hardware Edition of the each PLC Series.
Other Other
PLC
equipment
Shared grounding
Good condition
3.4 Selection of the Platinum Resistance Thermometer Sensor
PT-ADP
+5V
4.7k 4.7k
block
100k
L+
L-
100k
I-
+5V
4.7k 4.7k
100k
L+
L-
100k
I-
24+
24-
Other
PLC
equipment
Common grounding
Not allowed
2
ch
ch
+5V
).
3 Wiring