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1.3 Definition of terminal
The user terminals are shown in Figure 1-3
No.
Marking
1
24V
Analogue power supply 24V positive
3
R1+
Positive input for channel 1 RTD signal
5
R1–
Channel 1 RTD signal negative input
7
R2+
Positive input for channel 2 RTD signal
9
R2-
Positive input for channel 2 RTD signal
11
R3+
Positive input for channel 3 RTD signal
13
R3–
Channel 3 RTD signal negative input
15
R4+
Positive input for channel 4 RTD signal
17
R4-
Positive input for channel 4 RTD signal
1.4 Access system
The expansion interface allows the VC-4PT to be connected to a main module of the VC series
PLC or to other expansion modules. The expansion interface can also be used to connect other
expansion modules of the same or different models of the VC series. This is shown in Figure 1-4.
Figure 1-4 Schematic diagram of the connection to the main module and other expansion modules
1.5 Wiring instruction
User terminal wiring requirements, as shown in Figure
Thermal resistance
I4+
I +
R4+
R4-
I4-
4
4-wire connection method
I2+
I +
R2+
R 2 +
R2-
-
I2-
Thermal resistance
I1+
I 1 +
R1+
R 1 +
R1-
1 -
I1-
|
24V+
24VDC%± 10%
V +
55mA
24V-
The diagrams ① - ⑤ indicate the five aspects that must be taken into account when wiring.
Instruction
Figure 1-3 Terminal definition table
Push to t he ri ght
V C1-1 61 4M AR
Thermal resistance
CH4
AGND
Thermal resistance
CH2
AGND
Thermal resistance
CH1
AGND
+5V
Converter
AGND
DC / DC
-5V
VC-4PT
Figure 1-5 Diagram of user terminal wiring
No.
Marking
2
COM
Analogue power supply 24V negative
4
I1+
Channel 1 RTD signal auxiliary positive input
6
I1–
Auxiliary negative input for channel 1 RTD signal
8
I2+
2nd channel RTD signal auxiliary positive input
10
I2–
Channel 2 RTD signal auxiliary negative input
12
I3+
3rd channel RTD signal auxiliary positive input
14
I3–
3rd channel RTD signal auxiliary negative input
16
I4+
Channel 4 RTD signal auxiliary positive input
18
I4-
Channel 4 RTD signal auxiliary negative input
Push to t he l eft
I1+
+
R1+
+
R1-
I1-
2-wire connection method
I1+
+
R1+
R1-
I1-
I1+
+
R1+
+
R1-
-
I1-
3-wire connection method
2
Instruction
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