2
1.3 Definition of terminal
The user terminals are shown in Figure 1-3
No.
Marking
Instruction
No. Marking
Instruction
1
24V
Analogue power supply 24V positive
2
COM Analogue power supply 24V negative
3
R1+
Positive input for channel 1 RTD signal
4
I1+
Channel 1 RTD signal auxiliary positive input
5
R1–
Channel 1 RTD signal negative input
6
I1–
Auxiliary negative input for channel 1 RTD signal
7
R2+
Positive input for channel 2 RTD signal
8
I2+
2nd channel RTD signal auxiliary positive input
9
R2-
Positive input for channel 2 RTD signal
10
I2–
Channel 2 RTD signal auxiliary negative input
11
R3+
Positive input for channel 3 RTD signal
12
I3+
3rd channel RTD signal auxiliary positive input
13
R3–
Channel 3 RTD signal negative input
14
I3–
3rd channel RTD signal auxiliary negative input
15
R4+
Positive input for channel 4 RTD signal
16
I4+
Channel 4 RTD signal auxiliary positive input
17
R4-
Positive input for channel 4 RTD signal
18
I4-
Channel 4 RTD signal auxiliary negative input
Figure 1-3 Terminal definition table
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.
Pu sh to t h e ri g ht
Pu sh to t h e l eft
V C1-1 61 4M AR
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
Figure 1-5 Diagram of user terminal wiring
The diagrams
①
-
⑤
indicate the five aspects that must be taken into account when wiring.
V
+
DC
/
DC
Converter
AGND
I
+
4
Thermal resistance
I
+
R
2
+
-
Thermal resistance
CH4
I
1
+
R
1
+
1
-
Thermal resistance
+
+
Thermal resistance
+
Thermal resistance
+
+
-
4-wire connection method
2-wire connection method
3-wire connection method
AGND
AGND
AGND
24VDC%±10%
55mA
VC-4PT
|
CH2
CH1
+5V
-5V
I1+
R1+
R1-
I1-
I1+
R1+
R1-
I1-
I1+
R1+
R1-
I1-
I2+
R2+
R2-
I2-
I1+
R1+
R1-
I1-
I4+
R4+
R4-
I4-
24V+
24V-
