IVC-EH-4TC/8TC Thermocouple-type
Temperature Input Module
User Manual
Thanks for choosing the programmable logic controllers (PLCs) developed
and produced by INVT Auto-Control Technology (Shenzhen) Co., Ltd. Before
using the IVC-EH-4TC/8TC series PLC products, read this manual carefully
to understand the product features, so that you can install and use the
products properly and make full use of its abundant functions.
Note:
Before using the product, read the operation instructions and precautions
carefully to prevent accidents. Only trained personnel can install and operate
the product, and when installing and operating the product, the operators
must strictly follow the related industrial safety specifications and the
precautions and special safety guide provided in this manual to perform
operations properly.
1 Interface description
1.1 Interface introduction
Cover plates are provided for the extension cable interfaces and user
terminals of the IVC-EH-4TC/8TC module, as shown in Figure 1-1. You can
see the extension cable interfaces and user terminals after opening the cover
plates, as shown in Figure 1-2.
Figure 1-1 Module appearance
diagram
Figure 1-2 Module interface
diagram
The IVC-EH-4TC/8TC module is connected to the main module through a
patch board, and the extension modules are connected in cascade mode to
implement hard connection. For the specific connection method, see the
connection diagram in Figure 1-3.
Table 1-1 describes the definition of IVC-EH-4TC/8TC user terminals.
Table 1-1 Definition of IVC-EH-4TC/8TC user terminals
SN
Label
Description
SN
Label
Description
1
24V+
Positive pole of
the 24 V analog
power supply
11
L4+
Positive pole of the
thermocouple of
channel 4
2
24V–
Negative pole of
the 24 V analog
power supply
12
L4–
Negative pole of
the thermocouple of
channel 4
3
.
Empty pin
13
L5+
Positive pole of the
thermocouple of
channel 5
4
PG
Ground terminal
14
L5-
Negative pole of
the thermocouple of
channel 5
5
L1+
Positive pole of
the thermocouple
of channel 1
15
L6+
Positive pole of the
thermocouple of
channel 6
6
L1-
Negative pole of
the thermocouple
16
L6–
Negative pole of
the thermocouple of
SN
Label
Description
SN
Label
Description
of channel 1
channel 6
7
L2+
Positive pole of
the thermocouple
of channel 2
17
L7+
Positive pole of the
thermocouple of
channel 7
8
L2–
Negative pole of
the thermocouple
of channel 2
18
L7-
Negative pole of
the thermocouple of
channel 7
9
L3+
Positive pole of
the thermocouple
of channel 3
19
L8+
Positive pole of the
thermocouple of
channel 8
10
L3-
Negative pole of
the thermocouple
of channel 3
20
L8-
Negative pole of
the thermocouple of
channel 8
1.2 System connection
IVC-EH-4TC/8TC is applied to IVC3 series PLC systems. It can be connected
to an IVC3 series system through hard connection, that is, inserting it into the
extension interface of any extension module of the main module or system,
as shown in Figure 1-3.
After the IVC-EH-4TC/8TC module is connected to the system, its extension
interface can also be used to connect another extension module of the IVC3
series, such as the I/O extension module, VC-EH-4DA, IVC-EH-4TP, or
another IVC-EH-4TC/8TC.
The main module of an IVC3 series PLC can be extended with multiple I/O
extension modules and special function modules. The number of extension
modules depends on the power that the module can supply. For details, see
section 4.7 "Power supply specifications" in the
IVC3 Series PLC User
Manual
.
Figure 1-3 Diagram of the connection between IVC-EH-4TC/8TC analog
input modules and the main module
1.3 Wiring description
Figure 1-4 shows the user terminal wiring requirements. Pay attention to the
following seven aspects:
1. The labels
①
to
⑥
in Figure 1-4 indicate the connection that you need
to pay special attention to.
2. It is recommended that you connect the thermocouple signals by using a
shielded twisted-pair cable, and keep the cable away from power cables
or other cables that may cause electrical interference. Long
compensation cables may be easily disrupted by noise. Therefore, it is
recommended that you use compensation cables of shorter than 100 m.
Measurement errors are caused by the impedance of compensation
cables, and you can adjust the characteristic of each channel to eliminate
the errors. For details, see section 3 "Characteristic setting".
3. If too much electrical interference is caused, connect the shielding
ground to the ground terminal PG of the module.
4. Ground the ground terminal PG of the module properly.
5. The auxiliary 24 V DC output power supply or any other power supply
that meets requirements can be used as the analog power supply.
6. Short-circuit the positive and negative terminals that do not use a
channel to prevent the detection of error data on the channel.
7. If multiple thermocouples need to be connected to the shielding ground,
you can extend the module with external terminals.