IVC-EH-4AD Analog 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-4AD 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-4AD 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-4AD 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-4AD user terminals.
Table 1-1 Definition of IVC-EH-4AD user terminals
Label
Description
24V+
Positive pole of the 24 V analog power supply
24V–
Negative pole of the 24 V analog power supply
PG
Ground terminal
V1+, V2+, V3+,
V4+
Voltage signal input terminals for channels 1, 2, 3, and 4
FG
Shielding ground
I1+, I2+, I3+, I4+ Current signal input terminals for channels 1, 2, 3, and 4
VI1–, VI2–, VI3–,
VI4–
Common ground terminals for channels 1, 2, 3, and 4
·
Empty pin
Special statement:
Voltage signals and current signals of a channel cannot
be input simultaneously. To detect current signals,
short-circuit
the voltage
signal input terminal of the channel to the current signal input terminal.
1.2 System connection
IVC-EH-4AD 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-4AD 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-4TC, or
another IVC-EH-4AD.
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-4AD 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. It is recommended that you connect the analog input by using a shielded
twisted-pair cable, and keep the cable away from power cables or other
cables that may cause electrical interference.
2. If fluctuation occurs in input signals, or external cables cause electrical
interference, it is recommended that you configure a smoothing capacitor
(0.1μF to 0.47μF/25V).
3. If current input is adopted for a channel, short-circuit the voltage input
terminal of the channel to the current input terminal.
4. If too much electrical interference is caused, connect the shielding ground
FG to the ground terminal PG of the module.
5. Ground the ground terminal PG of the module properly.
6. The auxiliary 24 V DC output power supply or any other power supply that
meets requirements can be used as the analog power supply.
7. Do not use the empty pin of the user terminal.
I1 +
⑦
⑤
C H 1
⑥
2 4 V +
2 4 V -
D C /D C
c o n v e rte
r
A G N D
+5 V
-5 V
P
G
N
D
P G
IV C 2 L -4 A D
D
C
2
4
V
±
1
0
%
6
0
m
A
V 1 +
V I1 -
FG
A G ND
2 5 0
Ω
④
1 3 0 K
Ω
1 3 0 K
Ω
3 9 0 K
Ω
3 9 0 K
Ω
A G ND
C u r re n t sig n a l
I4 +
C H 4
V 4 +
V I4 -
FG
A G ND
2 5 0
Ω
1 3 0 K
Ω
1 3 0 K
Ω
3 9 0 K
Ω
3 9 0 K
Ω
A G ND
V o lta g e s ig n a l
①
②
②
③
①
Figure 1-4 IVC-EH-4AD user terminal wiring diagram
2 Instructions
2.1 Power supply specifications
Table 2-1 Power supply specifications
Item
Description
Analog circuit
24 V DC (-15%–+20%); Max. allowable ripple voltage: 5%;
50 mA (supplied by the main module or external power
supply)
Digital circuit
5 V DC, 72 mA (supplied by the main module)