INVT IVC-EH-4PT User manual

IVC-EH-4PT Resistance-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-4PT 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-4PT 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-4PT 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-4PT user terminals.
Table 1-1 Definition of IVC-EH-4PT user terminals
SN
Label
Description
SN
Label
Description
1
24V+
Positive pole of the 24 V
analog power supply 11 R2–
Negative input terminal of
thermistor signals of
channel 2
2
24V–
Negative pole of the 24 V
analog power supply 12 I2–
Auxiliary negative input
terminal of thermistor
signals of channel 2
3
. Empty pin 13 R3+
Positive input terminal of
thermistor signals of
channel 3
4
PG Ground terminal 14 I3+
Auxiliary positive input
terminal of thermistor
signals of channel 3
5
R1+
Positive input terminal of
thermistor signals of
channel 1
15 R3–
Negative input terminal of
thermistor signals of
channel 3
6
I1+
Auxiliary positive input
terminal of thermistor
signals of channel 1
16 I3–
Auxiliary negative input
terminal of thermistor
signals of channel 3
SN
Label
Description
SN
Label
Description
7
R1–
Negative input terminal of
thermistor signals of
channel 1
17 R4+
Positive input terminal of
thermistor signals of
channel 4
8
I1–
Auxiliary negative input
terminal of thermistor
signals of channel 1
18 I4+
Auxiliary positive input
terminal of thermistor
signals of channel 4
9
R2+
Positive input terminal of
thermistor signals of
channel 2
19 R4-
Negative input terminal of
thermistor signals of
channel 4
10
I2+
Auxiliary positive input
terminal of thermistor
signals of channel 2
20 I4-
Auxiliary negative input
terminal of thermistor
signals of channel 4
1.2 System connection
IVC-EH-4PT 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-4PT 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-4PT.
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-4PT 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 ⑤ in Figure 1-4 indicate the connection that you need
to pay special attention to.
2. It is recommended that you connect the thermistor signals by using a
shielded twisted-pair cable, and keep the cable away from power cables
or other cables that may cause electrical interference. The connection of
a thermistor is described as follows:
(1) For thermistor sensors of the Pt100, Cu100, and Cu50 types, you
can use the 2-wire, 3-wire, and 4-wire connection methods.
Among them, the precision of the 4-wire connection method is the
highest, that of the 3-wire connection method is the second
highest, and that of the 2-wire connection method is the lowest. If
the length of the wire is longer than 10 m, it is recommended that
you use the 4-wire connection method to eliminate the resistance
error caused by the wire.
(2) To reduce measurement errors and prevent noise interference, it
is recommended that you use connection cables that are shorter
than 100 m. Measurement errors are caused by the impedance of
connection cables and may be different on different channels of
the same module. Therefore, you need to adjust the characteristic
of each channel. 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. Do not use the empty pin of the user terminal.
PGND
Figure 1-4 IVC-EH-4PT user terminal wiring diagram
2 Instructions
2.1 Power supply specifications
Table 2-1 Power supply specifications
Item Specification
Analog
circuit
24 V DC (-15%–+20%); Max. allowable ripple voltage: 5%;
55 mA (supplied by the main module or external power
supply)
Digital
circuit 5 V DC, 72 mA (supplied by the main module)
2.2 Performance specifications
Item
Specification
Degrees Celsius (°C) Degrees Fahrenheit (°F)
Input signal Termistor type: Pt100, Cu100, Cu50
Number of channels: 4
Converting
speed
(15±2%) ms × 4 channels (The conversion is not perfor
med
for unused channels.)
Rated
temperature
range
Pt100
–150°C–+600°C
Pt100 –238°F–+1112°F
Cu100
–30°C–+120°C
Cu100
–22°F–+248°F
Cu50 –30°C–+120°C
Cu50 –22°F–+248°F
Digial output
16-bit A/D conversion. The temperature value is stored in
16-bit binary complement code.
Pt100
–1500–+6000 Pt100 –2380–+11120
Cu100
–300–+1200 Cu100
–220–+2480
Cu50 –300–+1200 Cu50 –220–+2480
Lowest
resolution
Pt100
0.2°C Pt100 0.36°F
Cu100
0.2°C Cu100
0.36°F
Cu50 0.2°C Cu50 0.36°F
Precidion ±1% of the full range
Isolation
Analog circuits are isolated from digital circuits by using
photoelectric couplers. Analog circuits are isolated from the
internal 24 V DC power supply of the module. Analog
channels are not isolated from each other.
2.3 BFM
The IVC-EH-4PT module can exchange information with the main module
through the buffer memory (BFM) in either of the following operation modes:
Mode 1
The channels and converting results are set quickly in the configuration
interfaces. This is also a common mode in which special extension modules
are set.
Mode 2
1. The main module writes information to the BFM of IVC-EH-4PT through
TO instructions to set IVC-EH-4PT.
2. The main module reads the PT converting results of IVC-EH-4PT and
other information in the BFM through FROM instructions.
Table 2-3 describes the information in the BFM of IVC-EH-4PT.
Table 2-3 Information in the BFM of IVC-EH-4PT
BFM Information Default value
*#100
Average value of channel 1 0
*#101
Average value of channel 2 0
*#102
Average value of channel 3 0
*#103
Average value of channel 4 0
#200
Current value of channel 1 0
#201
Current value of channel 2 0
#202
Current value of channel 3 0
#203
Current value of channel 4 0
#300
Module fault state word 0X0000
#400
Initialization instruction Default value: 0
#500
Setting modification allowing
instruction
Default value: 1 (modification
allowed)
#700
Channel 1 mode word 0x0000
#701
Channel 2 mode word 0x0000
#702
Channel 3 mode word 0x0000
#703
Channel 4 mode word 0x0000
#800
Number of points of channel 1
average value 8(1-4096)
#801
Number of points of channel 2
average value 8(1-4096)
#802
Number of points of channel 3
average value 8(1-4096)
#803
Number of points of channel 4
average value 8(1-4096)
*#900
CH1-D0 0 (input mode 0)
#901
CH1-A0 0 (input mode 0)
*#902
CH1-D1 10000 (input mode 0)
#903
CH1-A1 10000 (input mode 0)
*#904
CH2-D0 0 (input mode 0)
#905
CH2-A0 0 (input mode 0)
*#906
CH2-D1 10000 (input mode 0)
#907
CH2-A1 10000 (input mode 0)
*#908
CH3-D0 0 (input mode 0)
#909
CH3-A0 0 (input mode 0)
*#910
CH3-D1 10000 (input mode 0)
#911
CH3-A1 10000 (input mode 0)
*#912
CH4-D0 0 (input mode 0)
#913
CH4-A0 0 (input mode 0)
*#914
CH4-D1 10000 (input mode 0)
#915
CH4-A1 10000 (input mode 0)
#4094
Module software version
information 0X1000
#4095
Module identification code 0X5042
Description:
1. Only for buffers with the asterisk (*), the main module can write
information to the BFM of IVC-EH-4PT through TO instructions and read
information of any unit in the BFM through FROM instructions. If the main
module reads information from a reserved unit, the value 0 is obtained.
2. The input mode depends on the value of BFM#700. #700 determines
control channel 1, #701 determines control channel 2, #702 determines
control channel 3, and #703 determines control channel 4. Table 2-4
describes the meaning of the values of the characters.

Table 2-4 BFM#700 information table
SN
BFM#700 Corresponding digial value
1 0 Channel disabled
2 1 Pt100 thermistor (-150°C–+600°C), digital unit: 0.1°C
3 2 Pt100 thermistor (-238°F–+1112°F), digital unit:
0.1°F
4 3 Cu100 thermistor (-30°C–+120°C), digital unit: 0.1°C
5 4 Cu100 thermistor (-22°F–+248°F), digital unit: 0.1°F
6 5 Cu50 thermistor (-30°C–+120°C), digital unit: 0.1°C
7 6 Cu50 thermistor (-22°F–+248°F), digital unit: 0.1°F
For example, if "0x0001" is written into the #700 unit, the following
information is set:
Channel mode of channel 1: Pt100 thermistor (-150°C–+600°C), digital
unit: 0.1°C
3. The units BFM#800 to BFM#803 are the setting buffer memory for the
average number of channel sampling times. The value ranges from 1 to
4096, and the default value 8 indicates that the average number of
channel sampling times is 8.
4. The units BFM#900 to BFM#915 are buffers for channel characteristic
settings, and channel characteristics are set in two-point mode. D0 and
D1 indicate the digital output (in the unit of 0.1°C) of the channel, A0 and
A1 indicate the actual input (in the unit of 0.1°C) of the channel, and each
channel uses 4 words. To simplify the setting of users without affecting
the implementation of functions, the values of A0 and A1 are fixed to 0
and the maximum value of the analog in the applied mode. The values
change with the modification of channel mode words (such as BFM#700).
Users cannot modify these two items.
Note: The values of all the characteristic parameters are in the unit of
0.1°C. For values in the unit of °F, convert them into values in °C based
on the following expression before writing them into the characteristic
setting:
Temperature value (°C)=5/9×[Temperature value (°F)-32]
For how the channel characteristics change with the modification of D0,
A0, D1, and A1, see chapter 3 "Characteristic setting".
5. For state information of BFM#300, see Table 2-5.
Table 2-5 State information of BFM#300
Bit state of
BFM#300 ON OFF
b0: Error
If anly of the bit states b1 to b2 is on,
PT conversion of all channels is
stopped.
No error
b1: Channel
characteristic setting
error
Exceptions occur in the channel
characteristic data in the BFM or
adjustment errors occur.
The channel
characteristic
data is
normal.
b2: Power supply
fault 24 V DC power supply fault
The power
supply works
properly.
6. When BFM#400 is set to 1, that is, when it is activated, all the settings of
the module are reset to the default values.
7. BFM#500 is used to disable the modification of the I/O characteristic.
After BFM#500 is set to 0, you cannot modify the I/O characteristic until
BFM#500 is set to 1. The setting is saved at power outage.
8. BFM#4094 contains the module software version information. You can
use the FROM instruction to read the information.
9. BFM#4095 contains the module identification code. The identification
code of IVC-EH-4PT is 0X5042. User programs on the PLC can use this
code to identify the special module IVC-EH-4PT before transmitting or
receiving data.
3 Characteristic setting
The input channel characteristic of IVC-EH-4PT is the linear relationship
between the analog input A and digital output D of the channel. You can set
the characteristic. Each channel can be understood as the model shown in
Figure 3-1. Since it is linear, the characteristic of a channel can be
determined by identifying two points, P0 (A0, D0) and P1 (A1, D1). D0
indicates the channel digital output when the analog input is A0, and D1
indicates the channel digital output when the analog input is A1.
Figure 3-1 Channel characteristic of IVC-EH-4PT
Measurement errors are caused by the impedance of connection cables.
Therefore, you can eliminate this type of errors by setting channel
characteristics.
To simplify the setting of users without affecting the implementation of
functions, the values of A0 and A1 are fixed to 0 and 6000 (in the unit of
0.1°C) in the applied mode, that is, in Figure 3-1, A0 is 0.0°C and A1 is
600.0°C. Users cannot modify these two items.
If you do not modify D0 and D1 of each channel and only set the channel
mode (BFM#700), the characteristic of each mode is the default one, as
shown in Figure 3-2.
Note: When the channel mode is set to 2, 4, or 6, that is, the output is in the
unit of 0.1°F, the temperature values read in the output area (BFM#100–#103
and BFM#200–#203) are in the unit of 0.1°F, but the data in the channel
characteristic setting area (BFM#900–#915) is still in the unit of 0.1°C. Keep
this in mind when modifying the values of D0 and D1.
If D0 and D1 of a channel are modified, the characteristic of the channel is
changed. D0 can be set to any value ranging from -1000 to +1000 (in the unit
of 0.1°C), and D1 can be set to that ranging from 5000 to 7000 (in the unit of
0.1°C). If the setting exceeds the range, IVC-EH-4PT does not receive the
setting and keep the original valid setting.
If the value measured by IVC-EH-4PT in practice is 5°C (41°F) higher, you
can eliminate the error by setting the two adjustment points P0 (0, -50) and
P1 (6000,5950), as shown in Figure 3-3.
Figure 3-
2 Default channel
characteristic of each mode when D0
and D1 are not modified
Figure 3-3 Characteristic
modification instance
4 Application instance
4.1 Configuring the extension module
through the configuration interface
In the following example, IVC-EH-4PT is connected to the No.0 position of
the extension module. It is connected to a Pt100 thermistor through channel
1 to output temperature values (°C), to a Cu100 thermistor through channel 2
to output temperature values (°C), and to a Cu50 thermistor through channel
3 to output temperature values (°F). Channel 4 is disabled, and the number of
points of channel average value is set to 4. Data registers D1, D3, and D5 are
used to receive the conversion results of the average values. Figure 4-1 to
Figure 4-3 show the setting method. For more details, see the IVC Series
PLC Programming Reference Manual.
You can configure registers directly in the provided extension module
configuration interface instead of using FROM and TO instructions. The
configuration steps are as follows:
1. Double-click the extension module configuration tab in the System block
category on Project Manager.
2. Double-click the module to be configured on the right instruction tree to
add it to the configuration.

3. After configuring all the parameters, click OK to complete the
configuration.
After the configuration is complete, the user program needs only to use
the configured D element to communicate with the special function
module instead of using FROM and TO instructions. After the compiling
is verified, the system block is downloaded to the main module with the
user program. Figure 4-1 shows the configuration interface.
Figure4-1 Setting of basic application channel 1
Figure 4-2 Setting of basic application channel 2
Figure 4-3 Setting of basic application channel 3
4.2 Configuring the extension module through
instructions
Example: The address of the IVC-EH-4PT module is 3 (for the addressing
method of special function modules, see the IVC-EH-4PT Series PLC User
Manual), and the number of points of the average values is 8 by default. The
following figure shows the modification of the characteristic shown in Figure
3-3 (when the value measured by IVC-EH-4PT is 5°C higher, that is, 41°F
higher, in practice). Channel 1 is used to connected to a Pt100 thermistor to
output temperature values (°C), channel 2 is used to connect to a Cu100
thermistor to output temperature values (°C), channel 3 is used to connect to
a Cu50 thermistor to output temperature values (°F), and channel 4 is
disabled. In this case, the output of channel 1 is 6000 if the actual measured
temperature is 600°C, the output of channel 2 is 1200 if the actual measured
temperature is 120°C, and the output of channel 3 is 2480 if the actual
measured temperature is 248°F. The data registers D2, D3, and D4 are used
to receive the conversion results of the average values.
5 Running inspection
5.1 Routine inspection
1. Check whether the wiring of the analog input meets the requirements.
Refer to section 1.3 "Wiring description".
2. Check whether IVC-EH-4PT is firmly inserted into the extension
interface.
3. Check whether the 5 V and 24 V power supplies are overloaded.
Note: The power of the digital part of IVC-EH-4PT is supplied by the
main module through the extension interface.
4. Check the application program and ensure that the correct operation
method and parameter range are selected in the application.
5. Set the main module of IVC-EH-4PT to the RUN state.
5.2 Fault checking
If IVC-EH-4PT does not run properly, check the following items:

• Check the state of the "POWER" indicator.
On: The extension interface is connected properly.
Off: Check the status of the extension connection and the main module.
• Check the analog wiring.
• Check the state of the "24V" indicator.
On: The 24 V DC power supply works properly.
Off: The 24 V DC power supply may be faulty. If the 24 V DC power
supply works properly, IVC-EH-4PT is faulty.
• Check the state of the "RUN" indicator.
Blinking at a high frequency: IVC-EH-4PT runs properly.
Blinking at a low frequency or off: Check the information in BFM#300.
User notice
1. The warranty covers only the PLC machine.
2. The warranty period is 18 months. We provide free-of-charge
maintenance and repairs for the product if it is faulty or damaged during
proper operation within the warranty period.
3. The warranty period starts from the ex-factory date of the product. The
machine No. is the only basis for determining whether the machine is
within the warranty period. A device without the machine No. is deemed
out-of-warranty.
4. Maintenance and repair fees are charged in the following scenarios even
the product is within the warranty period:
• Faults are caused due to misoperations. Operations are not performed
following the instructions provided in the manual.
• The machine is damaged due to causes such as fire, flood, or voltage
exceptions.
• The machine is damaged due to improper use. You use the machine to
perform some unsupported functions.
5. The service fees are calculated based on the actual fees. If there is a
contract, the provisions stated in the contract prevail.
6. Keep this warranty card. Show it to the maintenance unit when you seek
maintenance services.
7. Contact the local dealer or directly contact our company if you have any
questions.
Customer Service Center (China)
INVT Auto-Control Technology (Shenzhen) Co., Ltd.
Address: West Side, Floor 6, Building B, INVT Guangming Technology
Building, Songbai Road, Matian, Guangming District, Shenzhen,
China
Postal code: 518106
Company website: http://www.invt-control.com/en/index.html
All rights reserved. The content of this manual is subject to change without
prior notice.
Customer service center
INVT Auto-Control Technology (Shenzhen) Co., Ltd.
Product quality feedback sheet
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model Installation date
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structure
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Address: West Side, Floor 6, Building B, INVT Guangming Technology
Building, Songbai Road, Matian, Guangming District, Shenzhen,
China
Postal code: 518106