invt IVC-EH-4TC Thermocouple-type Temperature Input Module User Manual

Introduction

Thanks for choosing the programmable logic controllers (PLCs) developed and produced by INVT Electric 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.

Interf ce description

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

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 of channel 1| 16| L6—| Negative pole of the thermocouple of 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

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

Wiring description

Figure 1-4 shows the user terminal wiring requirements. Pay attention to the following seven aspects:

1. The labels 0) to © 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.
4. The auxiliary 24 V DC output power supply or any other power supply that meets requirements can be used as the analog power supply.
5. Short-circuit the positive and negative terminals that do not use a channel to prevent the detection of error data on the channel.
6. If multiple thermocouples need to be connected to the shielding ground, you can extend the module with external terminals.

Figure 1-4 IVC-EH-4TC/8TC user terminal vwiring diagram

Instructions

Power supply specifications

Table 2-1 Power supply specifications

(supplied by the main module or external power supply)
Digital circuit| 5 V DC, 72 mA (supplied by the main module)

Performance specifications

Table 2-2 Performance specifications

Number of I/O
poimts| None
Input signal| Thermocouple type: K, J, E, N, T, R, S (all applicable for cahnnels), 8 channels in total
Converting
speed| (240±2%) ms x 8 channels (The conversion is not performed for unused channels.)
Rated
temperature
range| Type K| —100°C-1200°C| Type K| —148°F-2192°F
Type J| —100°C-1000°C| Type J| —148°F-1832°F
Type E| —100°C-1000°C| Type E| —148°F-1832°F
Type N| —100°C-1200°C| Type N| —148°F-2192°F
Type T| —200°C-400°C| Type T| —328°F-752°F
Type R| 0°C-1600°C| Type R| 32°F-2912°F
Type S| 0°C-1600°C| Type S| 32°F-2912°F
Digital output| 16-bit ND conversion, stored in 16-bit binary complement code
Type K| —1000-12000| Type K| —1480-21920
Type J| —1000-10000| Type J| —1480-18320
Type E| —1000-10000| Type E| —1480-18320
Type N| —1000-12000| Type N| —1480-21920
Type T| —2000-4000| Type T| —3280-7520
Type R| 0-16000| Type R| 320-29120
Type S| 0-16000| Type S| 320-29120
Lowest
resolution| Type K| 0.8°C| Type K| 1.44°F
Type J| 0.7°C| Type J| 1.26°F
Type E| 0.5°C| Type E| 0.9°F
Type N| 1°C| Type N| 1.8°F
Lowest
resolution| Type T| 0.2°C| Type T| 0.36°F
Type R| 1°C| Type R| 1.8°F
Type S| 1°C| Type S| 1.8°F
Calibration
point for the
overall
precision| ±(0.5% of the full range + 1 C) Condensation point of pure water: 0°C/32°F
Isolation| Analog circuits are isolated from digital circuits by using optocouplers. Analog circuits are isolated from the 24 V DC power supply through the DC/DC converter.

Note: You can obtain data in the unit of °C or °F by setting the corresponding
mode.

BFM

The IVC-EH-4TC/8TC 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-4TC/8TC through TO instructions to set IVC-EH-4TC/8TC.
2. The main module reads the TC converting results of IVC-EH-4TC/8TC and other information in the BFM through FROM instructions.
   Table 2-3 describes the information in the BFM of IVC-EH-4TC/8TC.

Table 2-3 Information in the BFM of IVC-EH-4TC/8TC

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
704| Channel 5 mode word| 0x0000
705| Channel 6 mode word| 0x0000
706| Channel 7 mode word| 0x0000
707| Channel 8 mode word| 0x0000
800| Number of points of channel 1 average value| 8(1-4096)
801| Number of points of channel 2 averagevalue| 8(1-4096)
802| Number of points of channel 3 average value| 8(1-4096)
803| Number of points of channel 4 averagevalue| 8(1-4096)
804| Number of points of channel 5 averagevalue| 8(1-4096)
805| Number of points of channel 6 average value| 8(1-4096)
806| Number of points of channel 7 averagevalue| 8(1-4096)
807| Number of points of channel 8 average value| 8(1-4096)

900| CH1-DO| Default value: 0

901| CH1-A0| Default value: 0
#902| CH1-D1| Default value: 12000
903| CH1-A1| Default value: 12000

904| CH2-DO| Default value: 0

905| CH2-A0| Default value: 0

906| CH2-D1| Default value: 12000

907| CH2-A1| Default value: 12000

908| CH3-DO| Default value: 0

909| CH3-A0| Default value: 0

910| CH3-D1| Default value: 12000

911| CH3-A1| Default value: 12000

912| CH4-DO| Default value: 0

913| CH4-A0| Default value: 0

914| CH4-D1| Default value: 12000

915| CH4-A1| Default value: 12000

916| CH5-DO| Default value: 0

917| CH5-A0| Default value: 0

918| CH5-D1| Default value: 12000

919| CH5-A1| Default value: 12000

920| CH6-DO| Default value: 0

921| CH6-A0| Default value: 0

922| CH6-D1| Default value: 12000

923| CH6-A1| Default value: 12000

924| CH7-DO| Default value: 0

925| CH7-A0| Default value: 0
#926| CH7-D1| Default value: 12000
927| CH7-A1| Default value: 12000
”#928| CH8-D0| Default value: 0
929| CH8-A0| Default value: 0
#930| CH8-D1| Default value: 12000
931| CH8-A1| Default value: 12000
| Temperature at the cold end (forcommissioning)| 25°C
4094| Module software version information| 0X1000
4095| Module identification code| 0X4042

Description

1. Only for buffers with the asterisk (*), the main module can write information to the BFM of IVC-EH-4TC/8TC 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

For example, if “0x0001” is written into the #700 unit, the following information is set:
Channel mode of channel 1: K-type thermocouple, digital unit: 0.1°C
(-100°C-+1200°C)

3. The units BFM#800 to BFM#807 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#931 are buffers for channel characteristic settings, and channel characteristics are set in two-point mode. DO and D1 indicate the digital output (in the unit of 0.1°C) of the channel, AO and A1 indicate the actual temperature value 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 AO and A1 are fixed to 0 and the maximum value 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)=5/9x[Temperature value (°F)-32] For how the channel characteristics change with the modification of DO, AO, 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#30

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-4TC/8TC is 0X4042. User programs on the PLC can use this code to identify the special module IVC-EH-4TC/8TC before transmitting or receiving data.

Characteristic setting

The input channel characteristic of IVC-EH-4TC/8TC 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, PO (AO, DO) and P1 (A1, D1). DO indicates the channel digital output when the analog input is AO, and D1 indicates the channel digital outout when the analog input is A1.

Figure 3-1 Channel characteristic of IVC-EH-4TC/8TC

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 AO and A1 are fixed to 0 and 12000 (in the unit of 0.1°C) in the applied mode, that is, in Figure 3-1, AO is 0.0°C and A1 is 1200.0°C. Users cannot modify these two items. If you do not modify DO 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.

Figure 3-2 Default channel characteristic of each mode when DO and D1 are not modified

Note: When the channel mode is set to 2, 4, …, D, that is, the output is in the unit of 0.1°F, the temperature values read in the output area (BFM#100-#107 and BFM#200-#207) are in the unit of 0.1°F, but the data in the channel characteristic setting area (BFM#900-#9371) is still in the unit of 0.1°C. Keep this in mind when modifying the values of DO and D1. If DO and D1 of a channel are modified, the characteristic of the channel is changed. DO and D1 can be increased or decreased by 1000 (in the unit of 0.1°C) based on the factory setting. DO 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 11000 to 13000 (in the unit of 0.1°C). If the setting exceeds the range, IVC-EH-4TC/8TC does not receive the setting and keep the original valid setting. If the value measured by IVC-EH-4TC/8TC in practice is 5°C (41°F) higher, you can eliminate the error by setting the two adjustment points PO (0, -50) and P1 (12000,11950), as shown in Figure 3-3.

Figure 3-3 Characteristic modification instance

Application instance

Configuring the extension module through the configuration interface

In the following example, IVC-EH-4TC/8TC is connected to the No.0 position of the extension module. It is connected to a K-type thermocouple through channel 1 to output temperature values (°C), to a J-type thermocouple through channel 2 to output temperature values (°C), and to a K-type thermocouple through channel 3 to output temperature values (°F). Channel 4 is disabled, and the number of points of channel average value is set to 8. 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 /VC 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

Figure4-2 Setting of basic application channel 2

Figure4-3 Setting of basic application channel 3

Configuring the extension module through instructions

Example: The address of the IVC-EH-4TC/8TC module is 3 (for the addressing method of special function modules, see the /VC-EH-4TC/8TC 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. Channel 1 is used to connected to a K-type thermocouple to output temperature values (°C), channel 2 is used to connect to a J-type thermocouple to output temperature values (°C), channel 3 is used to connect to a K-type thermocouple to output temperature values (°F), and channel 4 is used to connect to a N-type thermocouple to output temperature values (°F). The channels 4, 5, 6, 7, and 8 are disabled, the number of points of channel average values is set to 8, and the data registers D2, D3, and D4 are used to receive the conversion results of the average values.

Running inspection

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-4TC/8TC 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-4TC/8TC 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-TC to the RUN state.

Fault checking

If IVC-EH-4TC/8TC 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 “24” 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-4TC/8TC is faulty.

• Check the state of the “RUN” indicator. Blinking at a high frequency: IVC-EH-4TC/8TC 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) Shenzhen INVT Electric Co., Ltd.
Address: INVT Guangming Technology Building, Songbai Road, Matian, Guangming District, Shenzhen, China
Website: www.invt.com
All rights reserved. The contents in this document are subject to change without notice.

Customer service center Shenzhen INVT Electric Co., Ltd.

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