Thermocouple to Modbus TCP.

DAT8016

Thermocouple to Modbus TCP
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Thermocouple to Modbus TCP, mV to Modbus converter DAT3016.
• 4 fully isolated input channels for Thermocouples and mV signals.
• Supports J, K, R, S, B, E, T, N thermocouples.
• Input voltage range: -250 to +250 mV.
• Full isolation between inputs, Ethernet, and power supply up to 1500 VAC.
• Wide DC power supply range: 10–30 Vdc
• DIN Rail mountable for easy panel installation
• Ethernet 10/100BaseT communication with Modbus TCP support
• Reliable industrial-grade design for precise measurements
General Description

The DAT8016 is a high-performance 4-channel converter that fully isolates Thermocouple and mV inputs and converts them to Modbus TCP over Ethernet 10/100BaseT. Designed for industrial applications, the DAT8016 provides reliable and precise measurements for a variety of processes and equipment monitoring tasks.

This versatile device can accept inputs from a wide range of thermocouples, including J, K, R, S, B, E, T, and N types, as well as millivolt signals from -250 mV to +250 mV. Each input channel is fully isolated from the Ethernet network and power supply, providing up to 1500 VAC isolation for 1 minute, which ensures safe operation in electrically noisy environments.

The DAT8016 operates with a wide DC power supply range from 10 to 30 Vdc, making it compatible with a variety of industrial control systems. It is conveniently DIN Rail mountable, simplifying installation in control cabinets and panels.

Configuration and monitoring are easy via the Modbus TCP protocol, which allows seamless integration with SCADA systems, PLCs, or data acquisition software. The DAT8016 is ideal for applications requiring accurate temperature or mV signal conversion with full channel isolation, such as process control, laboratory measurement, or industrial automation.

The DAT8016 is an essential solution for anyone looking to convert multiple thermocouple or mV signals into digital data, while maintaining complete electrical isolation and compatibility with modern Ethernet-based control systems.

INPUT OUTPUT POWER SUPPLY
J, K, R, S, B, E, T, N, Type T/c's 25 to 25 mV. Modbus TCP Ethernet 10/100T Power Supply Voltage 14-30Vdc
-100 to 100mV. -250 to 250 mV. Reverse polarity protection 60Vdc
CURRENT CONSUMPTION CONFIGURATION ISOLATION
Between 60 and 115 mA PC Programmable Between Input/Comms/Power Supply 1500Vac.
EMC HOUSING TEMPERATURE
For Industrial environments Material self-extinguishing Operating Temperature 14°F +140°F -10°C +60°C
Immunity EN 61000-6-2 Dimensions W x H x T 4" x 4 3/4" x 3/4" Storage Temperature -40°F +185°F-40°C +85°C
Emission EN 6100-6-4 100 x 120 x 22.5 mm Humidity (non condensing) 0-90%
Weight 6 oz 160 g
DAT8016 Datasheet
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Applications
Drawings
DAT8016 User Guide
Modbus TCP Modules
Application Note

Specifications
Input:  
Channels 4 Channels.
Thermocouples J, K, R, S, B, E, T, and N.
mV -25 to 25 mV, -100 to 100mV, -250 to 250 mV.
Communication:  
Ethernet 10/100T: Modbus TCP.
Power Supply: 14 - 30 Vdc. Reverse polarity protection 60 Vdc.
Current Consumption: 60 mA Standby 115 mA Max.
Temperature rating: Operative Temperature 14°F +140°F -10°C +60°C Storage Temperature - 40°F +185°F - 40°C +85°C.
Humidity: (not condensing) 0-90%.
Housing: Material self-extinguishing.
Dimensions: W x H x T 4 3/4 x 4 x 7/8 inch, 120 x 100 x 22,5mm.
Weight: 6 oz 160 g.
EMC. For industrial environments.
Immunity: EN 61000-6-2.
Emission: EN 61000-6-4.
Isolation: Input, Each Channel, Power Supply, 1500Vac, 50Hz, 1 Minute.
Configuration: PC Configurable.
Drawings

DAT8016 Power Supply and INIT Wiring Diagram

Power Supply (18-30Vdc). Positive O Negative P.
Init Pin Q Init Gnd P
DAT8016 power supply and Init

Input Terminals

Voltage Input
Input 0 Positive 1 Negative 2
Input 1 Positive 5 Negative 6
Input 2 Positive 9 Negative 10
Input 3 Positive 13 Negative 14
Thermocouple Input
Input 0 Positive 1 Negative 2
Input 1 Positive 5 Negative 6
Input 2 Positive 9 Negative 10
Input 3 Positive 13 Negative 14
Thermocouple to Modbus TCP, mV to Modbus TCP DAT8016.

Applications
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Application Note Modbus TCP Thermocouple input module DAT8016.
Printed Version

Set Up the DAT8016.

  1. Connect 24 Vdc to O and P.
  2. Connect CAT5 crossover cable to PC and Ethernet RJ45 Port on the DAT8016.
  3. Connect a Calibrator or short the input to 1 and 2.
  4. Power up the DAT8016 Modbus TCP Thermocouple Module.

It is extremely important to use a Cat 5 Crossover cable unless a router is used.

Thermocouple to Modbus TCP layout

To configure the DAT8016.

  1. Open your web browser.
  2. Type 192.168.1.100 into the Address bar.
  3. Click enter and the following page should be seen.
IP Address for Thermocouple to Modbus TCP device

Entering the User-name and Password.

  1. The password is Fact_user.
  2. The Password is Fact_pwd.
  3. Click Enter, Run to run the software.
Entering Password on the DAT8016 software

Select the Language.

  1. Click English.
  2. Click enter.
The device name should appear in the center of the page. You are also able to “Logout” of the DAT8016, go “home”, or go “back” to the page before, by clicking the icons on the page.
Selecting the English on the web server

How to read the Analog Input Signal.

  1. Click the Analog Input at the bottom of the page.
  2. Select the type of input being measured.
  3. Select Tc K for K type thermocouple.
  4. Click Save to save to the DAT8016.
  5. Click Read to measure the Input.
  6. Adjust the calibrator to check the range.
The input selection can be seen below.
  • 250mV.
  • J type thermocouples.
  • K type thermocouples.
  • R type thermocouples.
  • S type thermocouples.
  • T type thermocouples.
  • B type thermocouples.
  • E type thermocouples.
  • N type thermocouples.
Each input can be different and they are all isolated from each other. The red indication under Break means the input is open circuit. By clicking the “Set Same Input” button you enable all the inputs to be the same as Analog Input 0.
Setting up Thermocouple to Modbus TCP converter Selecting the correct thermocouple

Network Settings.

  1. Modify the network settings.
  2. Click Save to save the new Network settings.
The IP Address must be unique to the network.
Modbus Input module network settings

System Configuration Settings.

  1. To change the name from DAT8016 type the new name and click enter.
  2. To change the Modbus Address for the Thermocouple to Modbus TCP, change it under the ModBus Address label and click save.
  3. You can enable the Watchdog timer and set a time.
  4. Set up the watchdog event and the power-up event register.
System config file for Modbus TCP module

Software Update.

  1. Obtain new software from Datexel and save to the local machine.
  2. Enter the User_name and the password.
  3. Click upgrade and follow the prompts.
  4. The firmware version of the DAT8016 is displayed on this page.
upgrading the firmware Thermocouple Modbus TCP Device

The User_name and Password page.

  1. Enter the new User_name click save.
  2. Enter the new Password click save.
Software password for upgrading the firmware Thermocouple Modbus TCP Device
Frequently Asked Questions
What types of thermocouples does the DAT8016 support?
The DAT8016 supports J, K, R, S, B, E, T, and N type thermocouples, as well as millivolt inputs ranging from -250 mV to +250 mV.
Is the DAT8016 fully isolated?
Yes, the DAT8016 provides full isolation between input channels, Ethernet communication, and the power supply, rated up to 1500 VAC for 1 minute.
What is the input voltage range for the DAT8016?
The device accepts millivolt inputs from -250 to +250 mV. Thermocouple inputs follow standard thermocouple voltage ranges for each type.
What is the power supply requirement for the DAT8016?
The DAT8016 operates with a wide DC power supply range of 10–30 Vdc, making it suitable for various industrial setups.
How is the DAT8016 mounted?
The unit is designed for DIN Rail mounting, allowing easy installation in control panels and industrial enclosures.
Which communication protocol does the DAT8016 use?
The DAT8016 communicates using Modbus TCP over Ethernet 10/100BaseT, making it compatible with SCADA systems, PLCs, and data acquisition software.
Can the DAT8016 be used for industrial process monitoring?
Yes, it is ideal for process control, laboratory measurements, and industrial automation where multiple thermocouple or mV signals need to be monitored digitally with isolation.
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