1. Introduction
The ComWinTop CWT-TM-16PT is a high-performance 16-channel temperature acquisition module designed for industrial applications. It supports PT100 and PT1000 resistance temperature detectors (RTDs) and communicates via RS485 using the Modbus RTU protocol. This module offers reliable and accurate temperature measurement with isolation design, making it suitable for various monitoring and control systems.
2. Safety Information
Please read and understand all safety instructions before installing or operating this device. Failure to follow these instructions may result in equipment damage, personal injury, or improper operation.
- Ensure the power supply voltage is within the specified range (DC8~30V).
- Disconnect power before making any wiring connections or performing maintenance.
- All wiring should be performed by qualified personnel in accordance with local electrical codes.
- Avoid exposing the module to extreme temperatures, humidity, or corrosive environments.
- Do not attempt to open or modify the module, as this will void the warranty and may cause damage.
3. Package Contents
Upon receiving your ComWinTop CWT-TM-16PT module, please verify that the following item is included:
- 1 x CWT-TM-16PT Temperature Acquisition Module
For a detailed user manual in PDF format, please refer to the official documentation: User Manual (PDF)
4. Specifications
4.1 Basic Parameters
| Parameter | Value |
|---|---|
| Power supply | DC8~30V |
| Power consumption | 9mA@30V, 12mA@24V, 23mA@12V, 33mA@8V |
| Input sensor type | PT100 or PT1000 |
| Measure range | -180°C ~ +650°C |
| Resolution | 0.1°C |
| Accuracy | 0.25°C |
| Input connections | Supports two and three wire connections, disconnection and short circuit detection |
| Output | RS485 (Modbus RTU protocol), isolation design |
| Working environment | -30~+55°C / 0-95%RH |
| Material | ABS |
| Mounting type | 35mm Din-rail |
| Dimensions | 88*72*59mm (L*W*H) |
5. Setup
5.1 Physical Installation
The module is designed for 35mm DIN-rail mounting. Securely attach the module to a standard DIN-rail in your control cabinet.
5.2 Terminal Description
Refer to the table below for the function of each terminal on the module:
| Terminals | Description |
|---|---|
| +V | Power + |
| GND | Power - |
| RTDx+ | PT100/1000 + |
| RTDx- | PT100/1000 - |
| GND | PT100/1000 GND |
| A (D+) | RS485 + |
| B (D-) | RS485 - |
5.3 Power Supply Connection
Connect a DC power supply (8V to 30V) to the +V and GND terminals. Ensure correct polarity.
5.4 Sensor Wiring (PT100/PT1000)
The module supports both two-wire and three-wire connections for PT100/PT1000 sensors. Refer to the diagram below for proper wiring.
5.5 RS485 Communication Wiring
Connect the RS485 communication lines to the A (D+) and B (D-) terminals. Ensure proper polarity for communication.
6. Operating Instructions
The module communicates using the Modbus RTU protocol over RS485. Default communication parameters are 9600 baud, N (None) parity, 8 data bits, and 1 stop bit (9600,n,8,1). The default device address is 1.
6.1 Modbus Register Map - Parameter Configuration
Use Function Code 03H (read) or 06H (write) to configure communication parameters and the device address.
| Address (hex) | Byte order | Meaning | Description | Property |
|---|---|---|---|---|
| 10 | LO | Communication parameters | BIT<7:5> reserve BIT<4:3> 00=none 01=even 10=odd (11=odd) BIT<2:0> 000=9600 001=1200 010=2400 011=4800 100=9600 101=14400 110=19200 initial value: 00 |
RW |
| Hi | address | 1-250 initial value: 01 |
RW |
6.2 Modbus Register Map - Data Acquisition
Use Function Code 03H (read) to acquire temperature data from the channels.
| Address (hex) | Description | Format | Number of bytes | Property |
|---|---|---|---|---|
| 40H | Channel 1 | Float | 4 | R |
| 42H | Channel 2 | 4 | R | |
| 44H | Channel 3 | 4 | R | |
| 46H | Channel 4 | 4 | R | |
| 48H | Channel 5 | 4 | R | |
| 4AH | Channel 6 | 4 | R | |
| 4CH | Channel 7 | 4 | R | |
| 4EH | Channel 8 | 4 | R | |
| 50H | Channel 9 | 4 | R | |
| 52H | Channel 10 | 4 | R | |
| 54H | Channel 11 | 4 | R | |
| 56H | Channel 12 | 4 | R | |
| 58H | Channel 13 | 4 | R | |
| 5AH | Channel 14 | 4 | R | |
| 5CH | Channel 15 | 4 | R | |
| 5EH | Channel 16 | 4 | R | |
| 20H | Channel 1 | UINT Scale: 0.1 |
2 | R |
| 21H | Channel 2 | 2 | R | |
| 22H | Channel 3 | 2 | R | |
| 23H | Channel 4 | 2 | R | |
| 24H | Channel 5 | 2 | R | |
| 25H | Channel 6 | 2 | R | |
| 26H | Channel 7 | 2 | R | |
| 27H | Channel 8 | 2 | R | |
| 28H | Channel 9 | 2 | R | |
| 29H | Channel 10 | 2 | R | |
| 2AH | Channel 11 | 2 | R | |
| 2BH | Channel 12 | 2 | R | |
| 2CH | Channel 13 | 2 | R | |
| 2DH | Channel 14 | 2 | R | |
| 2EH | Channel 15 | 2 | R | |
| 2FH | Channel 16 | 2 | R |
6.3 Configuration Tool
A dedicated configuration tool is provided to simplify the setup and testing of the module. This tool allows you to read and write Modbus parameters, and view acquired data.
7. Maintenance
- Keep the module clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Ensure proper ventilation around the module to prevent overheating.
- Regularly check wiring connections for tightness and signs of corrosion.
- Inspect the module periodically for any physical damage.
8. Troubleshooting
8.1 No Power Indication
- Check the power supply voltage and ensure it is within the DC8~30V range.
- Verify that the +V and GND connections are correct and secure.
- Ensure the power supply is functioning correctly.
8.2 Incorrect Temperature Readings
- Verify that the correct sensor type (PT100 or PT1000) is selected in your Modbus master configuration.
- Check the sensor wiring for correct two-wire or three-wire connection as per Figure 4.
- Inspect sensor cables for damage or short circuits.
- Ensure the sensor is properly installed in the measurement environment.
8.3 Communication Errors (RS485)
- Check the RS485 A (D+) and B (D-) wiring for correct polarity and secure connections.
- Verify that the Modbus communication parameters (baud rate, parity, data bits, stop bits) on the module and your Modbus master match. Default: 9600, N, 8, 1.
- Ensure the Modbus device address configured in your master matches the module's address (default: 1).
- Check for proper termination resistors on the RS485 bus if necessary.
9. User Tips
- Remote Monitoring: This device, with its RS485 Modbus output, is suitable for integration into systems requiring remote temperature monitoring and control, such as in multiple tanks or industrial processes. You would typically connect it to a Modbus master (e.g., PLC, HMI, or a gateway to a cloud platform) that can handle remote access and control logic.
- Configuration Tool: Utilize the provided configuration tool for initial setup and testing to ensure all communication parameters are correctly set before integrating into a larger system.
10. Warranty and Support
For warranty information and technical support, please contact your vendor or the manufacturer directly. Keep your purchase receipt for any warranty claims.
11. Frequently Asked Questions (FAQ)
- Q: Where can I find the user manual for this product?
- A: The user manual is available in PDF format. A link is provided in the 'Package Contents' section of this document.
- Q: Can this device be used for remote temperature control in multiple tanks?
- A: Yes, this module is suitable for such applications. Its RS485 Modbus output allows integration with a Modbus master system, which can then provide remote access for viewing and potentially altering temperature setpoints or control parameters, depending on the overall system design.