1. Introduction
This document provides essential instructions for the installation, operation, and maintenance of the CHBMSS GL20-4AD PLC Module. The GL20-4AD is a Programmable Logic Controller (PLC) module designed for industrial automation applications, featuring an independent programming port and robust anti-reverse and anti-surge power circuit design.
It is crucial to read and understand this manual completely before attempting to install or operate the device to ensure safe and efficient performance.
2. Product Overview
The CHBMSS GL20-4AD is a compact industrial processor suitable for various automation tasks. Its design emphasizes reliability and ease of integration into existing systems.

Figure 1: Packaging box for the CHBMSS GL20-4AD PLC Module. The label displays a barcode, the number "01440292", and the CE conformity mark, indicating compliance with European health, safety, and environmental protection standards.
3. Setup and Installation
Proper installation is critical for the reliable operation of the GL20-4AD module. Always ensure power is disconnected before beginning any installation procedures.
- Mounting: Securely mount the PLC module within an appropriate industrial enclosure, ensuring adequate ventilation and protection from environmental factors such as dust, moisture, and extreme temperatures.
- Power Connection: Connect the module to a stable power supply. The power circuit incorporates anti-reverse and anti-surge protection, but it is essential to verify correct voltage and polarity according to the specifications.
- Input/Output Wiring: Connect field devices to the module's input and output terminals as per your application's design. Refer to the wiring diagrams provided in the full technical documentation for specific terminal assignments.
- Programming Port: Connect your programming device (e.g., computer with PLC software) to the independent programming port.
- Grounding: Ensure the module and enclosure are properly grounded to prevent electrical interference and ensure safety.
After physical installation, proceed with software configuration and program loading.
4. Operating Instructions
Once installed and programmed, the GL20-4AD module operates autonomously based on the loaded logic. Follow these general guidelines for operation:
- Power On: Apply power to the module. Observe indicator lights for proper boot-up and operational status.
- Program Execution: The module will automatically begin executing the loaded program. Monitor system behavior to confirm correct operation.
- Monitoring: Use the programming software to monitor input/output status, internal registers, and program execution in real-time.
- Program Modification: Any changes to the PLC program should be performed by qualified personnel using the dedicated programming port. Always back up the existing program before making modifications.
- Emergency Stop: Ensure that an accessible emergency stop mechanism is in place for the entire system controlled by the PLC.
5. Maintenance
Regular maintenance helps ensure the longevity and reliability of the GL20-4AD PLC module.
- Environmental Checks: Periodically inspect the operating environment to ensure it remains within specified temperature and humidity ranges.
- Cleaning: Keep the module and its enclosure free from dust and debris. Use a soft, dry cloth for cleaning. Avoid liquid cleaners.
- Connection Integrity: Routinely check all wiring connections for tightness and signs of corrosion or damage. Re-tighten loose connections as necessary.
- Firmware Updates: Consult the manufacturer's website for any available firmware updates. Apply updates only as instructed by the manufacturer.
- Backup Programs: Regularly back up the PLC program to an external storage device.
6. Troubleshooting
This section outlines common issues and potential solutions for the GL20-4AD PLC module.
| Problem | Possible Cause | Solution |
|---|---|---|
| Module does not power on. | No power supply; incorrect wiring; faulty power supply. | Check power connections and voltage. Verify power supply functionality. Ensure correct polarity. |
| Inputs not responding. | Sensor fault; incorrect wiring; program logic error. | Verify sensor operation. Check input wiring. Review PLC program logic. |
| Outputs not activating. | Actuator fault; incorrect wiring; program logic error; overload. | Check actuator functionality. Verify output wiring. Review PLC program logic. Check for overcurrent conditions. |
| Communication error with programming software. | Incorrect cable; driver issues; port settings mismatch. | Ensure correct programming cable is used. Install/update drivers. Verify communication port settings (baud rate, etc.). |
If the problem persists after attempting these solutions, contact technical support.
7. Specifications
Key technical specifications for the CHBMSS GL20-4AD PLC Module:
- Model: GL20-4AD
- Type: PLC Programmable Controller Module
- Power Circuit: Anti-reverse and anti-surge design
- Programming Port: Independent programming port
- Package Dimensions: 1.18 x 0.79 x 0.39 inches
- Item Weight: 2.2 pounds
- Manufacturer: CHBMSS
- Number of pieces: 1
Note: Detailed electrical specifications (e.g., input voltage, current ratings, I/O types) are typically found in the full technical datasheet.
8. Warranty and Support
For warranty information, please refer to the terms and conditions provided by your point of purchase or contact CHBMSS directly. Keep your purchase receipt as proof of purchase.
For technical support, inquiries, or assistance with the CHBMSS GL20-4AD PLC Module, please contact your supplier or the manufacturer's customer service department.
Manufacturer: CHBMSS
Model Number: CHBMSS (This appears to be a generic manufacturer model number, specific module is GL20-4AD)
ASIN: B0DZ2G8W46





