We have supplied Heavy Truck Production Line for more than 32 years. 

Regular maintenance and upgrades of automated control systems are essential to ensure their stable operation and improve efficiency. Here are some strategies and steps:

1. **Assessment and Planning**:
   - Begin by assessing the existing automated control system, identifying the need for modification, and clarifying project objectives, scope, and constraints.
   - Conduct a feasibility study to check the lifespan of the control panels, which typically need to be replaced gradually after about 15 years from the installation date due to potential urgent plans.

2. **Design and Program Formulation**:
   - Based on the needs analysis, develop a detailed plan for the new system, ensuring integration with existing machinery and networks, and formulate migration strategies.
   - Choose appropriate hardware devices, programming logic, communication protocols, etc.

3. **Backup and Safety Measures**:
   - Back up all programs, data, and documentation in the current system and develop a recovery plan.
   - Prepare necessary safety measures for the installation site and schedule downtime as needed.

4. **Hardware Procurement and Replacement**:
   - Procure new PLCs and any other hardware, ensuring compatibility and availability.
   - Decommission the old PLC system and install the new PLC and related hardware.

5. **Program Logic and Testing**:
   - Transfer or rewrite the program logic to the new PLC and test all functions and communications.
   - Conduct comprehensive testing of the new system, verify its performance, and make necessary adjustments.

6. **Training and Documentation Update**:
   - Train personnel in the operation and maintenance of the new system and update or create system documentation.

7. **Switching and Monitoring**:
   - Officially switch to the new PLC system, closely monitor issues, and provide necessary support.

8. **Maintenance and Upgrades**:
   - After the system is operational, regularly perform operational monitoring and maintenance, including troubleshooting, preventive maintenance, and updates.

9. **Post-Implementation Review**:
   - Conduct a post-implementation review to assess the completion of the project, document lessons learned, and plan for future maintenance or upgrades.

10. **Routine Maintenance**:
    - Establish a routine maintenance and upkeep system for the instrument and automation control system, including regular checks of the instrument's appearance, display, alarms, and control functions, as well as the connection status of sensors and signal wires.

By following these steps, you can ensure the stable operation of automated control systems and adapt to technological developments and changes in production needs.