For large PLC tasks, the following steps can be taken for task breakdown:
1) Determine the task objectives: Clarify the overall goals and needs of the large-scale tasks. Understand the characteristics and requirements of the process or equipment to be controlled, and clarify the functions and control logic that need to be implemented.
2) Divide functional modules: According to the complexity and functional requirements of the task, divide the task into multiple functional modules. Each function module represents an independent function or subtask.
3) Determine the dependency between modules: Determine the dependency and data flow relationship between each functional module. Determine which modules need to be completed before other modules can be completed, and which modules need to share data or results.
4) Assign priority and time requirements: Assign priority and time requirements to each functional module. According to the urgency, importance and dependency of the task, determine the execution sequence and time requirements of each module.
5) Allocation of resources: Reasonable allocation of human, time and material resources according to the complexity and workload of functional modules. Ensure that each functional module is supported by the appropriate resources to ensure the smooth progress of the task.
6) Write module programs: For each functional module, write the corresponding PLC program. According to the functional requirements and control logic, write appropriate logic, conditional statements and function blocks to achieve the required functions and controls.
7) Independent testing and debugging: For each functional module, independent testing and debugging are carried out. Verify that the functions and logic of each module are correct, and make necessary adjustments and corrections.