Mitsubishi PLC clock comparison example - Database & Sql Blog Articles

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The TCMP instruction is commonly used in control programs to manage time-based outputs. For example, if you need to control three outputs—Y0, Y1, and Y2—at different times, the TCMP command helps compare the current time with set values. When X0 is activated, the MOV command transfers time data from D3 to D4, D5, and then to D10, D11, and D12. The TCMP instruction compares the current time with set values K8, K20, and K25 (which represent 8, 20, and 25 seconds respectively). Depending on the comparison result, specific outputs are triggered or reset. If the current time is less than the set time, M10 turns on, which sets Y0 and resets Y2. When the current time matches the set time, M11 activates, setting Y1 and resetting Y0. If the current time exceeds the set time, M12 becomes active, setting Y2 and resetting Y1. This type of logic is widely used in applications that require precise timing control, such as automated systems, industrial processes, and real-time control setups. Understanding how to implement these instructions can greatly improve your ability to design efficient and accurate control programs.