plc cpu modules periodically reads the state of the input device, and sends the data to the output device. State of the real world inputs sensed input system (switch, horizontal, etc.), and converts them into values can be used by the CPU, and these values are written to the input table. Application is executed, and the value is written to the output table. Then converted to real-world change in the output value of the output of the system (when the motor is switched on, the valve is opened, etc.)
plc
2014年7月31日星期四
The basic scanning of plc cpu
Once the program in the CPU - the PLC and then set to "run" with the application plc module repeated. In addition to executing the program,
plc cpu modules periodically reads the state of the input device, and sends the data to the output device. State of the real world inputs sensed input system (switch, horizontal, etc.), and converts them into values can be used by the CPU, and these values are written to the input table. Application is executed, and the value is written to the output table. Then converted to real-world change in the output value of the output of the system (when the motor is switched on, the valve is opened, etc.)
plc cpu modules periodically reads the state of the input device, and sends the data to the output device. State of the real world inputs sensed input system (switch, horizontal, etc.), and converts them into values can be used by the CPU, and these values are written to the input table. Application is executed, and the value is written to the output table. Then converted to real-world change in the output value of the output of the system (when the motor is switched on, the valve is opened, etc.)
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