The working process of PLC program execution of surface grinders and CNC grinders such as grinders, tool grinders, precision grinders and other surface grinders manufactured by PLC surface grinder manufacturers.

The cyclic scanning process of the user program can be divided into three stages: input sampling, program execution, and output refresh.
1. Input sampling stage
PLC reads and stores the signal states of all input interfaces in the input image register through the input interface, that is, refreshes the original state of all input signals. Then transfer to the program execution stage, even if the input state changes at this time, the content of the input image register will not change. PLC surface grinder manufacturers tell you that changes in input state can only be re-read in the input sampling phase of the next work cycle.
2. Program execution stage
The PLC scans the user program of the grinder, tool grinder, precision grinder and other surface grinders and CNC grinders manufactured by the grinder manufacturer. According to the state of the input signal of this cycle and the state of the output signal of the previous cycle, the user program is scanned one by one, and the corresponding Logical or arithmetic operation, and the result of the operation is stored in a special register. The manufacturer of the PLC surface grinder tells you that if the program output command is executed, the corresponding operation result will be stored in the output image register.
3. Output refresh stage
After all instructions are executed, the state in the output image register is the state to be output, which is dumped into the output buffer in the output refresh stage, and then the refreshed output buffer state of each output point is passed through the output interface circuit All are sent to the output terminal of the PLC, which is the actual output of the PLC.
PLC surface grinders, tool grinders, precision grinders and other surface grinders and CNC grinders manufactured by PLC surface grinder manufacturers perform the above three steps periodically, and this working method is called scanning mode. The time it takes to perform one cycle of the above three steps is called a scan cycle. PLC scan cycle is one of the important parameters of PLC, which reflects the sensitivity or hysteresis of PLC to the input signal. Generally, industrial control requires that the PLC scan cycle of surface grinders such as grinders, tool grinders, precision grinders, and CNC grinders manufactured by PLC surface grinder manufacturers is below 30-60ms.