The working process of the programmable controller of three stages

The working process of the programmable controller of the following three stages: ( 1) Input processing before the program execution, programmable controller of all input terminal on/off state of reading input image register. In program execution, even if the input state changes, the content of the input image register is the same. Until the next scan cycle input processing phase read in this change. In addition, the input contact from tong ( ) To break ( 关闭) Or cut from 关闭) To pass ( ) To change in a certain state, input filter and a response delay time ( About 10 ms) 。 ( 2) Process corresponding to the user program memory stored instruction, from the input image and other soft component image registers will be on/off state read about soft components, start from zero sequence of operations, each time the results are written on the image of the register, as a result, the soft components ( Except for X) The image of the contents of the registers with the execution of the program in the constantly changing. The interior of the output relay contact action is decided by the content of the output image register. ( 3) All output processing instruction execution is completed, the on/off state of the output image register to the output latch register transfer, become the real output of PLC controller. Programmable controller of the external output motion of soft contact to output element has a response time, want to have a delay to action.
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