works it is well known that the PLC
works as follows: circulation scanning: from the head end to the end end of the program, from left to right side, progressive scan, again and again!
a line looks very simple, also is easy to understand, but in the actual programming errors, this is because the foundation is not solid.
The cycle of the PLC scan specific is how it works?
We can refer to a binary frequency circuit is introduced.
Binary frequency circuit what is binary frequency circuit, a simple example: the lighting and extinguishing of a button in a light bulb, first press the button, the light bulb, the second bulb out, press the button that is binary frequency circuit!
binary frequency circuit implementation are many ways, in order to better reflect the theme of this issue,
The PLC works)
, will use the basic logic instruction to write, detail see below;
Among them: button -
X0, light -
PLC cycle scanning process words, more detailed than a picture: don't understand it doesn't matter, here are isolations the following four figure to explain, first press the button to release -
figure 1, the button before the program status figure 2, button, PLC controller
of the first scan cycle figure 3, button, (
Second, PLC controller scan cycle (
Hypothesis is the second, scanning cycle quickly)
figure 4, after the release of program state the following four figure to explain, second press the button to release process -
Lights go out.
figure 1, the second press the button before the program status figure 2 second, button press, PLC of the first scan cycle figure 3, button according to the end, for the second time,
Second, PLC scan cycle figure 4, after the release of program state
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