One of the most simple of PLC program for beginners - a program

This program is one of the most simple Siemens s7200 PLC program, the most simple program, into the most the most the most simple single parts. Because it is the basis of PLC programming, be sure to understand. Mr, not must be must be.

figure 1 as shown in figure 1, is the use of the PLC controller program normally open contacts within ( You notice that I said is normally open contacts within the PLC program, not external normally open button, everyone don't mixed up) , without external normally open button press, Q0. 1 there is no output, because the I0. 0 no through. If the external normally open button, Q0. 1 there is output, because the I0. 0 on the ( To connect PLC controller program, green, red for output) 。 The best understanding.

figure 2 in figure 2, the program normally open contacts within another usage, if the external joint is normally closed button, can achieve the same control Q0. The output of 1. When an external normally closed when there is no press the button, I0. 0 is pass, so Q0. 1 there is output. If the external normal close button, Q0. 1 there is no output, because the I0. 0 no ( To connect PLC controller program, green, red for output) 。 It can also understand this.

figure 3, is the use of the normally closed contact inside the program, if the outside is normally open button, when there is no press, I0. 5 is pass, so Q0. 1 there is output ( To connect PLC program, green, red for output) 。 If the external normally open button, Q0. 1 there is no output, because the I0. 5 no ( Note that although normally closed contacts within the I0 program. Among 5 a slash, but that's just said it is a normally closed contact, doesn't mean that it is) 。 This though is not too easy to understand, but re-read it can understand.

figure 4, figure 4 is a program within the normally closed contact of another kind of usage, if the external joint is normally closed button, when there is no press, I0. 5 is blocked, so Q0. 1 there is no output. If the external normal close button, Q0. 1 there is output, because the I0. 5. This is a little difficult. But I tell you a word you can basically know about, the normally open contacts inside the program, give it a signal it through. Normally closed contact, give it a signal it will disconnect. This signal is normally open or normally closed our external button. Want to also don't understand, rote learning, if I can remember is also can be programmed.

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