According to the chart of the three-phase ac motor and reversing control of main circuit, design a control system of PLC controller
control motor is stopped.
Control requirements are as follows:
Under normal circumstances, press the start button SB1, motor forward, reverse start button SB2, motor reversal.
After motor start, press the stop button SB3 and wait for 5 seconds later, can change the direction of rotation of the motor;
If the SB1 and SB2 press at the same time, the motor stop running, and don't start, at the same time alarm light L1 on 1 second dark flashing 1 SEC.
Press SB3 stop button to reset at this time.
first we confirm button, use the auxiliary contact situation of KM, there is a positive &negative main circuit, main circuit must have an interlock circuit, the other button with normally open contacts.
it's PLC controller
input and output point table: according to the question (
Programming: according to the question 1 here, and just over two since the hold circuit can be.
the question 2 for 5 seconds press the stop button to change the direction of motor, so there should be a flag bit in the set, here use M0.
and interlock circuit and program, specific as follows: in the first two since added to keep the loop interlock circuit -
Networks 1 Q0.
1 normally closed point, Q0 and network 2.
0 normally closed.
Question 2 say 5 seconds after press the stop button, can press the start button, so the network 3 press I0.
2 after the stop button, M0.
0 to keep, timer T37 timing after 5 s, M0.
0 loop since hold off.
And M0 are added into the network 1 and 2.
0 normally closed point, M0.
0 to electric network 1 and 2 even when pressing the forward button or reverse button didn't make Q0.
0 or Q0.
1 have to electricity.
the question 3 for SB1 and SB2 press at the same time, the motor stop running, and don't start, at the same time, the alarm light L1 on 1 second dark flashing 1 SEC.
Programming is as follows: this 4/5/6 increased network, network 5 and 6 is to use two timer to produce a small program for a second pulse, SM0.
0 for special, its function is always have electricity.
Networks are 4 using M0.
1 will network 1/2/3 lock, that is to say, M0.
1 have to electric network.
3 is not effective.
A summary on its principle and M0.
above all the programming is the instance.
Is the so-called great oaks grow from little acorns, if you call small make up a breath made up, small make up also is very difficult.
However, the question a little break up, a little to write the function of the required, finally certainly can satisfy your heart.
Finally you see make up the program and the initial difference how much programmable control systems
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