PLC programming seven basic principles should be paid attention to

Seven basic principles should be paid attention to the PLC controller programming newmaker welcome to e hall exhibition hall 3 PLC PLC programmable controller, PLC controller programming cable. 。 。 PLC programming should be paid attention to the following basic principles. （ 1) External input/output relay, internal relay, soft components such as timers, counters, reusable, there is no need to deliberately complex program structure is used to reduce the use of the contact number. （ 2) Ladder diagram each row from the left bus bar, coil in most the right side. In relay control principle diagram, the relay contacts can be on the right side of the coil, but contact is not allowed to in the ladder diagram on the right side of the coil. As shown in figure 1. （ 3) Coil cannot be directly connected to the left bus bar, that is to say, the coil output must have a condition as a logical result. May, when necessary, use an internal relay dynamic fault contact or internal special relay to achieve. See figure 2. （ 4) The same number of coil used in a program called two or more times a double coil output. Double coil output is easy to cause wrong operation, the previous output is invalid at this moment, only the final output is valid. But the coil output corresponding to the action of contact before, according to the logic operations to determine the output of the state. As shown in figure 3, due to the M1 double coil output, therefore, M1 output change with the last output M1, Y1 change with the first coil of M1, and Y2 change with second M1 output. So, usually, should as far as possible to avoid double coil output. （ 5) Ladder diagram program must comply with the principle of sequential, from left to right, from top to bottom, such as is not in conformity with the sequential circuit can not directly programming, such as shown in figure 4 circuit cannot be directly programming. （ 6) Ladder diagram, there is no limit to the number of contact in series, in parallel, can be unlimited use, as shown in figure 5. （ 7) Two or more than two coil can parallel output, as shown in figure 6.
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