PLC ladder program should be prepared in the following programming skills to master.
1) more contacts in series at the top of the ladder circuit series
2) number of parallel contact circuit should be placed to the left, as shown in Figure 4-26. Figure 4-26 b) ratio of a) eliminating the 0RS and ANS instruction. Once there are several parallel circuit in series, parallel circuit should contact the most on the left.
3) handling of complex circuits
Ladder 4-22 (1) Programming diagram of the bridge circuit is a bridge circuit, it can not be directly programmed must redraw the circuit shown in Figure 4-27 is available for programming.
(2) If the ladder circuit structure composed of more complex, with ANS, 0RS instructions such as difficult to solve, can be reused a number of contacts to draw its equivalent circuit, and then the programming is relatively easy. If you use the programming software can also be programmed directly.
PLC ONE 