220v-700w电热管 220v-700w加热管 220v-700w发热管
220v-700w发热管he previous step, step after start. This circuit has ended. RET instruction should be set up at the end of the end of the circuit, entails deleting RET instruction. A deleted immediately appear “program syntax errors,” PLC executes instructions. Visible ends must have RET instruction, but don’t set up each step of the way.220v-700w电热管
Should be pointed OUT that at the same time, the ladder diagram of the STL S0 (or STL S20) in through to the state, can be regarded as the left bus bar moved to STL S0 (or STL S20) of the right side of the normally open contacts, formed a small temporary bus, so in touch with state components connected to the right side of the starting point, to use LD, LDI instruction, if the coil with OUT instructions directly. In particular, stressed that it should be to avoid in the subsequent programming error. Figure 3 only to want to restart the power shutdown and restart.
Second, in the process of programming is not easy to be understood (or ignore) the problem of parking and the relevant methods
1, the difference between the setting and did not place
The difference between the setting and did not place, often is the students learning difficulties, or easy to be ignored, wrong place. The difference between the figure 3 and figure 4 is: Y0 setting used in figure 4, while in figure 3 USES a coil processing, other are the same. Input instructions to PLC will find, in figure 3 Y0 and Y1 is the coil 220v-700w电热管