220v-750w电热管 220v-750w加热管 220v-750w发热管
220v-750w发热管processing, switching between KM1 KM2. And figure 4 is transferred to S20 step after 3 s, Y0 load KM1 keeps off, and because of the STL S20, through to pick up the load of Y1 was driven, external contactor KM2 and off immediately, essence is two contactor (or Y0, Y1 output coil) has been closed and is maintained and at the same time. Should be emphasized 220v-750w发热管in figure 4 is different from figure 3, mainly Y0 is setting methods, should pay special attention to. It is also need to consider when parking problem.
2, ZRST instruction, free parking, circulation and other operation
ZRST reset instruction for area, but the state of the components under the setting of regional reset.
Figure 5 is a complete stepping sequence control ladder diagram, the instruction input PLC and observed. And then to explain.
Its working process is: when in the running state of PLC, M8002 moment produces a pulse, activate S0 state component, by the way the S20 back – S21 state element to reset. STL S0 normally open contacts are connected at the same time, if X1 no signal, the PLC is in the standby state. X1 is known as the origin condition here, as long as meet the conditions of the origin (i.e. the start button of external or 220v-750w发热管