220v-250w电热管nd output components and its instruction. STL, RET belongs to step by step instructions are among those two, these instructions are generally in the “rev. Stop the programming method of” basic didn’t appear, students don’t know the actual. If the method of single lectures, not soon be able to master. Then design a set of circuit, equipped with a mitsubishi programmable controller and handheld programmer and associated button, contactor (intuitive), on-scene practice for students to cooperate.
1, setting instructions SET and reset RST220v-250w电热管
By students begin, use the commands in figure 1 a handheld input PLC programmer, run the observed. Pointed out that the line does not SET out instruction, when the external signal closes the X0, setting instruction SET driver output Y0 closed relay coil, thus promote the external contact closure. When X0 disconnect, contactor is still in the on state. Directives SET the self-hold function, keep its on state. When to stop, external signal closes the X1, the RST reset instructions make the output Y0 coil disconnection, contactor by a connected state changes to disconnect immediately, and no longer sucked together. Visible RST has to reset the coil disconnection of functions, and maintain a disconnected state.
2, M8002 instruction
Early M8002 for pulse relay, its dynamic contact in PLC scan a period when the power is closed. Figure 2 is using M8002 instead of starting with the input of the normally open contacts. Students will enter the instructions of the diagram of PLC, the PLC into running state, the external contact immediately closed, students perceive it didn’t immediately after start the link, it’s the moments on electricity automatically closed. When the external signal closes the X0, reposition instruction RST Y0 coil power, so that the outside of the contactor disconnect immediately, and no longer sucked together. If 220v-250w电热管