【正文】 ocity modulation partial selects the high performance the vector control frequency changer, matches (encoder) surveys the mouse cage type electric motor by the pulse generator the rotational speed, thus constitutes the electrical machinery the closed loop vector control system, the realization mouse cage type electric motor exchange frequency conversion velocity modulation (Variable Voltage Variable Frequency, is called VVVF) to move.Chart 1 PLC double elevator coordinated control system hardware diagramPLC first receives shouts the ladder signal, the even level signal from the elevator, then acts according to these input signals the condition, through its interior a series of plex control procedure, has the foreword to each kind of signal logical relations to carry on processing, finally controls the electrical machinery, the frequency changer and each kind of monitor to the direct current gate at the right moment sends out the switch quantity control signal, to two elevators implementations group control. In elevator control system, because the elevator control belongs to the random control, between each kind of input signal, output signal as well as input signal and output signal connection very strong, the logical relations processes is extremely plex, this gives PLC the programming to bring the very great difficulty. In a sense, PLC programming level height on decision overall system movement quality .Therefore, the PLC application bees the control elevator movement in the elevator control programming technology the essential technology, at the same time this also is a this system design key point.Sends out the switch quantity control signal while PLC to the frequency changer, in order to satisfy the elevator the request, the frequency changer needs through with the mouse cage type electric motor plumbing pulse generator and the PG card, pletes the speed examination and the feedback to the electric motor, forms the closedloop system. The pulse generator outputs A, the B two pulses, the PG card receives after the pulse signal, again this feedback for frequency changer in, in order to carries on the operation adjustment. According to A, the B pulse the foreword, may judge the electric motor the rotation direction, and may according to A, the B pulse frequency obtain the electric motor the rotational speed. Because this design selects is the general frequency changer, therefore its parameter establishment and the outside plant design the plex degree must be higher than the elevator specialpurpose frequency changer by far, its establishment quality also directly will affect the elevator movement actual effect. PLC model choice and I/O points assignmentThe elevator logic control system control core is PLC, which signals need to input to PLC, PLC need to actuate which loads, as well as uses how to program the way, all is the question which needs earnestly to consider, can affect its internal I/O points assignment. Therefore, the I/O points determination, is a question which the design entire PLC elevator control system first needs to solve, is deciding the system hardware partial designs, also is the premise which the system software piles.This system is 5 buildings designs, according to the PLC I/O pitch point use principle, should keep certain I/O to make time the expansion uses. In the system actual need entrance point 47, the output select 40, therefore we select Simens S7300PLC, CPU model elects is CPU315, the load module model elects is DI32xDC24V, altogether needs two, the output module model elects is DO32xDC24V/, altogether also needs two. I/O address distribution list like table 1 shows.Table1 I/O address distribution listSymbolAddressSymbolAddress1 upstairs hallcall buttonI 1 upstairs hallway light callQ 2 upstairs hall call buttonI 2 upstairs hallway lights callQ 2 ownstairs hall call buttonI 2 downstairs hallway lights callQ 3 upstairs hall call buttonI 3 upstairs hallway lights callQ 3 ownstairs hall call buttonI 3 downstairs hallway lights callQ 4 upstairs hall call buttonI 4 upstairs hallway lights callQ 4 ownstairs hall call buttonI 4 foyer downstairs lights callQ 5 ownstairs hall call buttonI 5 call lights downstairs hallQ 1 Call button 1 buildingI 1 1 building called lightQ 12 building call buttonI 1 2 building called lightQ 1 Call button 3 buildingI 1 3 building called lightQ 14 building call buttonI 1 4 building called lightQ 15 building call buttonI 1 5 building called lightQ 11 Floor sensorsI 1 BCD Code LowQ 12 Floor sensorsI 1 BCD code medianQ 13 Floor sensorsI 1 BCD code highQ 14 Floor sensorsI 1 uplink indicatorQ 15 Floor sensorsI 1 Downlink indicatorQ 1on the floor sensorsI 1 up outputQ 1onlayer under the sensorI 1 downlink outputQ 1to open the door buttonI 1 open outputQ 1close buttonI 1 close outputQ 1to open the door in placeI 1 highspeed operationQ 1closed in placeI 1 lowspeed operationQ 1infrared sensorsI 2 1 building called lightQ 1upstream limitI 2 2 building called lightQ 1downlink limitI 2 3 building called lightQ Elevator use switchI 2 4 building called lightQ 2 1 building call buttonI 2 5 building called lightQ 2 2 building call buttonI 2 BCD Code LowQ 2 3 building call buttonI 2 BCD code medianQ 2 4 building call buttonI 2 BCD code highQ 2 5 building call buttonI 2 uplink indicatorQ 2 1 Floor sensorsI 2 Downlink indicatorQ 2 2 Floor sensorsI 2 uplink outputQ 2 3 Floor sensorsI 2 downlink outputQ 2 4 Floor sensorsI 2 open outputQ 2 5 Floor sensorsI 2 close outputQ 2 on the floor sensorsI 2 highspeed operationQ 2the next level sensor layerI 2 lowsp