The configuration simulation design of elevator’s PLC control system
1 Foreword
The electrical system of elevator is composed with two parts that are the drives system and the control system. The traditional electricity control system uses the relay logic control which is being gradually eliminated because of its shortcoming as too many electronic contacts, the high failure rate, the badly reliability, the big volume and so on. At present the design of elevator uses the programmable logical controller (PLC), which requests the change of function nimbly; program simply, few breakdowns, low noise. Servicing and maintenance are convenient, energy conservation laborsaving, the ability of resisting molestation is strong, and the control box’s area is few. When a passenger enters the elevator, presses down the button of the floor, after the door of elevator shut-off automatically, the control system carries out the following operation: according to the position that the theater box locates and the layer the passenger locates to judge the moving direction of the theater box, so as to guarantee the theater box decelerates when it get the floor. Let the theater box stops on the floor which is selected; at the same time, according to the call of the floor to stop by the way, open and close the door automatically. In addition, it must have the signal lights inside and outside of the theater box which shows the moving direction and the layer which elevator get.
MCGS (Monitor and Control Generated System，general supervisory system) is as soon as applies mechanically to the fast structure and production computer supervisory system configuration software, can move in the Windows platform. Through to disposal and gather the field data to offer some solution which are about actual project question with the display of animation, the process of alarm, the flow control, the real-time curve, the historical curve and the report form output and so on. Using the windows graph function complete, the contact surface uniformity is fully good the characteristic which, easy to learn and easy to use. Compared to former, it is more universal than use the industry control system which is developed by the special-purpose machine. It has more widespread application in the automated domain. This article uses MCGS the configuration software examination elevator PLC control system the movement situation. 2 Elevator’s PLC control system
The S7 - 200 programmable controllers are one kind of new programmable controller which the Germany siemens develops. It works reliably, function strong, storage capacity big, programming convenient, the out-port May the direct drive 2A relay or the contact device coil, the ant-jamming ability is strong. Therefore, it can satisfy the elevator to the electricity control system request. S7-200 series small PLC (Micro PLC) may apply to each kind of automated system. The structure is compactly. The inexpensive cost 12. B~ function formidable instruction collection enables S7 - 200 PLC to become each kind of small control duty ideal solution. - 200 programmable forewords controllers compile four elevators using Siemens the S7 the control systems. Separately completes in outside the instruction, the hall summons the instruction, the floor position instructed, the even level control; opens control duty and so on gate control.
STEP 7-Micro/WIN 32 is S7-200 series PLC programming software. May carry on the programming to the S7 - 200 all functions. This software moves in the Windows platform. Standard Windows software and so on elementary operation and omce is similar, simple, is easy to study. Its basic function is assists the user to complete the application software task. For example in the foundation user program, the revision and the edition process edit the appliance to have the simple grammar inspection function. It can also mount the work form of PLC, the parameter and the moving monitor with software immediately.
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