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.
The part of the PLC system
The PLC scale which completes which establishes the control duty needs mainly to be decided to the control system to inputs, {the birds and beasts leave the demand quantity and the controlled process difficulty degree.
(1) I/O estimate:
The system entrance point includes: The entrance hall summons the button 6 entrance points; In instruction button 4 spots; Floor inductor 4 spots; The gate area induces l; Manual opens gate l: Total entrance point 16 o'clock. But outputs the spot to include: Quick slow contact device 2 o'clock; about good contact device 2 o'clock; Floor indicating lamp 4 o'clock; Door lock 1 spot; Total outputs selects 9 o'clock. An amount to I/O points is 16/9;
(2) Programmable controller S7 - 200 CPU226 input, the output points are 24/16. Sufficiently answers the purpose.
3 Elevator’s PLC control system design
Because of the length of the article is limited. Only the elevator instructed and about the traveling schedule foreword lists the explanation.
3.1 The design of floors’ display
When the elevator moves to some level the instruction sends out. Instruct the position and the instruction.
3.2 The design of elevator’s decline
Take the elevator in three under good situations as the example. When the elevator one or two have the instruction, three under good positions 1, simultaneously the unsurpassed line actuates under the elevator the line.
3.3 The design of elevator’s raise
The elevator’s raise is the same as its decline
3.4 elevators arrive when programming
The elevator arrives some strata time. Has completed command signal replacement.
4 The display design of simulating elevator’s PLC control system with configuration software
MCGS condition software has the entire Chinese, face the window visible operation contact surface. Timeliness is strong, has the good parallel processing performance and the rich vivid multimedia picture. The MCGS condition software open style structure has the widespread data gain and the formidable data processing function. At the same time, provides the good safety mechanism, for many different ranks user hypothesis different operation jurisdiction. MCGS configuration software support many kinds of hardware equipment, realization "equipment irrelevant", the user does not need because of the external instrumentation partial modification, but affects the overall system. MCGS configuration software and "the MCGS movement environment" two systems are composed by "the MCGS configuration environment". Two parts are mutually independent. Also closely is connected.
This article uses the MCGS configuration software design. It chooses the suitable string mouth communication equipment in the equipment configuration window to increase Siemens S7 - 200PLC. Correctly establishes its attribute. In correct establishment configuration software the data variable equipment channel connection, then realizes PLC and the configuration software communication. Unifies the PLC in string mouth driver and the configuration software demand response, enable the computer the signal which sends out to PLC to have the response. In the MCGS configuration software user window, manufactures an animation contact surface. Establishes on the contact surface controls an attribute one by one, causes the establishment to control according to the real situation movement, the examination and the test elevator PLC control system to the elevator running status control effect. The MCGS user controls the window, the equipment window and the user window constitutes an application system the man-machine interactive graphical interface to compose configuration and configure object or the construction of each kind of different type or the function. It may dispose visibly to the real-time data.
5 Conclusions
In allusion to this control system which is an elevator of four floors. This article uses the S7 - 200 programmable logical co |
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