PLC and elevator control

One, the introduction of elevator in the national economy and has been widely used in the life. In order to adapt to the rapid development of the elevator, we developed two sets of simulated elevator system. Because of the programmable controller ( PLC） Have taken from the easy-to-learn programming software ladder diagram language, convenient control, strong anti-interference ability, stable and reliable running etc, now of the elevator control using programmable controller to achieve more. Elevator is actually based on external call signal and its control law, and the call is random, the elevator is in fact a man-machine interactive control system, use the order into system or logical control can't meet the control requirements, therefore, the control system adopts random logic way. 2, 1 elevator control system is introduced, the elevator control requirements of the system simulation by the five layers of elevator simulation device, frequency converter and the elevator control system, etc, which simulate the elevator 3 m high, each layer is 0. 5m。 Due to the operation of the elevator is according to the floor and capsules call, trip signal to control signal, while the floor and capsules call is random, as a result, the random logic control system control should be adopted. Namely in the sequence logic control to realize the elevator, on the basis of the basic control requirements, according to the random input signals, and the corresponding state of the elevator timely control the operation of the elevator. In addition, ( 1) The location of the capsules was determined by pulse encoder pulse number, and send counter of PLC to control. At the same time, set up a proximity switch on each floor and flat floor. （ 2) For convenience of observation, the direction of the elevator and the elevator's floor for display, we adopt and glowing tube LED display, and on the floor and capsules call signal indicator light display ( A light on the switch) 。 （ 3) In order to improve the efficiency of the elevator and leveling the accuracy of the system requirements of PLC can add, deceleration and braking of capsules for effective control. According to the actual location of the capsules and ac speed regulation system control algorithm to achieve. (4) to the safety operation of the elevator, the system should be set and reliable fault protection and the corresponding display. 2, PLC controller hardware configuration and system considering the following aspects, we choose the FLN PLC. （ l） FX2N flexible configuration, in addition to the host unit, also can be extended I / 0 module, A/D module, D/A module and other special function module. This system design to the I / 0 52 points ( 28 points, input output 24 points) 。 Host USES FX2N - miniaturization of basic unit 64MR。 （ 2) FX2N instruction function is rich, have all kinds of mandatory article 107, and the instruction execution speed. （ 3) FX2N PLC internal auxiliary relay M are available, and the skin state relay S, T, timer register D, the function of counter C and quantity meet the needs of the system control requirements, especially the high-speed counter ( C235, etc. ) Can accept pulse encoder pulse. （ 4) The volume is smaller than FX2 PLC controller of FX2N PLC controller by more than 50%, but the control function and performance are the same. （ 5) FX2N PLC programming, the programmer are available, and can also be used in PC mitsubishi company dedicated programming package MELSE MEDOC. Programming languages can use ladder diagram or instruction sheet. Especially the available PC to monitor system in real time. Provides great convenience for debugging and maintenance. The hardware configuration of the control system is shown in figure l. Three, software design and characteristics of 1, the software design of this system software design method, as shown in figure 2 of the program flow chart for programming. 2, software design characteristics ( 1) Using the priority queue. , according to the location of the elevator and direction in the programming, the four priority queue, namely the uplink priority queue, ascending time priority queue, descending priority queue priority queue, down time. Among them, the priority queue for elevator upward run, in the elevator the location above floor signal run up calls, the call signal corresponding to the floor with the pulse number of storage register display: time priority queue for elevator upward run, in the elevator the location upward run call signal emitted from the floor, the call signal corresponding to the floor of the pulse number of storage register queue. In the elevator control system in the operation of the real-time display arrangement of four priority, provides a basis for the realization of the random logic control. （ 2) Using fifo queue. According to the elevator running direction, the direction of the priority queue nonzero unit ( Have a call soul-rending nature unit of the unit, no call when the unit is zero) To register queue ( FIFO queue FIFO) , we use FIFO read instructions SFRDP, compare the first unit of the FIFO data into the register. （ 3) Using random logic control. When the elevator to a running direction is close to a certain floor of deceleration, judging whether the floor has a similar call signs (directly Uplink call sign register for downlink call sign the register, a call request, the corresponding register for l, or 0) , if any, the corresponding number of pulses and compare registers are compared, such as the same, is on the floor and stop, if not the same, then the comparing data into registers, and compare the original register data save, carry out the floor and stop. After the completion of the activity, and the data will be saved back into the register, in order to realize random logic control.
Shenzhen Coolmay Technology Co., Ltd. is specialized in sourcing programmable control systems plc manufacturers through its unparalleled worldwide network of supply. Go to Coolmay PLC, you will surely find your ideal at the most favorable price.
For details on plc manufacturers, see Shenzhen Coolmay Technology Co., Ltd. at Coolmay PLC.
plc manufacturers receives the updates through industry associations, internal legal counsel, regional associations and legal publications.
Diversifying is an excellent growth strategy, as it allows Coolmay to have multiple streams of income that can often fill seasonal voids and, of course, increase sales and profit margins.
If something seems too good to be true, then it can be a , which provides plc controller price value over its cost.