Automation design and application of PLC control in the warehouse

Design and application of the PLC controller control of automatic warehouse newmaker welcome to e exhibition hall 6 storage/sorting equipment exhibition shelves, cantilevered shelves, fluent type shelf, beam type shelves, light shelves,. 。 。 1 introduction in the field of the warehouse, goods transportation, storage, management, and control the size of the bigger and bigger, by artificial implementation has been far can not need. Automated warehouse technology have drawn the attention of the people in the material storage industry, its focus to the material control and management requirements of real-time control, coordination and integration, computer, data between patch, mechanical equipment controller and communication between host computer and they can timely summary, warehouse computer record orders in a timely manner and the delivery time, according to inventory, supply planners can easily make a decision, managers master the supply and demand at any time. The application of information technology has become an important pillar of the warehouse technology. Satisfied people speed, accuracy, such as height, weight, repeated access and handling requirements, make overall benefits strain capacity and production more than independent benefit is the sum of the parts, automatic control technology has gradually become the core of warehouse automation control technology. Is an important part of the goods storage warehouse, it is in the case of direct no manual processing system can automatically store and take out the items. In the process of warehouse stock, using industrial carrier will items in the warehouse. Goods store in the modern large-scale warehouse task is very heavy, to realize the automatic operation, can save money, and reduced the waste, therefore to establish a convenient and reliable automatic distribution system is very urgent and necessary. This example USES the PLC to realize automatic control, solve the labor intensity, poor economic benefit issues. Action 2 process requirements of the eight industrial carrier in the storage, control of the carrier has the following requirements: ( 1) At the start of the work, the car parked in a warehouse at this time. When there is no car call ( Both call car) Said, each indicator of the warehouse, the warehouse can call; （ 2) If a warehouse in case of call car, according to our warehouse car button, the other position indicator lights are out, say again call car is invalid; （ 3) In the car parking Spaces called fixed; When parking number greater than the parking number, the car with automatic high; When less than a parking space, parking space on the car with automatic low, when the car arrived at call parking automatic parking; （ 4) Car arrived at call parking requirements for 30 s for the use of the warehouse, should not be other warehouse immediately shout; （ 5) Temporary reply message again after the blackout, the car won't start on its own. 3 3 programming. 1 I/o distribution and PLC models each warehouse have set a limit switch st and a roller type car keys button sb, st can be automatic reset; System has used for starting and stopping buttons, these are all PLC input element. Car with an electric motor drive, motor forward when the car toward high, small reversal to low, the motor forward and inversion of each need a contactor, executive components is the output of PLC. In addition the warehouse and light as a car show. The motor and the indicator light is PLC control object. The limit switch of automated warehouse and layout of the car call button as shown in figure 1, figure 1 st and sb number is also the warehouse number. Due to the warehouse for car lamp state is consistent, in order to minimize the take up the number of input and output points of PLC using small current light emitting components connected in parallel, then in a PLC output point. The control part of the system of Siemens ( seimens） S7200 PLC, industrial truck control system I/o allocation table see table: 3. 2 ladder diagram programming in order to convenient to analyze problems, to make the system action process flow diagram, then according to the technological requirements of the industrial truck, design the corresponding control program ladder diagram, flow diagram and ladder diagram as shown in figure 2, figure 3, respectively. In the program, use the transfer instructions and comparison, the first car in the warehouse, transfer to a memory location, and then transmit the call car warehouse number to another memory cell, and then compare the contents of the two memory unit. If call car parking a number greater than a number of the car to the high; If the call car parking a number less than a number of the car to run low. This kind of control in the car, is the backbone of the program design. 3. Other requirements (3 program control 1) If there is a warehouse for car should be immediately sealed off other warehouse call car signal; （ 2) Driving car in place should stay in the warehouse after a period of time, the delay time blockade lifted again to call car signal; （ 3) Loss of pressure protection; （ 4) Car display program. 4 conclusion because of the automatic control system USES PLC as the core, improve the control flexibility and generality, to adapt to the change of the various technological requirements, further to develop in the direction of intelligent automation warehouse technology.
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