1. Overview
recent years, with improvement of living standards, and vehicle prices dropped lower and lower, there are car people seem to have become more and more commonplace. However, if you live in some older communities, you will find easy to buy a car, parking can be difficult; Even worse, some people go to work in the city center in order to find a parking space, had to play more than catch the bus was still early. Why, this historical reason, people did not think people would be so quick to have their own family cars, as well as Chinese too fast urbanization, the urban poor in this respect of the infrastructure stretched, so the state can not afford the city unlimited degree of foreign expansion, also not allowed to leave in each large open space outside the building as a parking lot.
order to solve the city with limited land area and a growing number of construction sites and the demand for parking spaces, most recently the Ministry of Construction in the effective use of underground space resources and space resources on the ground put the new policy, that is, request a new house or office, must be equipped with a certain number of parking spaces, whether underground or on the ground. In this way, parking on the first ever greeted the spring the last three years, has been speeding development.
2. parking Introduction and Twido PLC program
parking garage, from its appearance and function can be divided into the following categories: lifting and class, vertical lifting type, simple movements, plain and mobile classes, vertical circulation type, laneway class level circulation class, multi-cycle class, etc.
(Lifting and Transferring classes garage)
present application is lifting and more classes, because technology is relatively simple. One of the most simple systems are usually composed of six parking spaces composed of two storeys, five cars stopped only six parking spaces, leaving a vacancy as a traverse gap. As shown below:
The first of six locations that we can traverse it as a gap, of course, also be 4,5.
way, stop and get the vehicles in the actual logic is about: When you want to park two parking spaces to 4,5, the most simple, direct to drive to the top on it As for opening up or down is up, it depends on your personal preferences and driving skills of the. If you want to park at the 3 parking spaces, are relatively simple, just 3 spaces down, to drive up and then rose to the top on it. If you want to the 2nd place car, we should use 6-bit, and first shift will be 5 to 6 slots, and then 2-bit down, pulled up, and then rose to the top. As to the 1st place to stop, think you own it, the logic is simple, at least compared with "Huarong" Cao Cao save much simpler.
above is that all the basic working principle of parking, no matter what kind of structure, in addition to the movements of vehicles in the form and manner is different, its the similar manner in its work.
in such a system, do not look simple, but if you want a pile of steel and the motor according to the will of people to run, the program is still a little complicated. First of all Members of interlocking spaces, followed by the vehicle s security measures, which have adopted the implementation of PLC program logic. Typically, one of the most simple system uses about 6 parking spaces 40DI / O, of course, with the buttons, lights, some of it will use advanced text display or touch screen, while a lot of proximity switches, limit switches, Photoelectric switches and contactors is indispensable. Twido PLC configuration roughly as follows:
TWDLCAA24DRF TWDDDI8DT TWDDRA8RT
3. product technology updates
recently, more and more parking system, lifting and using a multi-layer structure, and its increasingly high degree of automation, unmanned vehicles and the IC card has the more applications and Vehicle Systems and more generally.
so that the procedural requirements of the PLC increasingly high, and input and output points on the PLC demanding more and more. Typically, three layers, each layer has between 30-40 parking spaces, to use the PLC switch capacity is about: 200DI, 100DO. This, Twido PLC single CPU can not meet the system requirements. To solve this problem, I advise clients to use Twido PLC remote I. / O means to facilitate the solution of this problem, its configuration is as follows: 2 * TWDLMDA20DRT 6 * TWDDDI32DK 7 * TWDDRA16RT
course, Twido PLC CANopen the main module and Advantys OTB distributed I / O after release, we can use the new configuration:
as CANopen communication speed can reach 1Mbps, so it can easily solve many Twido CPU speed serial communication between the lack of problems, and a CANopen master module can be linked to 10 a few from the station, then such a configuration, the maximum amount of input and output can be more than 1000 points, which parking system has been fully able to meet all requirements.
In addition, if the client requests access to vehicles with smart IC card system, in order to simplify the process, can effectively use Twido PLC of the lookup function, which will solve the complex license number and the corresponding number of parking spaces very helpful; In addition, the communication capacity of the PLC have higher requirements. At this stage, most of the IC development of intelligent systems use single chip, using ASCII protocol to communicate with the PLC, in order to respond to the PLC real-time data sets IC reader, usually, we need to set from the PLC station This ASCII programming have a certain degree of difficulty, see Twido application skills-ASCII slave mode programming.
However, if the customer s card reader system can upgrade to the PC, and can support Ethernet, then the above problem will cease to exist, we can Twido built-in Ethernet ; net CPU or Twido PORT, the PLC and the reader free fast together, this technology is now in development.
4. Summary
Twido PLC to parking in the use of the following main advantages:
1) 10-264 point I / O, most of the parking system to meet the requirements;
2) Twido PLC supports a variety of communication, user-friendly system upgrade;
3) a variety of expansion modules, can be flexible according to the system configuration requirements.
the customers Twido PLC has been three years old, in Beijing and other places there are thousands of parking spaces, the whole stable. If you add Twido Ethernet CDMA / GPRS wireless communication utilized to establish their own centralized remote monitoring system, you can stay at home, away from the scene to know all the operation, which will greatly reduce the parking on-site large maintenance work, the liberation of more technical staff into the new project to go.