【正文】 wer input divided into types below: sharing power (220VAC or 110VAC), direct current power supply (monly used to 24VAC) 3 Programmable Controller Achieving Control Points Transformation of information I/O can be achieved by physical, which is could be considered to be two basic points. Information on their operations into and out of storage exists in the procedures of PLC. PLC procedures established manufacturers of the system procedures (irrevocable), and users develop their own applications (users) procedures. Operating system platforms provide procedures, and procedures for the PLC signal and reliable operation of the public with the information necessary conversion. Users control procedures designed by the users. What kind of control, due to what the user procedures. Reliable physical realization mainly relies on anyone else (input) and (output) circuit. PLC’s I/O circuits are specially designed. Of a filter circuit to input signal to eliminate highfrequency interference. But with the internal puter circuits, electricity is isolated and it also relies on photocoupling working ponents. Guangou ponents export relays working exports from electricity within and outside the circuit, or. A power output circuit also enlarged to be sufficient to general industrial control ponents, such as electromagic valves, contact devices, and so on. For example: I/O circuits contains a lot of sorts, each entry points or export points to a circuit I or O. PLC with how I/O point, the general will use a number of I/O circuit. But because the highly integrated circuit provided them, so size is not large share. Constantly monitored the importation of circuit status and pending in the importation of Shortterm storing equipment. Each entry point has a corresponding memory of their information Shortterm storing equipment Export circuit to export fliplatch devices messaging to export points. Export fliplatch and the output is also gathers Import and export of fliplatch and Shortterm storing equipment here are the actual device of PLC processors I/O the register. They exchange information through puters and puter memory bus, and primarily by the realization of operating system procedures. Shortterm storing equipment is to lose people read the information within the PLC, it is said that the importation of regeneration. PLC is within the open storage of specialized information shine upon area. Each of the district counterpart spaces (bit) as input relays, or those soft contacts. These positions into one that includes links, home to multiple broken into 0. Because it is the state of renewable received, so that it is reflected in the imported state. Export fliplatch and the PLC memory areas are exported shine upon counterpart. 1export fliplatch have a hard place (bit) with its counterpart, the place known as export relays, or that exporting coil. By operating system procedures, and the output relays shine upon the state to export fliplatch. Also known as the shine upon exporting renewable. Is the main operating system on renewable export procedures achieved? Thus, users only need to be procedures that exist in the area of shine upon export shine upon their zone, especially in the importation of the time series is converted into the output time series. This is a logic and data processing. The PLC is a powerful mand system, the procedures to prepare to meet this requirement is entirely possible, but also relatively easy. 4 Programmable Controller Achieve Control Of The Process Briefly, PLC controlling process is usually achieved: Of renewable to users operating procedures to export renewable further importation of renewable to users operating procedures to export renewable: never stop to the cycle of repeated carried out. With the abovementioned process, the realization of a PLC control is clearly possible. Because: With the importation of renewable, can be imported by the import control circuit input shine upon information deposited PLC District。s third characteristic, will be further introduced Second, even if the PLC failure, the maintenance is very convenient. This is because the PLC had many failures presentation signals, such as PLC maintain support within the cell voltage insufficient data, the corresponding signals are low voltage directives. Moreover, the PLC itself is also a record of failure. Therefore, PLC, a failure, it is very easy diagnosis. At the same time, it is also diagnosed rear failure is simple. Pai it may module, the module can buy spare parts market, the replacement would be simple. As for software debugging good will not malfunctioning, so long as no adjustments based on the use of experience to perfect indulges. (5) To facilitate: PLC for certain equipment, if the equipment is no longer used, it could be used in the PLC to use other equipment, as long as this adaptation process is fulfilled. If the original equipment with new equipment is from the larger one, the number of modules therefore can be trusted. Reliable Work PLC control system used to achieve it is very reliable. This is because the PLC hardware and software in two aspects have taken many measures to ensure that it reliable. In fact, if PLC unreliable work cannot be used in industrial environments, will not make itself PLC In terms of hardware: PLC input and output circuit internal CPU is electricity segregation. photocoupling information is on the device or the transmission of electromagic devices. Moreover, the CPU board is resisting electromagic interference shielding measures. It will ensure that PLC operating procedures and magic interference from the outside world too normal. PLC use ponents for many of the noncontact, but also for the highly integrated, the number is not too large, but also provide a materi