P0926GH Central Processing Unit

The programmable controller of P0926GH is called Programmable Logic Controller (PLC), which is mainly used to realize logic control instead of relays. With the development of technology, the use of micro-computer industrial control device has greatly exceeded the scope of logic control, so today this device is called programmable controller, referred to as PC. but in order to avoid confusion with the personal computer (Personal Computer) abbreviation, so the programmable controller referred to as PLC, plc since 1966, the U.S. Data Equipment Company (DEC) developed since 1966, the current United States, Japan, Germany’s programmable controller quality, powerful.

P0926GH is essentially a computer dedicated to industrial control, its hardware structure is basically the same as the microcomputer P0926GH power supply plays a very important role in the entire system. If there is no a good, reliable power supply system is unable to work properly, so PLC manufacturers also attach great importance to the design and manufacture of power supply. General AC voltage fluctuations in the range of +10% (+15%), you can not take other measures and the PLC is directly connected to the AC power grid to go!

The central processing unit (CPU) of the P0926GH is the control center of the PLC. It receives and stores user programs and data keyed in from the programmer in accordance with the functions assigned to it by the PLC system program; checks the status of the power supply, memory, I/O, and alert timer, and can diagnose syntax errors in user programs. When the PLC is put into operation, it firstly receives the status and data of each input device in the field in a scanning way and stores them into the I/O image area respectively, and then reads the user program one by one from the user program memory, and then sends the results of the logical or arithmetic operations performed according to the provisions of the instruction to the I/O image area or the data register after the command is interpreted.