SPQRS22 Controller with Expanded Memory ABB

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Essential details：SPQRS22 Controller with Expanded Memory ABB

The Programmable Logic Controller (PLC) is a digital electronic device with a microprocessor. It is a digital logic controller used for automatic control and can load control instructions into memory for storage and execution at any time. Programmable controller consists of internal CPU, instruction and data memory, input and output unit, power module, digital analog unit modular combination.
Widely used in the field of industrial control. Prior to the advent of programmable logic controllers, it was common to use hundreds of relays and counters to form an automated system with the same function. Now, simple programmable logic controller modules have basically replaced these large devices. The system program of the programmable logic controller has been initialized before leaving the factory. Users can edit the corresponding user program according to their own needs to meet different requirements of automatic production.
The original programmable logic controller only had the function of circuit logic control, so it was named programmable logic controller. Later, with the continuous development, these computer modules with simple functions have been equipped with many functions, including logic control, timing control, analog control, multi-machine communication and so on. The name was also changed to Programmable Controller, but because it was also short for PC and Personal Computer, and because of years of habitual use, the term was often used. The abbreviation PLC is still used in the term.

SPNIS21

PLC essence is a kind of computer dedicated to industrial control, its hardware structure is basically the same as the microcomputer, the basic composition is:
A. Power supply
PLC power supply plays a very important role in the whole system. If there is no a good, reliable power system is unable to work normally, so PLC manufacturers on the design and manufacturing of the power supply is also very important. General AC voltage fluctuation in +10%(+15%) range, can not take other measures and PLC directly connected to the AC power grid
b. Central Processing Unit (CPU)
The central processing unit (CPU) is the control center of PLC. It receives and stores the user program and data entered from the programmer according to the function given by the PLC system program; Check the status of power supply, memory, I/O, and alert timer, and diagnose syntax errors in user programs. When PLC is put into operation, first of all, it receives the status and data of each input device in the field in the way of scanning, and respectively stored in the I/O image area, and then reads the user program one by one from the user program memory, after command interpretation according to the instructions of the implementation of logic or arithmetic operation results into the I/O image area or data register. After all the user programs are executed, the data in the output state or output register in the I/O image area is transmitted to the corresponding output device, and so the cycle runs until it stops running.
In order to further improve the reliability of PLC, in recent years, the large PLC also adopts double CPU redundancy system, or adopts three CPU voting system. In this way, even if one CPU fails, the entire system can still run normally.
c. Storage
The memory that stores system software is called system program memory.
The memory that holds application software is called user program memory.
d, input/output interface circuit
1, the field input interface circuit consists of optical coupling circuit and microcomputer input interface circuit, the role of PLC and field control interface interface input channel.
2, the field output interface circuit by the output data register, electing circuit and interrupt request circuit integration, PLC through the field output interface circuit to the executive parts of the field output corresponding control signals.

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Superiority products SPQRS22 Controller with Expanded Memory ABB