2711-K10G8L1 AB
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Estimation of memory capacity
The memory capacity is the size of the hardware storage unit that can be provided by the programmable controller itself, and the program capacity is the size of the storage unit used by the user application project in the memory, so the program capacity is less than the memory capacity. In the design phase, because the user application has not yet been written, the program capacity is unknown in the design phase and needs to be known after the program debugging. In order to have a certain estimation of program capacity during the design and selection, the estimation of memory capacity is usually used instead.
There is no fixed formula for the estimation of memory memory capacity, and different formulas are given in many literatures, which are generally 10 to 15 times the number of digital I/O points, plus 100 times the analog I/O points, and this number is the total number of words in memory (16 bits for a word), and then consider the margin according to 25% of this number.
Third, the choice of control function
The selection includes the selection of arithmetic function, control function, communication function, programming function, diagnostic function and processing speed.
(1) Computing function
The operation function of simple PLC includes logic operation, timing and counting function; The arithmetic function of ordinary PLC also includes the arithmetic function such as data shift and comparison. More complex operation functions include algebraic operation, data transfer, etc. Large PLC also has analog PID operation and other operation functions. With the emergence of open systems, the PLC has communication functions, some products have communication with the next machine, some products have communication with the same machine or host computer, some products also have data communication with the factory or enterprise network. Design and selection should be based on the requirements of practical applications, reasonable selection of the required computing functions. Most applications only need logical operations and timing and counting functions, some applications need data transfer and comparison, when used for analog and control, only use algebraic operations, numerical conversion and PID operations. Operations such as decoding and encoding are required to display the data.
(2) Control function
The control function includes PID control operation, feedforward compensation control operation, ratio control operation, etc., which should be determined according to the control requirements. PLC is mainly used for sequential logic control, therefore, most occasions often use a single loop or multi-loop controller to solve the analog control, and sometimes also use a dedicated intelligent input and output unit to complete the required control functions, improve the processing speed of PLC and save memory capacity. For example, PID control unit, high-speed counter, analog unit with speed compensation, ASC code conversion unit, etc.
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GRACO 595 ULTRA MAX II ELECTRIC AIRLESS SPRAYER
