What are the performance index of PLC programmable controller main performance index

Storage capacity of storage capacity refers to the user program memory capacity. The user program memory capacity is big, can be a complex program. In general, small PLC user memory capacity of thousands of words, and mainframe user memory capacity of tens of thousands of words. Input/output (I/O points I / O) Points is PLC can accept the sum of the input signal and output signal, is an important index to measure the performance of PLC. The more I/O points, external can meet the more input devices and output devices, the greater the scale control. Scanning speed scanning speed is refers to the speed of PLC execute user programs, is an important index to measure the performance of PLC. General with scan 1 K word user program to measure the time needed for scanning speed, usually in ms word for the unit/K. PLC user manual is generally given to execute commands every time, you can do the same by comparing all kinds of PLC used in time, to measure the speed of scanning speed. The strength of the instructions on the number of function and function, quantity is important index to measure the performance of PLC. Programming instructions the stronger, the more the number, the function of PLC processing ability and control ability is stronger, user's programming is more simple and convenient, the easier it is to complete the complex control tasks. Amount and type of internal components in the PLC program, need to use a lot of internal components to store a variable, the intermediate results, keep the data, timing, counting, module Settings and all kinds of information such as flags. Amount and type of these components, the more said PLC controller's ability to store and handle all kinds of information. Special function unit what kinds of special functional unit and function of the strength is an important index measure of PLC products. Extensible PLC extensible ability including the expansion of the I/O points, storage capacity expansion, the expansion of the networking, the expansion of the various functional modules, etc. Often need to consider in choosing PLC controller, PLC extensible ability.
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