输入/输出（I/O）点数是PLC可以接受的输入信号和输出信号的总和，是衡量PLC性能的重要指标。I/O点数越多，外部可接的输入设备和输出设备就越多，控制规模就越大。
扫描速度是指PLC执行用户程序的速度，是衡量PLC性能的重要指标。一般以扫描1K字用户程序所需的时间来衡量扫描速度，通常以ms/K字为单位。PLC用户手册一般给出执行各条指令所用的时间，可以通过比较各种PLC执行相同的操作所用的时间，来衡量扫描速度的快慢。
指令功能的强弱、数量的多少也是衡量PLC性能的重要指标。编程指令的功能越强、数量越多，PLC的处理能力和控制能力也越强，用户编程也越简单和方便，越容易完成复杂的控制任务。
Product description
IS8500232/422 Reflective memory networks are widely used in real-time simulation systems, in which the various functional modules are clearly divided. In charge of
The computer that collects the data, the computer that solves the model, the computer that displays the image, and the computer that outputs the data
1. Storage capacity
Storage capacity refers to the capacity of user program memory. The capacity of the user program memory is large, and complex programs can be written. In general, the user memory capacity of a small PLC is several thousand words, while the user memory capacity of a mainframe is tens of thousands of words.
2. I/O points
Input/output (I/O) points are the sum of the input and output signals that PLC can accept, and are an important indicator to measure PLC performance. The more I/O points, the more externally accessible input and output devices, and the greater the scale of control.
3. Scanning speed
Scanning speed refers to the speed at which PLC executes user programs and is an important indicator to measure PLC performance. Scanning speed is generally measured in the time required to scan a 1K word user program, usually in ms/K words. The PLC user manual generally gives the time used to execute each instruction, and the scanning speed can be measured by comparing the time used by various PLCS to perform the same operation.
4. Function and number of instructions
The strength and quantity of the command function are also important indicators to measure the performance of PLC. The stronger the function of programming instructions, the more the number of PLC processing power and control ability is also stronger, the more simple and convenient the user programming, the easier it is to complete complex control tasks.
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