ITT Gould model 1ST 1E5D4
ITT Gould model 1ST 1E5D4
ITT Gould model 1ST 1E5D4
1．存储容量
存储容量是指用户程序存储器的容量。用户程序存储器的容量大，可以编制出复杂的程序。一般来说，小型PLC的用户存储器容量为几千字，而大型机的用户存储器容量为几万字。
2．I/O点数
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。
3．扫描速度
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。
4．指令的功能与数量
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。
5．内部元件的种类与数量
在编制PLC程序时，需要用到大量的内部元件来存放变量、中间结果、保持数据、定时计数、模块设置和各种标志位等信息。这些元件的种类与数量越多，表示PLC的存储和处理各种信息的能力越强。
6．特殊功能单元
特殊功能单元种类的多少与功能的强弱是衡量PLC产品的一个重要指标。近年来各PLC厂商非常重视特殊功能单元的开发，特殊功能单元种类日益增多，功能越来越强，使PLC的控制功能日益扩大
7．可扩展能力
PLC的可扩展能力包括I/O点数的扩展、存储容量的扩展、联网功能的扩展、各种功能模块的扩展等。在选择PLC时，经常需要考虑PLC的可扩展能力。
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