MDS-A-SVJ-03伺服器

MDS-A-SVJ-03  伺服器机型的选择 (一)PLC的类型 PLC按结构分为整体型和模块型两类，按应用环境分为现场安装和控制室安装两类；按CPU字长分为1位、4位、8位、16位、32位、64位等。从应用角度出发，通常可按控制功能或输入输出点数选型。 整体型PLC的I/O点数固定，因此用户选择的余地较小，用于小型控制系统；模块型PLC提供多种I/O卡件或插卡，因此用户可较合理地选择和配置控制系统的I/O点数，功能扩展方便灵活，一般用于大中型控制系统。 (二)输入输出模块的选择 输入输出模块的选择应考虑与应用要求的统一。例如对输入模块，应考虑信号电平、信号输距离、信号隔离、信号供电方式等应用要求。对输出模块，应考虑选用的输出模块类型，通常继电器输出模块具有价格低、使用电压范围广、寿命短、响应时间较长等特点；可控硅输出模块适用于开关频繁，电感性低功率因数负荷场合，但价格较贵，过载能力较差

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