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(1)PLC的类型
PLC按构造分为全体型和模块型两类,按运用环境分为现场设备和操控室设备两类;按CPU字长分为1位、4位、8位、16位、32位、64位等。从运用视点动身,一般可按操控功用或输入输出点数选型。全体型PLC的I/O点数固定,因而用户挑选的地步较小,用于小型操控体系;模块型PLC供应多种I/O卡件或插卡,因而用户可较合理地挑选和装备操控体系的I/O点数,功用拓展便利灵敏,一般用于大中型操控体系。
(2)输入输出模块的挑选
输入输出模块的挑选应思考与运用恳求的一起。例如对输入模块,应思考信号电平、信号传输距离、信号阻隔、信号供电办法等运用恳求。对输出模块,应思考选用的输出模块类型,一般继电器输出模块具有报价低、运用电压规模广、寿数短、呼应时刻较长等特色;可控硅输出模块适用于开关频频,电理性低功率因数负荷场合,但报价较贵,过载才干较差。输出模块还有直流输出、沟通输出和模仿量输出等,与运用恳求应一起。可依据运用恳求,合理选用智能型输入输出模块,以便进步操控水平和降低运用本钱。思考是不是需求拓展机架或长途I/O机架等。
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