3G8F7-DRM21-E;
供应3G8F7-DRM21-E;
3G8F7-DRM21-E;
机型的挑选
(一)PLC的类型
PLC按结构分为全体型和模块型两类,按运用环境分为现场装置和控制室装置两类;按CPU字长分为1位、4位、8位、16位、32位、64位等。从运用角度动身,通常可按控制功能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,用于小型控制系统;模块型PLC供给多种I/O卡件或插卡,因而用户可较合理地挑选和装备控制系统的I/O点数,功能拓展方便灵敏,通常用于大中型控制系统。
(二)输入输出模块的挑选
输入输出模块的挑选应思考与运用请求的统一。例如对输入模块,应思考信号电平、信号传输间隔、信号阻隔、信号供电方法等运用请求。对输出模块,应思考选用的输出模块类型,通常继电器输出模块具有报价低、运用电压规模广、寿命短、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,过载才能较差。输出模块还有直流输出、交流输出和模仿量输出等,与运用请求应共同。
可依据运用请求,合理选用智能型输入输出模块,以便进步控制水平缓降低运用本钱。
思考是不是需求拓展机架或远程I/O机架等。
(三)电源的挑选
PLC的供电电源,除了引进设备时一起引进PLC应依据商品说明书请求规划和选用外,通常PLC的供电电源应规划选用220VAC电源,与国内电网电压共同。主要的运用场合,应选用不间断电源或稳压电源供电。
假如PLC自身带有可运用电源时,应核对供给的电流是不是满足运用请求,不然应规划外接供电电源。为避免外部高压电源因误操作而引进PLC,对输入和输出信号的阻隔是必要的,有时也可选用简单的二极管或熔丝管阻隔。
(四)存储器的挑选
因为计算机集成芯片技能的发展,存储器的报价已降低,因而,为确保运用项目的正常投运,通常请求PLC的存储器容量,按256个I/O点至少选8K存储器挑选。需求杂乱控制功能时,应挑选容量更大,层次更高的存储器。
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