DLF01 109-0785-3B21-08
DLF01 109-0785-3B21-08
TSXAEY414
A2H124-24FX
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PLC系统
伺服数控系统
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更新热点:主营品牌系列Allen-Bradley
abb、Siemens、Fanuc、 福克斯波罗 _-_--— plc可编程控制器
Schneider、Westinghouse、Ge _-__- —dcs集散式控制系统
主营行业:电工电气 经营模式:贸易型单价:电议
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福州卓凯电子科技有限公司
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当PLC运行时,CPU就要执行用户程序中的操作。但是CPU不可能同时执行多个操作,只能分时地一个操作一个操作地执行。PLC利用系统软件在其内部建立了输入输出映像区,当PLC的CPU执行用户程序时,从输入映像区中读取输入信号的状态,进行相应的操作。当CPU执行完**个操作后,将操作结果输出到输出映像区,然后再执行第二个操作,操作结果送到输出映像区。在程序执行过程中,PLC并不读取输入信号的真正状态,执行结果也并没有输出到PLC外部。只有当程序执行到结束指令(END)时,将输出映像区中执行结果向PLC外部输出一次,将输入信号的状态读取一次送到输入映像区。对输入输出信号的这一操作过程称为I/O刷新。I/O刷新完成后,CPU再从用户程序的**条指令开始,进行下一次程序执行。PLC的这种工作方式被称为扫描方式。
PLC的扫描周期包括上电后初始处理、共同处理、上位链接服务、外设服务、运算处理、I/O刷新。Phoenix Contact Subcon 9/M-SH 2761509
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