¥ 价格面议
¥ 价格面议
¥ 价格面议
¥ 价格面议
易卖工控网(www.ymgk.com)提供”LMT100 控制模块”,产品详情:品牌/厂家:其他品牌、型号:LMT100、成色:全新、货期:期货 7天内发货、保修:365天,更多产品详情就上易卖工控网。
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早期的PLC一般称为可编程逻辑控制器。这时的PLC多少有点继电器控制装置的替代物的含义,其主要功能只是执行原先由继电器完成的顺序控制,定时等。
在70年代,微处理器的出现使PLC发生了巨大的变化。美国,日本,德国等一些厂家先后开始采用微处理器作为PLC的中央处理单元(CPU)。
这样,使PLC得功能大大增强。在软件方面,除了保持其原有的逻辑运算、计时、计数等功能以外,还增加了算术运算、数据处理和传送、通讯、自诊断等功能。在硬件方面,除了保持其原有的开关模块以外,还增加了模拟量模块、远程I/O模块、各种特殊功能模块。并扩大了存储器的容量,使各种逻辑线圈的数量增加,还提供了一定数量的数据寄存器,使PLC得应用范围得以扩大。