2017/12/6 17:47:00 来源： 福建鸿飞达自动化科技有限公司
有单机支持300回路和65000点I/O的大型对应中型PLC以上，均采用16位~32位CPU，微、小型PLC原采用8位CPU，根据通讯等方面要求，有的也改用16位~32位CPU。由于I/O64点以下PLC销售额占整个PLC的47%，64点~256点的占31%，合计位整个PLC销售额的78%，所以对微、小型PLC应多加研究。
3.2 PLC的硬件
PLC控制器本身的硬件采用积木式结构，各厂家产品结构大同小异。以欧姆龙C200HE为例，为总线模板框式结构，基本框架(CPU母板)上装有CPU模板，其它槽位装有I/O模板;如果I/O模板多时，可由CPU母板经I/O扩展电缆连接I/O扩展母板，在其上装I/O模板;另一种是配备远程I/O从站等。这些都说明了PLC厂家将硬件各部件均向用户，便于用户选用，配置成规模不等的PLC，而且这种硬件配置的开放性，为制造商、分销商(代理商)、集成商、终用户带来很多方便，为供应链带来很大便利，这是一大成功。
PLC内的I/O模板，除一般的DI/DO、AD/DA模板外，还发展了一系列特殊功能的I/O模板，这为PLC用于各行各业打开了出路，如用于条形码识别的ASCII/BASIC模板，用于反馈控制的PID模板，用于运行控制、机械加工的高速计数模板、单轴位置控制模板、双轴位置控制模板、凸轮模板、射频识别接口模板等，这在以后还会有很大发展。另外在输入、输出的相关元件、强的输入、输出电隔离、地隔离等方面也会更加完善。
PLC中的CPU与存储器配合，完成控制功能。它与DCS处理温度、压力、流量等参数的不同，采用快速的巡回扫描周期，一般为0.1~0.2s，更快的则选用50ms或更小的扫描
【公 司】： 福建鸿飞达自动化科技有限公司
【主 营】： AB(罗克韦尔)PLC全系列、ABB机器人备件、施耐德140/TSX、西门子6SN/6FC、伺服全套等
【价 格】： 电议
【发布人】： 程先生
【电 话】： 15306977024 13625073704
【所在地】： 福建 - 福州
【坐 机】： 0591-83532940
【Q Q】： 2851617309
【传 真】： 0591-88263940
【邮 箱】： 2851617309@qq.com
产品价格以电话或者QQ询价为准，发布价格不做参考，图片也一样
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