1746-A4
1746-A4
1746-A4
（一）开关量I／O模块的选择
1. 开关量输入模块的选择
开关量输入模块是用来接收现场输入设备的开关信号，将信号转换为PLC内部接受的低电压信号，并实现PLC内、外信号的电气隔离。选择时主要应考虑以下几个方面：
1）输入信号的类型及电压等级
开关量输入模块有直流输入、交流输入和交流／直流输入三种类型。选择时主要根据现场输入信号和周围环境因素等。直流输入模块的延迟时间较短，还可以直接与接近开关、光电开关等电子输入设备连接；交流输入模块可靠性好，适合于有油雾、粉尘的恶劣环境下使用。
开关量输入模块的输入信号的电压等级有：直流5Ｖ、12Ｖ、24Ｖ、48Ｖ、60Ｖ等；交流110Ｖ、220Ｖ等。选择时主要根据现场输入设备与输入模块之间的距离来考虑。一般5Ｖ、12Ｖ、24Ｖ用于传输距离较近场合，如5Ｖ输入模块远不得过１０米。距离较远的应选用输入电压等级较高的模块。
◆ 企业名称：厦门泰尼电气有限公司
◆ 主营业务：DCS,PLC
◆ 经营模式： 贸易
◆ 贸易地区：
◆ 联系人： 小黄《女士》
◆ 电话：
◆手机：
◆ QQ:2917675397
◆ 传真： （备注“01006”收）
◆ E-mail： 2917675397@qq.com
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