1794-IM8

 1794-IM8

1794-IM8

1794-IM8

 2. 开关量输出模块的选择

开关量输出模块是将PLC内部低电压信号转换成驱动外部输出设备的开关信号，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）输出方式

开关量输出模块有继电器输出、晶闸管输出和晶体管输出三种方式。

继电器输出的价格便宜，既可以用于驱动交流负载，又可用于直流负载，而且适用的电压大小范围较宽、导通压降小，同时承受瞬时过电压和过电流的能力较强，但其属于有触点元件，动作速度较慢（驱动感性负载时，触点动作频率不得超过1HZ）、寿命较短、可靠性较差，只能适用于不频繁通断的场合。

对于频繁通断的负载，应该选用晶闸管输出或晶体管输出，它们属于无触点元件。但晶闸管输出只能用于交流负载，而晶体管输出只能用于直流负载。

◆ 企业名称：厦门泰尼电气有限公司

◆ 企业性质： 有限责任公司

◆ 主营业务：DCS,PLC

◆ 经营模式： 贸易

◆ 贸易地区： 全国

◆ 联系人： 小黄（女士）

◆ 电话：0592-6809319

◆ 手机：18950191386   

◆ QQ:2917675397

◆ 传真：0592-6890859 （备注“01006”收）

◆ E-mail： 2917675397@qq.com 

◆ 邮政编码： 361026

◆地址：厦门市海沧区海沧农场海农北里17号

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