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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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