1747-L543
1747-L543
1747-L543
PLC控制取代继电器控制已是大势所趋,如果用PLC改造继电器控制系统,根据原有的继电器电路图来设计梯形图显然是一条捷径。这是由于原有的继电器控制系统经过长期的使用和考验,已经被证明能完成系统要求的控制功能,而继电器电路图又与梯形图有很多相似之处,因此可以将继电器电路图经过适当的“翻译”,从而设计出具有相同功能的PLC梯形图程序,所以将这种设计方法称为“移植设计法”或“翻译法”。
在分析PLC控制系统的功能时,可以将PLC想象成一个继电器控制系统中的控制箱。PLC外部接线图描述的是这个控制箱的外部接线,PLC的梯形图程序是这个控制箱内部的“线路图”,PLC输入继电器和输出继电器是这个控制箱与外部联系的“中间继电器”,这样就可以用分析继电器电路图的方法来分析PLC控制系统。
◆ 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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COGNEX 800-5741-1 MODEL IN-SIGHT 1000 SENSOR ***XLNT***
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COGNEX VPM-8120X-5060 VM28A 801-8130-01K FRAME GRABBER
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COGNEX In-Sight 5400 Vision Sensor+1450 Module/Lens/LED
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Cognex In-sight 1010 800-5749-1 Breakout Module Q new
Cognex Vision Processor Module 800-5758-1 Revision J
Cognex VISION SYSTEM INSIGHT 4000 W/CABLE and IO Module
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