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| (点击题目可以 在互联 网中搜索该题 目的相关内容) 日期：2006-11-27 23:47:59 来源： 作者： 点击： | |
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We intend to upgrade a PLC5 control system to ControlLogix. It is our intention to use the existing PLC5 I/O by removing the 5/25 processor and replacing with a 1771-ASB and connectiong via RIO to a 1756-DHRIO card in the new ControlLogix chassis. Setting this up looks reasonably straight forward to talk to the Digital I/O, however we are a little unsure as to how to approach the Analogs. Has anybody done this before and if so your help would be appreciated. I have done a few PLC5 , PLC5/250, and PLC 3 conversions to Contrologix. The 1771 analogs are treated the same with BTR and BTW instructions except using the MSG instruction, which has the Block Transfer Reads and Writes as a message type. Another option would be to go Controlnet, but I realize the RIO blue hose is already in place. |
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