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I'm new to automation and have been doing a lot of research on the various topics of automation using a PLC. I understand that in most applications in order to control a variable speed motor it requires a variable speed drive. However, my question is, if the ventilation fan system currently has a variable speed fan with manual controller in the building, can I connect a PLC to the controller to gather the necessary information to control the fan? Any other suggestions that you have would be great. The PLC I'm looking to implement is a Automation Direct Direct Logic 06.