Linear Motor Control

[ger1]

Hi, I am looking at an idea for a project at work. It involves using a Keyence Vision System (don't know model yet) to monitor a process and then give an output to drive a linear motor. The vision system is picking up a point on the product and will then move the linear motor to that point and a pneumatic cylinder will extend - cutting the product. I assume the vision system will give a digital signal equivalent to the distance the motor has to be moved. I am thinking of connecting the signal from the Vision system to a Mitsubishi PLC and using the PLC to drive the motor. Or is there linear motor systems out there that can accept a signal and move proportionally? I'm open to any suggestions as I am in the early stages of this project. Thanks

[JRoss]

You'll need more than a single digital (on-off) piece of data for that application. I think you mean analog. First order of business is to find out what type of output the vision system provides. That will narrow the field somewhat. Possibilities are analog (4-20mA or 0-10V) or some sort of communications (serial, Ethernet/IP, Modbus, etc.). Second, to you need an all-in-one linear motor, or can you use a standard servo system with a ball-screw or some other type of linear actuator. If you have flexibility, it gives you more options and probably a better price. Yes, there is probably a stand-alone system that will meet your needs. Control Techniques Epsilon series comes to mind. But make sure you don't box yourself in if you think you might want to expand the system later and need PLC control. Also, evaluate your comfort level with learning new programming styles and software. Control Techniques uses a more structured text style of programming which is rather different than ladder logic, for example. Maybe the hardware would be more expensive, but the solution cheaper/faster/better (pick two!) if you don't have to spend so much time developing and supporting it.

[ger1]

Thanks for this answer, it is a very good reply. I am digesting it all and will let you know how I get on. Regards,