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BlurDavinci

Cam Positioner

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Hi Guys: I would like to know how can I do this in Controllogix. Electronic Cam Positioner with Absolute Encoder. Which module should use? What Instruction in Ladder That I should use? I did that with Omron PLC using Omron Gray Code Instruction. The Absolute Encoder is 8 bits (8 input to a normal discrete input (transistor type). The Gray Code Instruction will convert the value into Degree, using comparison instruction, I could check for Start and End Angle! So I could as many combination that could be use for machine operation. Is there any similar funciton in AB? I came across Electronic Cam Profile in RSLogix5000, I thought that is use only for Servo Driver, Am I correct? Thanks

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conversion to and from gray code is quite simple: http://www.plcdev.com/the_black_and_white_of_gray_code http://www.plcdev.com/using_ladder_logic_f...code_conversion there was also an AB application note that shows same way how to do it in ladder in case special instruction is missing. i think it's this one (you will have to click on image to expand it): http://www.ab.com/sensors/support/reach/fa.../nov2000/1.html cam profile is used for non-linear conversion where relationship cannot be defined easily by formula. it is just a lookup table. while it should be usable for this case as well, it is not practical to enter so many values for something this simple (even 8-bit would require 256 values).

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