Host Engineering Forum

General Category => Do-more CPUs and Do-more Designer Software => Topic started by: opburg89 on July 23, 2026, 08:29:15 PM

Title: Use of LVDT for closed loop feedback versus rotary Encoder
Post by: opburg89 on July 23, 2026, 08:29:15 PM

Good afternoon,
Is there any information for using an LVDT transducer with a 4-20mA analog output signal instead of a standard rotary style encoder for the closed-loop feedback
for a single Axis setup configured within Do-more? It appears if I'm reading correctly that you need to use a standard pulsed rotary encoder for the position/velocity feedback input?
The application we are using it on has a Hydraulic cylinder with an integrated 4-20mA LVDT transducer analog feedback and the cylinder is being controlled by a +/-10vdc
hydraulic proportional valve. Thanks in advance!

Title: Re: Use of LVDT for closed loop feedback versus rotary Encoder
Post by: MikeS on July 28, 2026, 08:35:49 AM

You're correct that our Axis implementation is directed toward motor control, so pulse inputs and pulse outputs are the expected I/O.

Your inputs and outputs are 4-20mA and +/-10VDC, which is more attuned to standard PID loop control.