drforsythe
Lifetime Supporting Member
I am trying to help out a company who has no technical support and they are far away from my locale. We are trying to sense when a roll of paper is getting low. I plan to use either an ultrasonic or laser distance sensor with 4-20mA output. I do this all the time with a PLC and HMI. The operator can either change the setpoint via recipe selection or manual entry. Either technology works fine in the PLC applications I have done. I would like to do the same thing, only this time without the PLC and HMI.
I would like to find a device (like a panel meter) that can take a potentiometer signal into one channel and the distance sensor into a second channel. The potentiometer input would be displayed and act as the setpoint. The distance sensor would also be displayed and act as the process value. When the process value is greater than the setpoint (or lesser, depending on configuration), I would like an output to turn on.
I looked around a bit on the web and checked out Red Lion, but have not found something yet. I have a feeling the low technology that I am requiring is going to be the roadblock. If anyone has a suggestion, I would appreciate it. Thank you in advance.
I would like to find a device (like a panel meter) that can take a potentiometer signal into one channel and the distance sensor into a second channel. The potentiometer input would be displayed and act as the setpoint. The distance sensor would also be displayed and act as the process value. When the process value is greater than the setpoint (or lesser, depending on configuration), I would like an output to turn on.
I looked around a bit on the web and checked out Red Lion, but have not found something yet. I have a feeling the low technology that I am requiring is going to be the roadblock. If anyone has a suggestion, I would appreciate it. Thank you in advance.