Help!

Hello all,

I am attempting to create a fault of a device. I am adding logic to an existing program. I am measuring travel(encoders) and the only values I have are velocity for the to devices(individual reading) . I want to create a fault if one device stops. I want to allow a small tolerance (about 8 in sufferance between the 2 values) due to the two reals never being exactly the same. Thanks for the help.

So you simply subtract one from the other, get the absolute value (if LES 0, NEGate it), and compare it (is it greater than?) with your tolerance. You may also want to have a timer to delay the fault for things like starts with slack or other anomalies that may only last a few milliseconds.