EngiLab Beam requires that units be kept consistent throughout. (i.e. it doesn't support specific units - your output is in the units of the input) I've been entering variables in pounds and inches (i.e. for hemlock 8x8 inch beams I'm using inches and pounds, E= 1,100,000 psi, A= 64sq in, I=341 in^4). For element loads, I've determined the total roof or floor area attributed to the truss/bent and multiply that times design loads, then divide it by length of the element in inches. The resulting number is what I've been entering into the f variable. (i.e. pounds per lineal inch).

I hope that it's warmer wherever you're traveling. My mercury stood very short this morning at 28 degrees below zero.

Best,
~ Kevin