On Sep 27, 7:24*pm, Karl Townsend
wrote:
Is this unit completely passive, only lights and switches, or does it
contain active circuitry? Even relays count, coils with kickback
diodes have a polarity and you may have to energize them to find the
normally-open contact.

Passive, several lamps, pushbuttons, rotary switches, and a few
toggles. One MPG (manual pulse generator - like an encoder)



How easily can you connect to it? Are you holding meter probes on pins
or can you plug in a wired connector and make solid hands-free
connections?

jsw

Right now I have two 30' cables with an end on it that plugs into a
Fanuc 6 computer board header. The cables are at least 20' too long.
Somebody suggested all the spares are likely tied to ground. It looks
like on the computer end only. I don't have the compter here right now
and i can't find any conductors going to ground. I'll get the computer
back and focus on finding the spares first. Like somebody said, this
will cut the problem in half.

From there, I guess I'm planning on *hooking each wire up to an Opto22
input. They have an LED that will light when they see power. Its only
fifty wires, once its all connected i should be able to toggle an
input and see which opto fires.

Karl

If you can put stripped, numbered wires in the mate of that Fanuc
connector you can check resistance between each wire and all the
others, clipped together.

Closed switch contacts are shorts which open when you flip that
switch, lamps should show a filament resistance. You might be able to
make them glow slightly by powering them with a battery and series
limiting resistor or light bulb. But be sure the voltage and current
from the battery won't hurt anything. A car side marker bulb might
work.

After you marked and eliminated the bulbs and closed contacts, the
open contact wires should be easier.

jsw