Experimental Physics and
Industrial Control System

[email protected] (Bob Dalesio) · Wed, 23 Nov 94 15:56:15 MST

Thermocouple modules in Allen-Bradley have 8 signals per card. However,
the driver is currently configured to be in dual-slot addressing mode - which
means that input cards are in the even slots and output cards are in the odd
slots. This limits the number of thermocouple cards to 6 per crate. That's 48
channels per crate. What you need to be careful of is the signal conditioning.
Allen-Bradley has handled all of this for you. The signals are cold junction
compensated and linearized. There are some VME modules available for this,
but I don't know what the wiring, distribution, or signal conditioning situation
is.

I strongly recommend against PLC programming. The ladder logic is difficult to
maintain.

Several steppermotor solutions exist in VME. I am most familiar with the Oregon
Micro System 4,6, and 8 axis motor drivers. These need signal conditioning. We
are happy to provide this, or you can develop it. We have motors that are
1500' from the controller that are controlled acurately - no lost pulses, no
line length matching problems.

Let me know if there is anything I can do to help. I would be interest in 
helping evaluate alternative solutions.

	Bob

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System