Smithy Ez-Trol2 - Manual (Page 66)

ADDING COMPONENTS
OPEN ARCHITECTURE LAYOUT
(Easy Upgrade of Computer Components)
The open architecture and layout of the control’s electrical components, as well as the design
requirement to use industry standard sized components provides the ability to upgrade components
as inevitable techinical advances continue to provide more processing power and capabilities. The
use of industry standard “plug and play” components makes upgrading your system easier at a much
lower cost.
UPGRADED I/O CAPACITY
The control system’s Mesa Board 5I20 card has 72 I/O bits which unlike other parallel port designs
which only have 17 I/O bits. This Mesa Board utilizes 24 bits out of the 72 I/O bits that are available.
More I/O means it can support many accessories to be operated simultaneously. Examples are
probes, ligths, pendants and more.
This control box also have individual imput for home and limit switches. This allows you to have
additional information and meaningful input while working at the user’s interface. Since the I/O
communicates at such high speed, the control box can support hish resolution spindle encoders
that are necessary for most lathe operations like thread cutting. The high speed signals are sent via
RS422 differential signaling.
A bit of I/O is defined as a single or double wire that programs a simple on and off operation.
TO ADD A SIMPLE TURN ON/OFF PROGRAM
To add a simple program, make sure that you have the corrent I/O bits available on your Mesa Board
5I20.
Step 1: Get another interface board. Use a MESA Electronics 7I47 RS-422 Interface Board for any
program.
Step 2: Plug the interface board to the MESA Board 5I20 ‘s unused port using ribbon cables. You
may srew the new itnerface board on the din rails on the control box. Don’t forget to label the new
interface so that you will not be confused when you wire and make repairs.
Step 3: Wire the itnerface board to the terninal boards to run the newly installed interface board.
Make sure that you have the right wiring plugged in before you run the new program.
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