Signal Assignments, 
EL-3035
Schematic: schematics\IN2.sch.pdf
Page last updated: June 21, 2002
Schematics EL-3034 through EL-3039 show the layout for one
each of the Opto-22 relay racks used in the instrument electronics. The sheets
have a block in the upper left-hand area that associates a channel number
and a bit number with a function. The channel number gives the location of
the I/O module on the individual rack. The bit number gives the I/O bit that
the software can read or write and the function tells what the bit toggles
or reads.
In the lower left area is a pictorial representation of the
actual I/O rack. The drawing shows where the relays are and what their function
is. It also tells what relay should be plugged into each slot. Notice that
between each relay and its screw terminal is noted what color relay should
be installed. The other important piece of information shown here is the position
of the various bus bars. These are Sheet metal strips that are used to connect
from two to eight terminals together.
On the right-hand side of the drawing is a table showing the destination
or the output connections of the I/O relays. The first column gives the
I/O bit for programming. The pin column refers to the screw terminals on
the edges of the relay racks. The next three columns give the connector
and pin numbers that the output is connected to. The sixth column tells
what relay part number populates each position on the relay rack. The last
column tells the function that the relay controls. On the right-hand side
of the table are the channel numbers as labeled on the board.
Board #2 Controller #1 - Inputs