GE 90-30 PLC Series Installation And Hardware Manual page 83

3
Expansion Rack Connection Example
The following example shows a system that includes Expansion baseplates.
Figure 3-12. Example of Connecting Expansion Baseplates
3-14 Series 90-30 PLC Installation and Hardware Manual – August 2002
PROGRAMMER
*NOTE
Each signal pair on the I/O bus must
be terminated at the end of the I/O
bus with120 ohm resistors. This
mination can be done with the I/O ter
Bus Terminator Plug (IC693ACC307),
by using the 50 foot (15 meter) cable
(IC693CBL302) with built-in terminat
ing resistors, or by building a
cable with the resistors installed custom
in the connector at the end of the
bus.
CPU BASEPLATE
C
SERIAL
P
U
DISCRETE/ANALOG/OPTION
EXPANSION BASEPLATE
DISCRETE/ANALOG/OPTION
EXPANSION BASEPLATE
DISCRETE/ANALOG/OPTION
EXPANSION BASEPLATE
DISCRETE/ANALOG/OPTION
EXPANSION BASEPLATE
DISCRETE/ANALOG/OPTION
NOTE
TOTAL MAXIMUM
DISTANCE FROM
CPU BASEPLATE
TO LAST EXPANSION
BASEPLATE IS
50 FEET (15 METERS)
I/O EXPANSION CABLES
I/O BUS
TERMINATOR
PLUG (See *NOTE)
IC693ACC307
GFK-0356Q