GE Series 90-30 PLC

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