GE Series 90-30 PLC - Modular CPUs

5-2 Series 90-30 PLC Installation and Hardware Manual – August 2002 GFK-0356Q
5
a44563A
POWER
1
BASE 5-
USER
PROGRAMMABL
CONTROLLER
SYSTEM
PROM
PROGRA
PROM
CAUTION
SUPPLY
A
ND REGISTER
V
ALUES MAY BE
LOST IF POWER
SUPPLY IS
REMOVED FOR
LONGER THAN
1 HOUR
WITH CPU
Memory Backup
Warning Label
Description Label
Says "With CPU"
Replaceable System (firmware) PROM
Socket for Optional Program PROM
I/O-1 I/O-2 I/O-3 I/O-4 I/O-5
NON-CPU SLOTS
C
P
U
Figure 5-1. Models 311 and 313 (5-Slot) Embedded CPU Baseplates
Modular CPUs
The modular CPUs consist of a CPU, memory, and associated integrated circuit chips soldered to
circuit board which is mounted in a plug-in module. The modular CPUs include the model CPU331
and higher. The modular CPUs have the following basic features:
■ A CPU module must be installed in Slot 1 of a modular CPU baseplate. Slot 1 is a unique size
and type that only fits a CPU module (or special Option modules). Slot 1 is labeled CPU/1.
Details on modular CPU baseplates are located in Chapter 2.
■ Modular CPUs support expansion and remote baseplates, so A 25-pin D-type female
expansion connector is located at the right end of the CPU baseplate for connection to an
expansion or remote baseplate.
■ Since the CPU is modular, it can readily be replaced or changed to a different type if desired.
■ Only one CPU is allowed per system, and it must be mounted in a CPU baseplate. If more
than one baseplate is used in a system, the additional ones must be either expansion or remote
types that do not contain a CPU.
■ A modular CPU baseplate is always assigned, by default, Rack Number 0.
■ All have a time-of-day (TOD) clock.