Modular Cpus - GE 90-30 PLC Series Installation And Hardware Manual

5
Replaceable System (firmware) PROM
Memory Backup
Warning Label
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:
5-2 Series 90-30 PLC Installation and Hardware Manual – August 2002
PROGRAMMABL
CONTROLLER
Description Label
BASE 5-
Says "With CPU"
WITH CPU
CAUTION
USER
AND REGISTER
VALUES MAY BE
LOST IF POWER
SUPPLY IS
REMOVED FOR
LONGER THAN
1 HOUR
POWER
SUPPLY
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.
Socket for Optional Program PROM
SYSTEM PROGRA
PROM PROM
1
NON-CPU SLOTS
C
P
U
I/O-1 I/O-2 I/O-3
a44563A
I/O-4 I/O-5
GFK-0356Q