Cpu Baseplates; Embedded Cpu Baseplates (Figures 3-2 And 3-3) - GE 90-30 PLC Series Installation And Hardware Manual

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CPU Baseplates

There are two basic kinds of CPU baseplates, embedded and modular. The embedded types fulfill
the need for a good low cost PLC, but lack the power, expandability, and versatility of the modular
systems.
Embedded CPU Baseplate: This type has CPU and memory integrated circuit chips soldered to
its backplane circuit board. All of its numbered slots, including slot 1, are of the same type, and
they accept only I/O modules and standard options modules.
Modular CPU Baseplate: This type does not have CPU and memory chips on its backplane.
Instead, it has a connector in Slot 1 for a plug-in CPU module, which contains the CPU and
memory chips on an internal circuit board. The slot 1 connector is a special type that only mates
with connectors on CPUs and a few special option modules.

Embedded CPU Baseplates (Figures 3-2 and 3-3)

There are three models of embedded baseplates, the 311, 313, and 323. These model numbers are
based upon the CPU type that each contains. This chapter discusses only the baseplate features of
these products. CPU specifications for the embedded CPU are located in Chapter 4. The
embedded CPU baseplates have the following features:
3-4 Series 90-30 PLC Installation and Hardware Manual – August 2002
The CPU type cannot be changed.
They do not support the use of expansion or remote racks, so these racks do not have an
expansion connector like the modular CPU baseplates do.
The models 311 and 313 are 5-slot baseplates, and the model 323 is a 10-slot baseplate.
Since they do not require a plug-in CPU module, all numbered slots, including Slot 1, can be
used for I/O or Option modules.
The memory back-up battery is located in the Power Supply module; so if the Power Supply is
unplugged from the baseplate, the battery will be disconnected from the memory circuits,
which are located on the backplane circuit board. However, the backplane circuit board
contains a high value capacitor, sometimes called a "super capacitor," that can store enough
charge to maintain the memory circuits for about 1 hour if the Power Supply is removed or its
battery is disconnected. Chapter 6 discusses the IC693ACC315 Battery Accessory kit that can
be used to maintain memory contents when the Power Supply is removed from an embedded
CPU baseplate.
There are no configuration switches or jumpers on the Model 311, 313, or 323 baseplates.
An embedded CPU baseplate is always assigned, by default, Rack Number Zero (0).
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