GFK-0356Q Chapter 5 CPUs 5-3
5
CPU/1
POWER
E
X
P
A
N
S
I
O
N
BASE 5-SLOT
PROGRAMMABLE
CONTROLLER
USER PROGRAM
CAUTION
SUPPLY
AND REGISTER
VALUES MAY BE
LOST IF POWER
SUPPLY IS
REMOVED FOR
LONGER THAN
1 HOUR
Memory Backup
Warning Label
CPU Slot (Slot 1)
I/O Bus
Expansion
Connector
C
P
U
NON-CPU SLOTS
I/O-2 I/O-3 I/O-4 I/O-5
Figure 5-2. IC693CHS397 5-Slot Modular CPU Baseplate
General CPU Features
Microprocessor
The microprocessor type varies by the CPU model:
Ŷ 80188 microprocessor for CPU models 311/313/323/331
Ŷ 80C188XL microprocessor for CPU models 340/341
Ŷ 80386EX microprocessor for CPU models 350-364
Ŷ 586 microprocessor for CPU model 374
The microprocessor provides all fundamental sweep and operation control, and execution of all
non-boolean (as used here, the term boolean refers to discrete logic such as contacts and coils)
functions. Boolean functions in the modular CPUs are handled by a dedicated VLSI (Very Large
Scale Integration) Instruction Sequencer Coprocessor (ISCP). All Series 90-30 CPUs use RAM
working memory.
CPU Serial Port (Connector on Power Supply)
A 15-pin D-type female connector, accessed by opening the hinged door on the right front of the
power supply, provides the connection to a CPU serial port which is used to connect to:
Ŷ a programmer (usually a personal computer) running GE PLC programming software.
The IC690ACC901 Miniconverter/cable kit is a convenient way to access this port. See
Appendix D for details.
Ŷ the IC693PRG300 GE Hand-Held Programmer (CPU374 does not support the HHP.)
See Chapter 11 for details.
Ŷ the IC200ACC003 EZ Program Store device. See GFK-1811 for details. (CPU374 only)
Ŷ other serial devices.