ALLEN BRADLEY 1747-L551 PLC Processor

6–4
Installing Your Hardware Components
4. Install the processor module into the chassis.
5. Restore power to the controller.
Removing the Memory Module
To remove a memory module use the following procedure:
1. Remove power and pull out the processor.
2. Grasp the carrier tabs (or connector for the SLC 5/03, SLC 5/04,
and SLC 5/05) with your thumb and index fingers, then gently
but firmly lift upwards on either end of the memory module
carrier.
3. When the end is partially raised, begin lifting the other end in the
same manner. Repeat this until the memory module has been
completely removed from the socket.
SLC 5/03, SLC 5/04, and SLC 5/05 Operating System Memory
Module
The SLC 5/03, SLC 5/04, and SLC 5/05 processors use an operating
system memory module to download new firmware. Take anti-static
precautions when upgrading the operating system.
!
Note:
Note:
ATTENTION: PROMs are electrostatic sensitive
devices. Do not handle without proper grounding
precautions. Do not install PROM with power applied
to the processor.
If an SLC 5/03 processor is running the new OS302
operating system, that SLC 5/03 processor has 321
instruction words less memory available for the user
program than a processor running the OS300 or OS301
operating systems. Therefore, if you have a program
for an OS300 or OS301 operating system that is near
maximum capacity, saving the program as an OS302
program may result in an error. Save the program as an
OS300 or OS301 program instead.
If you upgrade an SLC 5/04 OS 400 processor to an
SLC 5/04 OS401 processor, you will now have 28K of
user instructions and 4K of data words. OS400
programs are not affected but are limited to the program
size offered by the SLC 5/04 OS400 processor.
Therefore, to make use of the additional 8K of user
instructions, you need to resave your program offline
after selecting OS401 operating system.
Publication 1747-6.2