Rockwell Automation T3122 ICS Regent Processor Modules - Manual (Page 9)

Processor Modules (T3110, 11, 12, 20, 21, and 22)
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Application
Processor module type should be selected based on the main
input power voltage (110 VAC, 220 VAC, or 24 VDC) and on
memory requirements (128 kbytes or 512 kbytes). Each
memory size supports all programming functions and up to 16
chassis of I/O. Typically, systems with more that 300 I/O
points will require 512 kbytes of memory due the larger
program size, increased data handling, etc.
In W INTERPRET developed systems, approximately 64K bytes
of memory are used to store the RAMcode portion of the
operating system (27K) and internal workspace memory (37K)
required for miscellaneous system features.
Maintenance
Each of the Regent's processor modules has a replaceable
lithium battery. These batteries provide sufficient backup
power to prevent loss of memory during a power failure.
The batteries have a shelf life of approximately 10 years.
When providing power to the module's memory during a
power failure, the battery can provide backup power to a
processor module's memory for approximately six months.
Battery Replacement
Because you must remove processor modules before replacing
their batteries, always check the indicator lights on the
remaining processor modules before removing a module for
battery replacement. Verify that the other two processor
modules are healthy (No red PROC LEDs) and are running
(RUN LEDs are flashing). This is important to avoid causing
a failure to the system – since the system will shut down if it
detects a second processor fault.
To replace the battery in a processor module remove the
module from the controller chassis and lay the module on its
side so that the battery is accessible. See Figure 4.
Note:
Important!