Rockwell Automation T71xx Regent+Plus Processor Modules 110 VAC, 220/240VAC and 24VDC - Manual (Page 8)

Processor Modules (T7110, 11, 12, 20, 21, and 22)
8 (Issue 1) I n d u s t r i a l
C o n t r o l S e r v i c e s
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
To replace the battery in a processor module, lift the cover at the
bottom of the front panel,by easing the two retaining clips with a
screwdriver. Carefully remove the battery clips from the battery. Fit
a new battery, taking care to route the wires back inside the
module. Close the cover.
Replacing the battery on a live module will not cause a shutdown.
Note: