GE PACSystems RX7i Reference Manual page 188

Energy Pack Status Bit Operation
As shown in the table below, the CPU application program can monitor the status of the attached Energy
Pack via %S0014 (PLC_BAT) and %SA0011 (LOW_BAT). For more details, refer to the chapter on
Diagnostics in PACSystems RX7i and RX3i CPU Programmer's Reference Manual, GFK-2950.
PLC_BAT
(%S0014)
0
1
0
The LEDs on the Energy Pack also indicate its status. Refer to the documentation for each product for
corresponding LED status.
Energy Pack Replacement
If an Energy Pack fails, you can replace it while the CPU is in operation. Use a compatible new unit or a
compatible replacement Cap Pack. Whenever an Energy Pack is replaced, the newly installed Cap Pack
must build up its charge.
In the case of ACC402 attached to CPE330, the Energy Pack, when hot-swapped, draws minimal current
in order to recharge: it may therefore take up to 10 minutes for ACC402 to charge completely. This is
normal operation. Similarly for ACC403/CPE400.
If a loss of power occurs while the Energy Pack is disconnected, or before the capacitors are fully charged,
memory loss may occur.
CPE330/ACC402 Status Detection & Fault Reporting
Both the CPE330 and ACC402 contain intelligence, allowing each to determine the status of the other.
This permits the CPU to report various conditions to the user via the status bits discussed in Energy Pack
Status Bit Operation.
Whenever the CPE330 detects any kind of issue with the ACC402 Energy Pack, it resumes normal
operation and issues warnings or faults to the user. The table below details the various permutations
possible at power-up. If the Cap Pack is removed during normal operation, this fault will be reported as
a failed battery fault.
Energy Pack Base
Not present
(removed or failed)
Not present
(bad base)
Present
(good base)
Present
(good base)
Present
(suspicious)
GFK-2222AD
LOW_BAT
(%SA0011)
0
1
1
Cap Pack CPE330 power-up response
Detects missing ACC402 and boots up immediately but does not
Not present
use any stored memory when resuming operations. Issues fail
(removed or failed)
battery fault.
Detects missing ACC402 and boots up immediately but does not
Present
use any stored memory when resuming operations. Issues fail
(good cap pack)
battery fault.
When the CPU does not see a fully charged status within 90
Not present
seconds, it does not use any stored memory when resuming
(removed or failed)
operations. Issues fail battery fault.
The CPU will wait for fully charged status within timeout period
Present
and then resume operation using the contents of memory
(good cap pack)
retained at the previous loss of power event
If the CPU does not see a fully charged status within 90 seconds,
Present
it does not use any stored memory when resuming operations.
(suspicious)
Issues fail battery fault.
April 2018
Energy Pack Status
Energy Pack connected and operational (may be charging)
Energy Pack not connected or has failed
Energy Pack is nearing its end-of-life and should be replaced.
Chapter 4. CPU Operation
177