Maintaining Ram Memory During Storage Or Shipment Of A Cpu; Modular Cpus; Embedded Cpus; Battery Accessory Kit (Ic693Acc315) - GE 90-30 PLC Series Installation And Hardware Manual

Maintaining RAM Memory During Storage or Shipment of a CPU

Modular CPUs

Modular CPUs have an internal connector for a backup battery so that RAM memory contents can
be retained while the CPU is being stored or shipped. This arrangement should not to be used
when the CPU module is installed in the baseplate and the backup battery is installed in the power
supply. To use a backup battery in the CPU module, it is necessary to remove the front cover of
the CPU module. This can be accomplished by following these steps:
The Battery Accessory Kit, described below, may also be used on a Modular CPU baseplate if the
power supply has to be removed. This would require leaving the CPU module mounted in the
baseplate.
Long-term battery backup can be provided with the use of the External Battery Module, described
on page 6-10.

Embedded CPUs

Embedded CPU Models 311, 313, and 323 can be stored or shipped with a power supply installed
and the power supply battery connected in order to maintain the contents of RAM memory.
However, another option (that doesn't require the use of a power supply) is to use the Battery
Accessory Kit, described next.

Battery Accessory Kit (IC693ACC315)

The Battery Accessory Kit (IC693ACC315) lets you maintain RAM memory contents without
using a power supply. It is useful for maintaining memory contents while a baseplate is being
stored or shipped. The Battery Accessory Kit consists of a battery with an attached connector
mounted on a circuit board. The circuit board has a connector that plugs into the power supply
backplane connector (see the figure below). The Battery Accessory Kit can be used on either
Embedded or Modular Series 90-30 CPU baseplates.
GFK-0356Q Chapter 6 Memory Backup/Battery Backup
To avoid losing memory contents once the CPU is removed from the PLC, we recommend you
install the backup battery into the CPU within 20 minutes. First, make sure PLC power is off,
then remove the CPU module.
Gently squeeze the front cover of the CPU module and pull it forward, away from the module
case, while gently pressing in on the 4 front cover tabs sequentially with a small screwdriver.
The front cover tabs latch into holes on each side of the module case (refer to Figure 2-1 for
location of front cover holding tabs).
After removing the front cover, plug the memory backup battery into the two-prong battery
connector on the front of the CPU module's printed circuit board.
While the battery is connected to the CPU, you will have to leave the CPU's front cover off.
Also, the battery should be temporarily secured to the module with cable ties or tape to keep it
from being accidentally damaged or disconnected.
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