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Expansion Data Memory
An
Expansion Data Memory Unit may be used only in a CV1000-CPU01-EV1,
CV2000-CPU01-EV1, or CVM1-CPU21-EV2 CPU. The Expansion Data
Memory
Unit fits into the slot located on the upper left side of the CPU. The Ex
-
pansion
Data Memory Unit is optional. There are three models of Memory Units
available
with dif
ferent memory capacities. The
addition of an Expansion Data
Memory Unit increases the data memory capacity of the CV1000, CV2000, or
CVM1-CPU21
from 24K words (D00000 to D24575) to up to 256K words. Refer
to the
CV-series PC Operation Manual: Ladder Diagrams
for details on PC
memory and addressing conventions.
Model Memory capacity Word assignment
CV1000-DM641 64K words E00000 to E32765 x 2 banks
CV1000-DM151 128K words E00000 to E32765 x 4 banks
CV1000-DM251 256K words E00000 to E32765 x 8 banks
When
mounted to the CPU, the Expansion Data Memory Unit is backed up by
the battery mounted in the CPU. Provided the Unit has been mounted to the
CPU for a duration of at least 1 minute, a charged capacitor built-in to the
Memory
Unit allows the Unit to be removed from the CPU for up to 10 minutes
without memory loss.
Memory
element
Pullout
lever
Backup
capacitor
Expansion Data Memory Unit
CPU
connector
Rack Components Section 2-3
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