Memory Packs - Omron C1000H Installation Manual

Memory Packs

2-13 Memory Packs

RAM Pack
Caution
!
The Memory Pack fits into the slot located on the right side of the CPU. Because
the Memory Pack is not provided with the PC upon delivery, a Memory Pack
must be selected and installed in the CPU. There are two Memory Packs avail-
able, either RAM or ROM, that can be used for both the C1000H and C2000H
Systems.
Note Mount a Memory Pack to the CPU on the left and another Memory Pack to the
CPU on the right. These Memory Packs must have the same specifications.
When using the RAM Pack, there must not be any difference in write-protect
switch settings for the left and right CPUs, otherwise a collation error will result
and the PC will not operate.
Data can be randomly written to and read from the RAM Pack, making it possible
to enter your own program into the CPU. However, because this is not a fixed
program, the memory of the RAM Pack is erased when power is not supplied to
the CPU or when the RAM Pack is removed from the CPU without first being con-
nected to a backup battery.
1. When removing the RAM Pack from the CPU, be sure to connect the RAM
Pack to a backup battery before removing it from the CPU or the data will be
lost. Do not use the backup battery located in the compartment above the
Memory Unit Compartment. It is used to backup memory in the CPU.
2. Do not remove the battery in the CPU when the RAM Pack has been
removed from the CPU.
There is a write-protect switch and a write-protect indicator on the RAM Pack, as
shown in the following diagram. Setting the write-protect switch to OFF allows
data to be written to the RAM Pack. Use a peripheral device, such as a Program-
ming Console, to write to the RAM Pack.
Battery connector
To write data to the RAM Pack, move the write-protect switch to the OFF posi-
tion. After data is written to the RAM Pack, be sure to move the write-protect
switch to the ON position to protect the data from further alterations. If you try to
write data to the Memory Pack while the write-protect switch is in the ON posi-
tion, the message DISABLED ROM will appear on the Programming Console.
Four models of RAM Packs are available, which vary in memory capacity: 8K,
16K, 24K, and 32K words. Refer to Appendix C Standard Models for model num-
bers.
Write-protect LED indicator
Write-protect switch
RAM Pack
Section 2-13
OFF
ON
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