Hitachi S10mini D, Hardware Manual

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8 EXPLANATION OF OPERATION
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8.8 Memory Backup
The user program is stored in the RAM (Random Access Memory) and backed up by lithium
battery at a power outage. Replace the lithium battery before it is over backup guaranteed
time. When the power is turned off while the battery is run down or the battery voltage
becomes low, the contents in the backup memory may be damaged. The backup guaranteed
time varies depending on the CPU module REV and memory capacity (see the following table).
CPU module REV and backup guaranteed time
Total memory capacity (CPU internal extended memory)
CPU Module Model
Module
REV
No memory 1 MB 2 MB 3 MB 4 MB
LQP000 (No internal memory) [A] to [C]
62,000 h
(7 years)
LQP010 (Internal memory 1 MB) [A] to [C]
LQP011 (Internal memory 1 MB) [A] to [D]
49,000 h
(5.5 years)
LQP120 (Internal memory 2 MB) [A]
40,000 h
(4.5 years)
35,000 h
(4 years) 31,000 h
(3.5 years)
LQP000 (No internal memory) [D] to [E]
31,000 h
(3.5 years)
LQP010 (Internal memory 1 MB) [D] to [E]
LQP011 (Internal memory 1 MB) [E] to [F]
30,000 h
(3.4 years)
LQP120 (Internal memory 2 MB) [B] to [C]
29,000 h
(3.3 years)
28,000 h
(3.1 years)
27,000 h
(3 years)
LQP000 (No internal memory) [F]
22,000 h
(2.5 years)
LQP010 (Internal memory 1 MB) [F]
LQP011 (Internal memory 1 MB) [G]
21,000 h
(2.3 years)
LQP120 (Internal memory 2 MB) [D]
20,000 h
(2.2 years)
19,000 h
(2.1 years)
18,000 h
(2 years)
LQP000 (No internal memory) [G] or later
13,500 h
(1.5 years)
LQP010 (Internal memory 1 MB) [G] or later
LQP011 (Internal memory 1 MB) [H] or later
13,500 h
(1.5 years)
LQP120 (Internal memory 2 MB) [E] or later
13,500 h
(1.5 years)
13,500 h
(1.5 years)
13,500 h
(1.5 years)
The total memory capacity listed above corresponds to the extended memory module and the
CPU module in combination as shown below.
No memory: LQP000
1 MB
: LQM000 × 1 board, LQP010, LQP011
2 MB : LQM000 × 2 boards
: LQM000 × 1 board, LQM000 × 1 board, LQP120
3 MB : LQM000 × 3 boards
: LQM000 × 2 boards, LQM000 × 2 boards
: LQM000 × 1 board
4 MB : LQM000 × 4 boards
: LQM000 × 3 boards, LQM000 × 3 boards
: LQM000 × 2 boards