Hakko Electronics Monitouch V Series, Reference Manual

Page: 600 / 746

Chapter 24 SRAM
24-1
24
Ou
tli
n
e
Outline
Depending on the type of V series, you can use a SRAM cassette (model:
V7EM-S, V6EM/RS, V6EM/RSi Capacity: 512 kB). Even if you do not use a
SRAM cassette, the V7 has 64 kB of capacity while the V609E30M has 8 kB of
capacity as built-in SRAM. This SRAM allows you to use the following backup
functions:
•
Memory Card Emulation Area
You can use this area as an external memory device (memory manager
function) for a PLC or for sampling data backup (data logging function).
•
Internal Memory Backup
When the V series is turned off, all data in the internal memory ($u) is
cleared (set to [0]). You can keep the non-volatile (= can retain data) internal
memory ($L/$LD) area in SRAM to retain data even when a power failure
occurs.
•
Saving the Memo Pad
If you use the memo pad function, data on the memo pad is lost when the V
series is turned off. Therefore, the V series allows you to back up data on
the memo pad into SRAM.
SRAM
POWER
F1
F2
F3
F4
F5
F6
F7
SYSTEM
For more information on the types in which you can use a SRAM cassette or built-in
SRAM, refer to page 24-2.
RUN
STOP
PLC
F1
F2
F3
F4
F5
F6
F7
SYSTEM
POWER
Trend sampling
Even when a power
failure occurs, data
in SRAM remains.
V series
Power
SRAM Cassette or Built-in SRAM
Memory Card Emulation Area
Storage Area for Memo Pad
Non-volatile Memory Area
Unless you install the battery, you cannot use the backup function when the
power is OFF.
By installing the battery, in the V7 series, V609E30M, and V608CH, you can use the
clock function as well as the backup function mentioned above (Note that in the
V608CH, you can use only the clock function). For more information, refer to “Chapter
11 Time Display/Calendar.”