Battery [Batt (Bat)] Led And [Alm] Led Off Command [M8030] - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition

37.2.10 Battery [BATT (BAT)] LED and [ALM] LED OFF command [M8030]

When M8030 is set to ON, the battery LED does not turn ON even if the voltage in the battery for memory
backup becomes low.
When the indication of "battery voltage low error" is not required or when the battery is removed, set M8030 to
ON.
When batteryless operation is required in FX
operation by parameter setting in peripheral equipment" below.
1. Batteryless operation by parameter setting in peripheral equipment
Specify "batteryless operation" mode in the parameter settings.
1) When the batteryless operation option is specified
When "batteryless mode" is specified, the control to turn OFF the BATT (BAT) LED and initialization of
the latch area for the devices shown below are automatically executed by the PLC system.
- Auxiliary relay (M)
- Data register (D)
2) Applicable programming tool
Some programming tool versions do not support "batteryless mode." In such versions, input a sequence
program to enable the batteryless operation as explained below.
2. Conditions for batteryless operation
1) An FLROM (optional memory cassette) for program memory is installed so that programs are not erased.
(only in FX
3U
2) The latch (battery backed) devices such as auxiliary relays and data registers are not used for control.
3) The sampling trace function is not used.
4) The real time clock function is not used. (only in FX
3. Example program for batteryless mode
When a parameter setting for "batteryless mode" is not available, create the sequence program shown below.
• Example program for clearing the memory backup area
{when the latch (battery backed) ranges in the parameter settings are set to their initial values.}
M8000
RUN monitor
M8002
Initial pulse
*1. The device number is the default number of the latch (battery backed) device range limits in the
parameter settings.
If the latch (battery backed) device numbers in the parameter settings are changed to other values,
change the device numbers here in accordance with the changed latch ranges.
- Counter (C)
- Timer (T)
/FX PLCs)
3UC
M8030 BATT(BAT) LED turns OFF.
FNC 40
M500 *1 M7679
ZRST
FNC 40
S500 *1 S4095
ZRST
FNC 40
T246 T255
ZRST
FNC 40
*1 *1
C100 C199
ZRST
FNC 40
*1 *1
C220 C255
ZRST
FNC 40
*1
D200 D7999
ZRST
FNC 40
R0 R32767
ZRST
37 Operation of Special Devices (M8000 -, D8000 -)
37.2 Supplement of Special Devices (M8000 - and D8000 -)
/FX PLCs, do not use M8030 and refer to "1. Batteryless
3U 3UC
- State relay (S)
- Extension register (R)
/FX PLCs)
3U 3UC
M8000
or
RUN monitor
M8002
Auxiliary relay
Initial pulse
State relay
Timer
16 bit counter
32 bit counter
Data register
M8030 BATT(BAT) LED
turns OFF.
M8032 The latch areas
are cleared.
917
31
32
33
34
35
36
37
38
A
B