Battery [Batt (Bat)] Led Off Command [M8030] - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]

4.2.10 Battery [BATT (BAT)] LED OFF command [M8030]

1. Batteryless operation
While M8030 remains ON, the battery LED does not turn ON even if the voltage of the battery used for
memory backup becomes low.
FX /FX /FX
0S 0 0N
Set M8030 to ON when indication of the low battery voltage error is not required or when the battery is
removed.
When the batteryless operation is required, however, do not use M8030 but refer to "2. Parameter setting in
peripheral equipment" below.
2. Parameter setting in peripheral equipment
Specify the "batteryless operation" mode in the parameter setting.
FX /FX /FX
0S 0 0N
operation mode.
1) When the batteryless operation mode is specified
The PLC system automatically controls turning OFF of the battery LED and initializes devices in the
latched area shown below.
- Auxiliary relay (M)
- Data register (D)
2) When the parameter setting for the batteryless operation mode is not available, input a sequence
program for the batteryless operation mode described below.
3. Conditions to enable the batteryless operation mode
1) An FLROM, EEPROM or EPROM for program memory is attached so that programs will not be lost.
2) Lathed (backed-up) type 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.
228
/FX /FX /FX /FX
1S 1N 1NC 3S
/FX /FX /FX /FX /FX
1S 1N 1NC U
- Counter (C)
- Timer (T)
4 Operations of Special Devices (M8000 and later, D8000 and later)
4.2 Supplement of Special Devices (M8000 and later and D8000 and later)
PLCs do not support M8030.
/FX /FX /FX PLCs do not support the batteryless
2C 3S 3G 3GC
- State relay (S)
- Extension register (R)