Built-In Analog Volume [D8030 And D8031] - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
4. Cautions for communication setting devices (D8120, D8121 and D8129)
Special data registers D8120 (communication format), D8121 (station number setting) and D8129 (timeout
check time) are backed up by the battery in FX
When performing the batteryless operation in FX
procedure described above, and then transfer proper set values to them using a program.
The communication conditions can be set in the parameter settings.
When the communication conditions are set in the parameter settings, the PLC transfers the parameter
values to the above special data registers before operation. Thus it is recommended to set the
communication conditions via the parameter settings.

37.2.11 Built-in analog volume [D8030 and D8031]

Values of variable analog potentiometers built in FX
range from 0 to 255 in the following special registers in accordance with the scale position.
An obtained numeric value can be specified as the indirectly specified value for a timer to make a variable
potentiometer type analog timer.
• VR1 → D8030 (Integer from 0 to 255)
• VR2 → D8031 (Integer from 0 to 255)
[Basic example]
X003
This register stores the value
(0 to 255) of variable analog
potentiometer.
[Applied example]
M8000
RUN monitor
"D8030 (VR2) value x 2" is transferred to D0 (D1).
X003
918
T10
D8030
0 to 25.5 sec
FNC 22
D8031 K 2
MUL
(0 to 51 sec)
T10 D O
The set value range can be changed (up to 32,767)
by multiplying the register value by "n".
Do not use D1 in other programs.
37 Operation of Special Devices (M8000 -, D8000 -)
37.2 Supplement of Special Devices (M8000 - and D8000 -)
/FX PLCs.
3U 3UC
/FX PLCs, reset these special data registers using the
3U 3UC
PLCs as standard are stored as numeric data in the
3G
"D8030 (VR2) value x 2"
DO (D1)
is transferred to D0 (D1).