Mitsubishi Electric FX3G SERIES Programming Manual page 97

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. Retentive type
X001
T250
T250
Y001
X002
t1 t2
X001
Current
value
Y001
X002
3. Potentiometer type
1) When variable analog potentiometers built in the FX
[Basic example]
X003
This register stores the
value (0 to 255) of variable
analog potentiometer.
[Applied example]
M8000
FNC 22
MUL
RUN monitor
"D8030 (VR2) value x 2" is transferred to D0 (D1).
X003
2) When variable analog potentiometers (expansion board) are used
X000
X001
The analog value of the potentiometer No. 0 is converted into
binary 8-bit data, and a numeric value ranging from 0 to 255
is transferred to D0.
In this application example, the value of D0 is used as the set
value of a timer.
Set value
(constant)
K345
A data register
can be
specified also.
RST T250
Retentive time
t1 + t2 = 34.5 sec
Set value
T10 D08030
0 to 25.5 sec
D8031 K 2 DO (D1)
(0 to 51 sec)
T10
D 0
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.
volume Read
number
destination
FNC 85
K0 D0
VRRD
D0
T0
Example of application as analog timer
When the drive input X001 of the timer coil T250 turns ON, the current
value counter for T250 adds and counts clock pulses of 100 ms.
When the counted value becomes equivalent to the set value K345,
the output contact of the timer turns on.
Even if the drive input X001 turns OFF or the power is turned off
during counting, the timer continues counting when the operation
restarts. The retentive operating time is 34.5 seconds.
When the reset input X002 turns ON, the timer is reset and the output
contact is returned.
main unit are used
3G
Values of variable analog potentiometers built
in FX
numeric data ranging 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)
The value of a variable analog potentiometer board
which can be built in an FX
LT(-2) PLC as an expansion board can be obtained
as numeric data ranging from 0 to 255 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.
Use the FNC85 (VRRD) instruction to take the
value of a variable analog potentiometer into the
PLC.
→ For FNC85(VRRD), refer to Section 16.6.
Use the FNC86 (VRSC) instruction to take the value
of a variable analog potentiometer as a numeric
value ranging from 0 to 10.
→ For FNC86(VRSC), refer to Section 16.7.
4 Devices in Detail
4.5 Timer [T]
PLCs as standard are stored as
3G
FX FX
3G/ 3U/ 3UC
1
2
3
4
5
6
7
-32MT-
8
9
10
95