Mitsubishi Electric MELSEC FX3U Programming Manual page 390

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. 32-bit operation (DSPD)
The input pulse
[ +1,
D D
[ +5,
D D
By repeating this operation, the measured value [
proportional to the rotation speed).
Command
input
FNC 56
DSPD
1) Timing chart
Command
input
S
1
[
[ S +1, S
2
2) The measured value [
N(rpm)
388
is counted only for [
S
1
], the present value is stored in [
+4] (ms).
S S
1 2
[ D +1,
Measured value
D +3, D +2]
Current value
ms
[ S +1, S ] [ S
2 2 2
Counting time Counting time
ms
]
2
[ +5, +4]
D D
Remaining time (ms)
+1,
D D
Input X000
60 [
N =
Proximity switch
"n" pulses/rotation
13 High Speed Processing – FNC 50 to FNC 59
+1, ] x 1 ms. The measured value is stored in
S S
2 2
+3,
D D
+1,
D D
D
The command contact is set to ON.
D ]
[ +3,
D
of
S
1
stored to [
Accompanied by this operation, [
reset, and then counting of the "OFF → ON" operation of
ms
+1, S ] S
is started again.
2 1
[ +5,
D
time.
] is in proportion to the number of rotations as shown below:
+1, ]
3
× 10 (r/min)
nt
t: Measurement time duration specified as [
13.7 FNC 56 – SPD / Speed Detection
+2], and the remaining time is stored in
] will store the pulse density (which is
+2] counts "OFF → ON" operation
D
. [ +1, ] ms later, the counting result is
S S
2 2
+1, ].
D
D
D
+4] is used to measure the remaining
D
+3, +2] is
D
+1, ] (ms)