Mitsubishi Electric FX3G SERIES Programming Manual page 375

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. 32-bit operation (DSPD)
The input pulse
D ], the present value is stored in [
(ms).
By repeating this operation, the measured value [
the rotation speed).
Command
input
FNC 56
DSPD
1) Timing chart
Command
input
S
1
[ D
Current value
[ +1,
S S
2 2
2) The measured value [
N(rpm)
S is counted only for [ S
1
D +3,
S S D
1 2
[ D +1, D
Measured value
+3, D +2]
ms
[ +1, ] [ +1,
S S S
2 2 2
Counting time Counting time
] ms
[ D +5, D +4]
Remaining time (ms)
D +1, D ] is in proportion to the number of rotations as shown below:
Input X000
60 [
N =
Proximity switch
"n" pulses/rotation
13 High-Speed Processing – FNC 50 to FNC 59
+1, S ] x 1 ms. The measured value is stored in [
2 2
D +2], and the remaining time is stored in [
+1, ] will store the pulse density (which is proportional to
D D
The command contact is set to ON.
]
[ +3,
D D
of . [
S
S
1
2
stored to [
D
Accompanied by this operation, [
reset, and then counting of the "OFF → ON" operation of
ms
] S
S is started again.
2 1
[ +5,
D D
time.
+1, ]
× 10 (r/min) 3
nt
t: Measurement time duration specified as [
13.7 FNC 56 – SPD / Speed Detection
D +5,
+2] counts "OFF → ON" operation
+1, ] ms later, the counting result is
S
2
+1, ].
D
+3,
D D
+4] is used to measure the remaining
+1,
11
D +1,
D +4]
12
13
14
+2] is
15
16
17
18
] (ms)
19
20
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