Mitsubishi Electronics FX3GC ユーザーズマニュアル

373

/FX

3GC

/FX

3UC

Series

Programming Manual - Basic & Applied Instruction Edition

13 High-Speed Processing – FNC 50 to FNC 59

13.7 FNC 56 – SPD / Speed Detection

FN
C30
-FN
C3

ota

tion and

Shi
ft

FN
C40-FN

C49

ata O
perati

FNC

50-FNC

High-Speed

Proc

essing

FM
C60-FN

C69

andy

struction

FN
C70-FN

C79

xternal

I/O

vice

FNC

80-FNC

External

Dev
ice

FNC1
00-
FNC10

Dat
a

Transfer 2

FNC1

10-
FNC139

oati

ng Poi

FNC14

0-F

149

Operation 2

FNC1

50-
FNC159

Pos
itioning

Control

2. 32-bit operation (DSPD)

The input pulse

is counted only for [

+1,

] x 1 ms. The measured value is stored in [

+1,

], the present value is stored in [

+3,

+2], and the remaining time is stored in [

+5,

+4]

(ms).
By repeating this operation, the measured value [

+1,

] will store the pulse density (which is proportional to

the rotation speed).

1) Timing chart

2) The measured value [

+1,

] is in proportion to the number of rotations as shown below:

FNC 56

DSPD

Command

input

Command

input

Measured value

Current value

Remaining time (ms)

The command contact is set to ON.

[ +3, +2] counts "OFF

→ ON" operation

of   . [     +1,   ] ms later, the counting result is
stored to [    +1,   ].
Accompanied by this operation, [ +3,    +2] is
reset, and then counting of the "OFF

→ ON" operation of

is started again.

[ +5, +4] is used to measure the remaining
time.

Counting time

[ +1, ]

[ +3, +2]

[ +1, ]

[ +5, +4]

Counting time

N (rpm)

Input X000

Proximity switch
"n" pulses/rotation

60 [ +1, ]

t: Measurement time duration specified as [ +1, ] (ms)

N =

×10

(r/min)