Справочник Пользователя для Mitsubishi Electronics FX2N
FX Series Programmable Controllers
Basic Program Instructions 2
2-20
2.17
Leading and Trailing Pulse
Program example:
Basic points to remember:
-
When a PLS instruction is
executed, object devices Y
a n d M o p e r a t e f o r o n e
operation cycle after the drive
input signal has turned ON.
executed, object devices Y
a n d M o p e r a t e f o r o n e
operation cycle after the drive
input signal has turned ON.
-
When a PLF instruction is
executed, object devices Y
a n d M o p e r a t e f o r o n e
operation cycle after the drive
input signal has turned OFF.
executed, object devices Y
a n d M o p e r a t e f o r o n e
operation cycle after the drive
input signal has turned OFF.
-
When the PLC status is
changed from RUN to STOP and back to RUN with the input signals still ON, PLS M0 is
operated again. However, if an M coil which is battery backed (latched) was used instead
of M0 it would not re-activate. For the battery backed device to be re-pulsed, its driving
input (ex. X0) must be switched OFF during the RUN/STOP/RUN sequence before it will
be pulsed once more.
changed from RUN to STOP and back to RUN with the input signals still ON, PLS M0 is
operated again. However, if an M coil which is battery backed (latched) was used instead
of M0 it would not re-activate. For the battery backed device to be re-pulsed, its driving
input (ex. X0) must be switched OFF during the RUN/STOP/RUN sequence before it will
be pulsed once more.
Mnemonic
Function
Format
Devices
Program steps
PLS
(PuLSe)
(PuLSe)
Rising edge
pulse
pulse
Y, M
(no special M
coils allowed)
(no special M
coils allowed)
2
PLF
(PuLse Falling)
(PuLse Falling)
Falling / trailing
edge pulse
edge pulse
Y, M
(no special M
coils allowed)
(no special M
coils allowed)
2
FX
0(S)
FX
0N
FX FX
(2C)
FX
2N(C)
PLS
PLF
X0
PLS
M0
M0
SET
Y0
X1
PLF
M1
M1
RST
Y0
0
0
0
0
1
1
1
0
1
1
1
0
LD
PLS
LD
SET
LD
PLS
LD
SET
LD
RST
PLF
LD
LD
0
1
1
4
5
5
8
9
9
6
3
0
X
M
M
M
M
Y
M
Y
M
Y
X
Y
X
X0
X1
M0
M1
Y0
t msec