Filter
Top Products
767
FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.1 SFC Program
31
FNC277-FNC279
Data
Transfer 3
32
FNC280-FNC289
High-Speed
Processing 2
33
FNC290-FNC299
Extension File
Register Control
34
FNC300-FNC305
FX
3U
-CF-ADP
35
SFC•STL
Programming
36
Interrupt
Function
37
Special Device
38
Error Code
A
Version Up
Information
B
Execution Times
2. Procedure using a pulse contact instruction (M2800
to M3071)
By using an auxiliary relay M2800 to M3071 in a rising/falling
edge detection instruction (LDP, LDF, ANDP, ANDF, ORP or
ORF), the ON status can be efficiently transferred by the same
signal.
When M2800 or later is specified as a device in a rising/falling
edge detection instruction, only the first rising/falling edge
detection instruction after a coil instruction is executed.
Accordingly, when X001 is set to ON, only the transfer condition
in a state relay currently in the ON status is ON during one
operation cycle, and then the ON status is transferred to the
next state relay.
*1. It is allowable to program a device number used in LD,
LDI, OR or ORI instructions after a corresponding coil in the ladder block. However, if the same device number
is programmed in a LDP, LDF, ANDP, ANDF, ORP or ORF instruction, the priority is given to such an
instruction and the transfer condition is not effective.
Caution on using a rising/falling edge detection contact
When a rising/falling detection contact in a LDP, LDF, ANDP, ANDF, ORP or ORF instruction is used in a state relay,
the contact whose status was changed while the state relay was OFF is detected when the state relay turns ON the
next time.
When it is necessary to immediately detect the rising edge or falling edge for a condition which may change while a
state relay is OFF, change the program as shown below:
When the ON status is transferred to S70 at the falling edge of X013 and then X014 turns OFF after that, the falling
edge of X014 is not detected at this point because S3 is OFF. When S3 turns ON the next time, the falling edge of
X014 is detected.
Accordingly, when S3 turns ON the next time, the ON status is immediately transferred to S70.
51
50
X001
0
2
3
TRAN
Ladder block
SFC block
(Transfer input)
M2800
M2800
M2800
1
M2800
TRAN
M2800
TRAN
M2800
*1
X013
S3
X014
SET S70
Change
X013
S3
SET S70
M7
M6
M6
M7
X014