Mitsubishi Electric MELSEC FX3U - Page 817

815
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.1 SFC Program
31
FNC275-FNC279 Data Transfer 3
32
FNC280-FNC289 High Speed Processing 2
33
FNC290-FNC299 Extension File Register
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
Caution on using a rising/falling edge detection contact
When a rising/falling detection contact in 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.
X013
S3
X014
SET S70
Change
X013
S3
SET S70
M7
M6
M6
M7
X014