Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 118

Transition in MELSAP-L (instruction format)
In MELSAP-L (instruction format), transitions are described in text format in a SFC diagram.
To switch from detailed expression in ladder diagrams to MELSAP-L (instruction format), select [View] 
[Switch Ladder Display]  [MELSAP-L (Instruction Format)] from the menu. ( GX Works3 Operating
Manual)
In MELSAP-L (instruction format), transitions are described using the instructions corresponding to contacts. If a Boolean
expression of a transition is TRUE, the transition becomes TRUE.
In MELSAP-L (instruction format), programs are described in the following format.
: applicable label/device
Item
Normally open contact (LD
instruction)
Normally closed contact (LDI
instruction)
Rising edge pulse (LDP
instruction)
Falling edge pulse (LDF
instruction)
Inverting the operation result
(INV instruction)
Converting the operation
result into a pulse (rising
edge) (MEP instruction)
Converting the operation
result into a pulse (falling
edge) (MEF instruction)
Converting the edge relay
operation result into a pulse
(rising edge) (EGP
instruction)
Converting the edge relay
operation result into a pulse
(falling edge) (EGF
instruction)
8 SFC PROGRAM
116
8.2 Structure
MELSAP-L (instruction format)
a
b
p
f
& INV
& MEP
& MEF
& EGP 
& EGF 
Example
aX0
bX1
pM2
fM3
aM0 & INV
aM1 & MEP
aM2 & MEF
aM3 & EGP V0
aM4 & EGF V1