Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 90

The SFC program consists of steps that represent units of operations in a series of machine operations.
In each step, the actual detailed control is programmed.
Machining operation
flowchart
Start processing
Pallet check and
clamping operation
Hole making
operation
Unclamping
operation and
workpiece unloading
End processing
An SFC program starts at an initial step, executes an action of the next step in due order every time the relevant transition
becomes TRUE, and ends a series of operations at an end step.
8 SFC PROGRAM
88
SFC diagram
1 operation unit
1 operation unit
1 operation unit
1 operation unit
1 operation unit
Ladder diagram of the action or transition of each step
Workpiece
detection
Start switch
X0 X1
Pallet detection
X2
Always ON
SM400
Clamp confirmation
X3
Always ON
SM400
Y22
PLS
M0
SET
X4
Drill down endpoint
RST
OUT
T0
SET
Drill up endpoint
X5
Always ON
SM400
Y25
PLS
M1
RST
X6
Unclamp confirmation
Workpiece unloading
X7
confirmation
Conveyer start
Y20
TRAN
Pallet clamping
Y21
TRAN
Drill rotation
Y22
M0
Drill down
Y23
Y23
T0 K20
Drill up
Y24
TRAN
Pallet unclamping
Y25
M1
Y24
Conveyer start
Y20
TRAN