Mitsubishi Electric MELSEC iQ-F Series - Page 107

8 SFC PROGRAM
8.5 SFC Program Execution Order
105
8
• With continuous transition
• With continuous transition (operation compatible with FX3)
Scan Description
Scan 1 Steps (1) to (4) are continuously activated.
When each step is activated, the actions (A) to (C) are executed in the contact OFF status after the execution in the contact ON
status, and the action (D) is executed in the contact ON status. However, in the case of coil HOLD step the action is not executed in
the contact OFF status.
Scan 2 and after Step (4) is active until the transition (d) becomes TRUE, and the action (D) is executed in the contact ON status.
Scan Description
Scan 1 Steps (1) to (4) are continuously activated.
When each step is activated, the actions (A) to (D) are executed in the contact ON status.
Scan 2 The actions (A) to (C) are executed in the contact OFF status, and the action (D) is executed in the contact ON status. However, in
the case of coil HOLD step the action is not executed in the contact OFF status.
Scan 3 and after Step (4) is active until the transition (d) becomes TRUE, and the action (D) is executed in the contact ON status.
(A)(1)
(B)(2)
(C)(3)
(D)(4)
(d)
(c)
(a)
(b)
Scan 1
(1) Active
(A)
Execution in the
contact ON status
(A) Execution in the
contact OFF status
(a) TRUE
Scan 2
(2) Active
(B)
Execution in the
contact ON status
(B) Execution in the
contact OFF status
(b) TRUE
(3) Active
(C)
Execution in the
contact ON status
(C) Execution in the
contact OFF status
(c) TRUE
(4) Active
(D) Execution in the
contact ON status
(d) FALSE
End processing
(4) Active
(D) Execution in the
contact ON status
(d) FALSE
End processing
(A)(1)
(B)(2)
(C)(3)
(D)(4)
(d)
(c)
(a)
(b)
Scan 1
(1) Active
(A) Execution in the
contact ON status
(a) TRUE
(2) Active
(B) Execution in the
contact ON status
(b) TRUE
(3) Active
(C) Execution in the
contact ON status
(c) TRUE
(4) Active
(D) Execution in the
contact ON status
(d) FALSE
End processing
Scan 3
(4) Active
(D) Execution in the
contact ON status
(d) FALSE
End processing
Scan 2
(4) Active
(D) Execution in the
contact ON status
(d) FALSE
End processing
(A) Execution in the
contact OFF
status
(B) Execution in the
contact OFF
status
(C) Execution in the
contact OFF
status