Mitsubishi Electric MELSEC FX3U Programming Manual page 848

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Examples of flows with selective branches and recombination
1. Example of selecting and carrying large and small balls
The figure below shows a mechanism which selects and carries large and small balls using conveyors.
The upper left position is regarded as the origin, and the mechanism performs in the order "moving down →
suction → moving up → moving rightward → moving down → release → moving up → moving leftward."
When the arm moves down and the electromagnet pushes a large ball, the lower limit switch LS2 turns OFF.
When the electromagnet pushes a small ball, LS2 turns ON.
X026
Start
Moving
rightward:
M
Y003
Moving
leftward:
Y004
Moving up:
Y002
Moving down:
Y000
846
X001
LS1 Left limit
X003
Origin
LS3 Upper
indication
limit
Y007
+
CY1 When a large ball is pushed, the piston does
not reach the lower limit and X002 does not
turn ON.
X002
LS2 Lower limit
Electromagnet
Y001
X004
LS4
Proximity
switch
Small
PS0
X000
35 SFC Program and Step Ladder
35.2 Step Ladder
X005
LS5
Large
+