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App. - 29
Appendix 4.20 Carriage line control
The following is an example of a sequence control using a carriage to convey works
(materials).
Series of operations performed in one cycle is as follows; A work is set on the
carriage, the carriage moves forward, the carriage stops at the forward limit, the arm
pushes the work to the other conveyor side, and the carriage moves back to the
backward limit.
Carriage moves
forward (Y71)
Push (Y73)
LS open complete (X4)
Push back
(Y74)
LS forward
limit (X2)
Operating panel
Operation
indicator (Y70)
Start button (X0)
Carriage moves
back (Y72)
Carriage
LS backward
limit (X3)
Container for work
LS work present (X1)
Start button
Switch (LS work present)
Switch (LS forward limit)
Switch (LS backward limit)
Switch (LS open complete)
X0
X1
X2
X3
X4
Input
Y70
Y71
Y72
Y73
Y74
Output
MELSEC-Q
M
M
Operation indicator
Carriage moves forward
Carriage moves back
Push
Push back