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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