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5-2SectionEntering the Program
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Explanation of Operations Initially, the lift is on the first floor (where the kitchen is located) and LS1 is ON.
The door is open and LS12 is ON. L1 is ON, and the first-floor indicator light is on.
When food is placed on the lift and the “up” button is pressed to turn ON PB1,
MC11 turns ON and the door closes. After the door has closed, LS11 turns ON.
MC1 turns ON and the lift begins to go up. L1 turns OFF and the first floor indica-
tor light turns off.
When the lift reaches the second floor (the customer serving area), L2 turns ON,
MC1 turns OFF and the lift stops. L2 turns ON and the second-floor indicator
light turns on. MC22 turns ON and the second-floor door opens.
When the food is taken from the lift and the “down” button is pressed, PB2 turns
ON. MC21 turns ON and the door closes. After the door has closed, LS21 turns
ON. MC2 turns ON and the lift begins to go down. L2 turns OFF and the second-
floor indicator light turns off.
When the lift reaches the first floor again, LS1 turns ON. MC2 turns OFF and the
lift stops. L1 turns ON and the first-floor indicator light turns ON. MC12 turns ON
and the door opens.
Sequence Program Diagram
X1
LS22PB1
X1
MC11
X1
1F closed
LS11 MC12
MC1
X1
Down
LS2 MC2
L2
2F indicator light
LS11
LS2
MC22
X1
2F open
MC21LS2
X2
LS12PB2
X2
MC21
X2
2F closed
LS21 MC22
MC2
X2
Up
LS1 MC1
L1
1F indicator light
LS21
LS1
MC12
X2
1F open
MC11LS1