A pick and Place machine is being used to perform the following sequence when the "Start" pushbutton is pressed: Extend the arm When the arm is fully extended, close the grip and grab a box When the grip is fully closed, retract the arm When the arm has completely returned, open the grip (and drop the box) The arm is extended (out) by energizing a solenoid valve; when the valve is de-energizes, the arm retracts (in). In the same way, a second valve closes the grip (when energized) or opens the grip (when de-energized). Four proximity sensors monitor the machine's status. One sensor turns on when the arm is fully retracted, another when the arm is fully extended (towards the box). Another pair of sensors indicates whether the grip is fully open or fully closed. Here's a diagram of this "machine": Imagine that the "Prx_Grip Closed" sensor got a bit too close to the action during the night shift. The grip closed and the mechanism smashed into the proximity sensor. It's broken. Smashed. Shorted out. Now, the sensor never turns off. First thing in the morning you're called to the machine. You press the Start button. What would happen?
A pick and Place machine is being used to perform the following sequence when the "Start" pushbutton is pressed:
- Extend the arm
- When the arm is fully extended, close the grip and grab a box
- When the grip is fully closed, retract the arm
- When the arm has completely returned, open the grip (and drop the box)
The arm is extended (out) by energizing a solenoid valve; when the valve is de-energizes, the arm retracts (in). In the same way, a second valve closes the grip (when energized) or opens the grip (when de-energized). Four proximity sensors monitor the machine's status. One sensor turns on when the arm is fully retracted, another when the arm is fully extended (towards the box). Another pair of sensors indicates whether the grip is fully open or fully closed.
Here's a diagram of this "machine":
Imagine that the "Prx_Grip Closed" sensor got a bit too close to the action during the night shift. The grip closed and the mechanism smashed into the proximity sensor. It's broken. Smashed. Shorted out. Now, the sensor never turns off.
First thing in the morning you're called to the machine. You press the Start button. What would happen?
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