Automating manufacturing systems with PLCs

Automating Manufacturing Systems with PLCs by Hugh Jack
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Jack, Hugh. Grand Valley State University. Advanced Manufacturing Technologies -- General manufacturing. An elevator is a car that travels between floors, stopping at precise heights. There are certain logical constraints used for safety and convenience.

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The points below emphasize different types of control problems in the elevator. If the desired position changes to a new value, accelerate quickly towards the new position. Logical and sequential control is preferred for system design.

These systems are more stable, and often lower cost. Most continuous systems can be controlled logically. But, some times we will encounter a system that must be controlled continuously.

When this occurs the control system design becomes more demanding. When improperly controlled, continuous systems may be unstable and become dangerous. NOTE: all systems are continuous but they can be treated as logical for simplicity. This is the preferred starting point for simplicity, and a common approximation for real world problems. A car can be driving around a track and can pass same the same spot at a constant velocity.

But, the longer the car runs, the mass decreases, and it travels faster, but requires less gas, etc. Basically, the math gets.

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We are driving the perfect car with no friction, with no drag, and can predict how it will work perfectly. This is how the world works and the mathematics become much more complex.

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plc wiring - PREFACE. Designing software for control systems is difficult. Experienced controls engineers have learned many techniques. Automating Manufacturing Systems with PLCs - by (Hugh Jack). Ahmed M. Karim . page 0 FS = first scan T1 = ST2 ⋅ A A ST1 C*B ST3 T2 = ST1 ⋅ B T1 T3 = ST3.

The difference between these control systems can be emphasized by considering a simple elevator. An elevator is a car that travels between floors, stopping at precise heights. There are certain logical constraints used for safety and convenience. The points below emphasize different types of control problems in the elevator.

Automated Manufacturing Systems; PLCs - Lab Guide

The elevator must move towards a floor when a button is pushed. The elevator must open a door when it is at a floor. It must have the door closed before it moves. If the desired position changes to a new value, accelerate quickly towards the new position. As the elevator approaches the correct position, slow down.

Automated Manufacturing Systems with PLCs

Decelerate as you approach the final position. Allow faster motion while moving. Compensate for cable stretch, and changing spring constant, etc. Logical and sequential control is preferred for system design.