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When the button is pushed (momentarily) the first door will start to open immediately, the second door will start to open 2 seconds later. The first door power will stay open for a total of 10 seconds, and the second door power will stay on for 14 seconds. Use a timing diagram to design the ladder logic.
2s 10s 14s
Ladder Logic:
Figure 10.5 Design With a Timing Diagram
plc design -10.9
1. DESIGN CASES
1. SUMMARY
* Timing diagrams can show how a system changes over time.
* Process sequence bits can be used to design a process that changes over time.
* Timing diagrams can be used for systems with a time driven performance.
10.6 PRACTICE PROBLEMS
1. Write ladder logic that will give the following timing diagram for B after input A is pushed. After A is pushed any changes in the state of A will be ignored.
2. Design ladder logic for the timing diagram below. When an input A becomes active the sequence should start.
1. A wrapping process is to be controlled with a PLC. The general sequence of operations is described below. Develop the ladder logic using process sequence bits.
1. The folder is idle until a part arrives.
2. When a part arrives it triggers the part sensor and the part is held in place by actuating the hold actuator.
plc design -10.10
1. The first wrap is done by turning on output paper for 1 second.
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