PLC Ladder diagram programming Exercise modified version

PLC Ladder diagram Programming exercise

• Traffic light Control

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Update: Ladder diagram in the introduction of auxiliary relays, the lamp does not light the problem has been resolved, and I also found that the original ladder diagram can not achieve the counter power-off reset, and the original ladder to test the convenience of not strictly in accordance with the practice requirements set timing time, the new version of the ladder to make improvements.

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When the SW2 is off, it is easy to turn the traffic lights on and off, but when the SW2 is turned on (ie into the night mode), the red and green lights are not lit when the simulation is added.

I guess the reason is that the ladder control of the one by one corresponding principle in the night mode to join the ladder after the problem, I did not find out the specific problem, did not think of a better solution, the simulation failed ladder diagram put on, hoping to get help and advice.

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• Conveyor belt Control

  The conveyor belt part has no big problem, the time required to supply the workpiece is unknown, in order to ensure that the previous workpiece can be smooth from the left side, the time to supply the workpiece set to 10.

PLC Ladder diagram programming Exercise modified version