Question

A PLC controls five sets of stage lights for an auditorium. For one particular stage production, the various acts and scenes require six different lighting sequences, each involving a different combination of the five light sets. The stagehand in charge of lighting has a control panel that controls the PLC. There are two switches on the panel: STEP a momentary N/O pushbutton switch that makes the PLC step to the next lighting sequence. a maintained switch that makes the sequence advance when ON and reverse when OFF (reverse is used for repeating sequences during rehearsal). UPDN The lighting sequence required is shown in Figure 4-34. For this problem, there will be two PLC inputs, STEP and UPDN, and five PLC outputs, LIGHTSI through LIGHTS5. For the purpose of special effects, LIGHTS5 should flash continuously for 0.3 second ON and 0.3 second OFF when activated All the lights should operate in the sequence shown in the table and should sequence both forward and reverse. The sequencer should be circular (i.e., when sequencing forward, step 0 follows step 6, and when sequencing in reverse, step 6 follows step 0). Step 0 Step 1 Step 2 Step 3 | Step 4 | Step 5 Step 6 LIGHTS1 LIGHTS2 LIGHTS3 LIGHTS4 LIGHTS5 Flash Flash Flash Flash • 1. n 11.

Please show in PLC programming or draw out ladder rungs

Answer 1

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