Lab 02-3: Scan Execution and the OTE Instruction @🏠 $
- Due No due date
- Points 20
- Questions 4
- Time Limit None
- Allowed Attempts 3
Instructions
In this lab, you'll learn the most common piece of bad practice when programming ladder logic: Using more than one OTE connected to the same address.
To understand why this is bad practice, we need to understand more about how the PLC examines its program. The PLC scans the Ladder Logic program from Left --> Right and from Top --> Bottom. This has specific noticeable effects, as we're about to see.
You'll need two Normally Open buttons (Inputs) and one light (Output). You are welcome to decide which addresses to use. Unplug the trainer before wiring.
Local:1:I.Data.___ - Button 1 (NO)
Local:1:I.Data.___ - Button 2 (NO)
Local:1:O.Data.___ - Light
LAB 02-3 ASSIGNMENT:
1) Program the PLC as shown below. (Note that both rungs have the same output.) Download the program and put the PLC in Run Mode.
Answer the questions below.