I am currently using Allen Bradley PLC and RSLogix Micro to program it. The problem is:
Create a ladder logic diagram for the following problem in which pump #1 and pump #2, alternately or simultaneously, pump liquid.
• When the level switch closes, first pump #1 turns on. If pump #1 runs more than 30 seconds, then pump #2 turns on. Both pumps continue operating until the level switch opens, indicating a lower liquid level.
• When the level switch closes again, pump #2 turns on. Note that either pump #1 or pump #2 will turn on first to discharge the liquid. Similarly, if pump #2 runs more than 30 seconds, then pump #1 turns on. Both pumps continue operating until the level switch opens, indicating a lower liquid level. Therefore, either pump #1 or pump #2 discharges the liquid, or both pumps discharge the liquid.
Use the force function to close and open the level switch and turn the pumps on accordingly to discharge the liquid level.
Use the force function to turn off (i.e., disable) one of the pumps. Now, run the program and examine if it is working properly.
The updated solution:
The question is that I am not sure if I understand the alternating process between the two pumps.
3rd attempt: The first part of the problem.
4th attempt: So I tried to insert the "flip-flop". And I understand that XOR command is used to alternatively change the value of the B3:0/1. However, when I tried to put in RS Logix the program that you provided, I could not write the address B:3.0/1. Because, it said that address should be specified to the word level. And also the BSR command is represented different in RS Logix. Is represented as in the picture below: