In PLR programming, two switches in series are described as which?

In PLR programming, two switches in series are described as which?

• A. S1 or S2
• B. S1 and S2
• C. S1 with S2
• D. S1 without S2

Answer: (B)

Two switches in series create a path that only closes when both switches are closed. In PLR programming this configuration is described as the AND of the two inputs (S1 and S2). The circuit requires both conditions to be true for the signal to pass; if either switch opens, the path is broken and the output won’t activate. Describing it as S1 or S2 would suggest that closing just one of them is enough, which isn’t the case for a series arrangement. Terms like with or without aren’t standard for this logic and can be misleading.

Two switches in series create a path that only closes when both switches are closed. In PLR programming this configuration is described as the AND of the two inputs (S1 and S2). The circuit requires both conditions to be true for the signal to pass; if either switch opens, the path is broken and the output won’t activate. Describing it as S1 or S2 would suggest that closing just one of them is enough, which isn’t the case for a series arrangement. Terms like with or without aren’t standard for this logic and can be misleading.