In PLR logic, two switches connected in series energize the output only if what condition is met?

In PLR logic, two switches connected in series energize the output only if what condition is met?

• A. Both switches closed
• B. One of them closed
• C. Both must be open
• D. Neither is required

Answer: (A)

In PLR logic, wiring switches in series creates an AND condition: the output only energizes when there is a complete path through both switches. If both are closed, current can flow from the supply through each switch to the load, energizing the output. If either switch is open, the path is broken and energization does not occur. So, both switches must be closed for the output to energize. (If they were in parallel, energization could occur if either switch closes, which is an OR condition.)

In PLR logic, wiring switches in series creates an AND condition: the output only energizes when there is a complete path through both switches. If both are closed, current can flow from the supply through each switch to the load, energizing the output. If either switch is open, the path is broken and energization does not occur. So, both switches must be closed for the output to energize. (If they were in parallel, energization could occur if either switch closes, which is an OR condition.)