Why are commissioning checks performed on a loop?

• A. Verify end-to-end operation of sensors, transmitters, controllers, and actuators before startup
• B. Calibrate only the sensor outputs
• C. Test only the controller in isolation
• D. Check only wiring continuity

Answer: (A)

The main idea is to confirm end-to-end operation of the entire control loop before startup. Commissioning checks verify that sensing elements, transmitters, the controller, and the final control element all work together as a system, with signals flowing correctly, measurements being accurate, the controller processing inputs properly, and the actuator responding as intended. By applying known test signals and observing the loop’s response, you ensure the whole chain behaves within spec, catch mismatches in calibration or scaling, validate controller gains and setpoints, and confirm safety interlocks and alarms operate. This holistic validation prevents surprises during operation. Narrowly calibrating only the sensor outputs, testing the controller in isolation, or checking wiring continuity alone would miss how the entire loop interacts and performs together.