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Settling time refers to the time required for a signal to reach a steady state after sending an actuation command to the relay. Steady state is determined by the required accuracy of the measurement. Highly accurate measurements require longer settling times than less accurate measurements.
Settling time is an important consideration for solid-state relays with high path resistance and R-C time constants.
Some switch modules apply settling time only when relays are closed, not when relays are open.
For certain situations you may need to increase the default settling time. Refer to Adding Additional Settling Time for more information about increasing the default settling time. Refer to the Checking the Settling Time section of the Adding Additional Settling Time topic for more information about checking the default settling time of a switch.