Systems and methods for monitoring input signal parameters are provided. One embodiment may include an input unit for receiving at least three signals. The at least three signals can comprise at least one value associated with at least one monitored parameter. The system may further include at least one controller for determining that the at least one value of the at least three signals is outside of a predetermined range of values, detecting a deviation in the at least one value associated with the at least three signals from an expected value within the predetermined range of values, determining that the deviation exceeds a predetermined period of time threshold, and determining a change in at least one of the at least three signals based at least in part on the determination that the deviation exceeds the threshold period of time.