Input module for an industrial controller

An input module for an industrial controller, comprising:

• a plurality of input terminals, each input terminal configured to receive an input signal from a remote device wherein each input signal may be in one of a first state and a second state;
• a memory device configured to store:
• a series of instructions;
• a plurality of first registers wherein each of the first registers is associated with one of the plurality of input terminals;
• and a plurality of second register, wherein each of the second registers is associated with one of the plurality of input terminals;
• a clock circuit generating a time signal;
• and
• a processor configured to receive each of the input signals and the time signal and further configured to execute the series of instructions to:
• detect a transition of each input signal from one of the first state and the second state to the other of the first state and the second state;
• read the time signal responsive to detecting each transition;
• store the time signal corresponding to the transition in one of the plurality of first registers when the input signal on the corresponding input terminal transitions from the first state to the second state;
• and
• store the time signal corresponding to the transition in one of the plurality of second registers when the input signal on the corresponding input terminal transitions from the second state to the first state.