Safety switch and associated methods

A system comprising:

• a cable pull switch configured to couple to a first end of a pull cable;
• and
• a pull cable excitation module in communication with the cable pull switch and configured to:
• couple to a second end of the pull cable;
• and
• enter a pull cable excitation state by varying a tension exerted on the second end of the pull cable;
• wherein the cable pull switch is further configured to:
• communicate with the pull cable excitation module to initiate the pull cable excitation state;
• detect at the first end of the pull cable the varying tension exerted on the second end of the pull cable during the pull cable excitation state;
• determine that the detected varying tension fails to meet a predefined amplitude and
• generate an output signal indicative of a pull cable failure.

A method for a cable pull system having a sensor coupled to a first end of a pull cable, the method comprising:

• entering a pull cable excitation state by varying a tension exerted on a second end of the pull cable;
• attempting to detect, via the sensor, the varying tension exerted on the second end of the pull cable during the pull cable excitation state;
• and
• generating an output signal indicative of a pull cable failure in response to failing to detect the varying tension during the pull cable excitation state.