Controlling a subsea blowout preventer stack

A subsea well control system comprising:

• a plurality of sensors coupled to a subsea blowout preventer stack and a subsea blowout preventer control system, the subsea blowout preventer control system operatively coupled to the subsea blowout preventer stack, the plurality of sensors configured to:
• sense a condition of the subsea blowout preventer stack and the subsea blowout preventer control system, the condition comprising at least one of a temperature, a pressure, a fluid type of a fluid in the subsea blowout preventer stack, a specific gravity of the fluid, a flow rate of the fluid, a presence of a tool joint of a work string, a location of a plurality of annular preventers, a location of a plurality of rams, a position of the plurality of annular preventers, a position of the plurality of rams, a wear measurement of the plurality of annular preventers, a wear measurement of the plurality of rams, a closure blockage of at least one of the plurality of annular preventers or the plurality of rams, or a pressure of the subsea blowout preventer control system;
• and
• transmit a signal representing a value of the condition;
• and
• a well control programmable logic controller operatively coupled to the subsea blowout preventer control system, the well control programmable logic controller configured to perform operations comprising:
• receiving the signal from the plurality of sensors;
• comparing the value to a preset value;
• and
• in response to the value greater than or equal to the preset value, transmitting a command signal to the subsea blowout preventer control system to seal, by at least one of the plurality of annular preventers and the plurality of rams of the subsea blowout preventer stack, a fluid flow through the subsea blowout preventer stack.