Abstract: Programmable sequencer apparatus for enabling an operator to selectively establish sequential energizing patterns for a plurality of outputs and thereafter for causing said plurality of outputs to be selectively energized in the sequences defined is set forth in accordance with the teachings of the present invention. According to a preferred embodiment, programmable sequencer apparatus is provided for controlling the selective energization of a plurality of outputs under conditions where any of the plurality of outputs may be selectively energized as a step of a sequence, a group of steps may be established in a sequence to define a programmed operating formula for equipment to be controlled and a plurality of operating formulas may be established to accommodate various modes of operation.