1. A programmable sequence controller comprising: memory means for memorizing a sequence program comprising a train of instructions identified respectively by memory addresses thereof, each of said instructions having an examine command and an address information therein; an input module operatively connected to a plurality of addressed external input devices for converting states of said external input devices into logical values; an output module operatively connected to a plurality of addressed external output devices to be energized or deenergized; a logic operation circuit operatively connected to said memory means and to said input and output modules; reading means for reading out and feeding said train of instructions from said memory means to said logic operation circuit; said logic operation circuit comprising: circuit means for examining a logical value of one of said external input devices specified by the address information of one of said instructions with one examine command of said one of said instructions read out by said reading means; second memory means for temporarily memorizing an examined result of said circuit means; said output module being operable to energize or deenergize one of said addressed external output devices in response to an output of said second memory means; and discontinuance means operatively connected to said second memory means for causing said circuit means to discontinue a next examination of a logical value of another of said external input devices specified by the address information of another of said instructions with another examine command of said another of said instructions read out by said reading means to execute a logic operation non-sequentially when said second memory means memorizes satisfaction of the preceding examination of the logical value of said one of said external input devices with said one examine command of a logical OR function or unsatisfaction of the preceding examination of the logical value of said one of said external input devices with said one examine command of a logical AND function.