PURPOSE: To provide a programmable controller (PC) which can operate at higher speed against branching/confluence and control a wider sequence.

CONSTITUTION: In analysis by PC10 in selective branching or confluence, if a translating origin step is inactive, ARG16 is fixed to OFF through NRG17 and the failure of a translation condition is informed to the succeeding process, on the other hand, if it is active, the ARG16 is fixed to ON and the realization possibility of the translation condition is informed to the succeeding process. The ON/OFF data as for translation is received into the ARG16 when the translation condition can be realized. The address of the translating origin step is stored in SADD18, and at realization of the translation condition, a translating destination step is activated and simultaneously the translating origin step of the address is deactivated. In parallel branching or parallel confluence, two kinds of processes, namely, detection of the translation condition and activation or deactivation of the step, are performed in time series by the same command, and this alternative flag is set on RPT, and the address of the command to be repeated is stored in PCMEM19.