Programmable controller

A programmable controller that carries out a pipeline processing of sequence programs, comprising:

• at least a first storage unit and a second storage unit which store sequence programs, device information used for a sequence processing and task information of a microprocessor;
• a pipeline register that sequentially reads and latches the sequence programs from the first storage unit;
• a selecting unit that selects whether the device information is to be read/written from/to the first storage unit or the second storage unit based on the sequence programs;
• and
• a control unit that controls to interrupt the pipeline processing during the reading/writing of the device information, prohibits the reading of the sequence program until the completion of the reading/writing of the device information when a sequence program to be read/written from/to the first storage unit has been input, and controls to carry out the reading/writing of the device information and the reading of a sequence program simultaneously when a sequence program to be read/written from/to the second storage unit has been input.