Antonelli, Terry, Stout & Kraus
Programmable controller and sequence control method
 A programmable controller for executing a program having mixed instructions. The programmable controller includes a bit operation memory for storing a mixed instruction inclusive of the mixture of bit operation instructions and word operation instructions in order of execution and a word operation memory for storing the word operation instructions in the mixed instruction in order of execution. A bit operation processor is provided in the programmable controller for outputting a start command for a word operation instruction when a word operation instruction read from the bit operation memory subsequently to the execution of the bit operation instruction has been recognized. The programmable controller also provides a microprocessor for receiving the word operation start command to execute the word operation instruction stored in the word operation memory, 
Hitachi, Ltd.
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Kunihiko Toshihiko Yasuo Noboru Hiromitsu Mitsuaki
Onuma Matsuda Morooka Azusawa Kikuchi Kobayashi