BIT ARITHMETIC CONTROLLER AND PROGRAMMABLE LOGIC CONTROLLER EQUIPPED WITH SAME

PROBLEM TO BE SOLVED: To provide a bit arithmetic controller which can operates fast while maintaining modifications of a program, and a programmable logic controller (PLC) equipped with it. SOLUTION: The bit arithmetic controller 10 has a programmable logic device (PLD) 11, a means 17 which inputs an input signal to the PLD 11 during execution, and a means 18 which outputs an output signal to a controlled system 15. In the PLD, data on a circuit diagram generated by (a) compiling and converting a ladder program into an instruction list and converting the instruction list into equivalent digital circuit data in advance or (b) using constitution components of the ladder program as symbols for circuit components are expanded into digital circuit data by a digital circuit equivalent to ladder constitution components and the digital circuit data are converted into constitution data of the PLD 11 on the sop and written. Further, the PLC is equipped with this bit arithmetic controller 10.