| 摘要 |
PROBLEM TO BE SOLVED: To readily utilize a special-purpose integrated circuit element for multiple purposes of extending the range of applications to reduce the manufacturing cost, in a programmable controller equipped with a special unit. SOLUTION: A special unit 130 connected to a microprocessor for performing input/output control through a bus includes an integrated circuit element 10 having a logic circuit unit 1000n (n=0 to 7), whose operation specifications are determined by a parameter memory. The logic circuit unit 1000n includes a reversible counter used for both high-speed input processing and high-speed output processing as a main component, and is connected to input/output interface circuits 139X and 139Y through a first port 11 and a second port 12. Since the function of the logic circuit unit 1000n is determined by the content of a special instruction in a sequential program, the logic circuit unit 1000n can be commonly used for various types of input/output interface circuits to allow the integrated circuit element to be used for multiple purposes. COPYRIGHT: (C)2009,JPO&INPIT
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