Patent ID: 6393329
Filing Date: 2002-05-21
Classification: G06F

Abstract:
A programmable controller system comprising:a base board having a plurality of slots; a power supply unit connected to at least one of the slots for supplying power to the base board; at least one I/O unit connected to any of the remaining slots for executing I/O processing; a control signal terminal on the base board, which receives an I/O unit specification signal identifying a selected I/O unit; discrimination means for recognizing the number of slots that the at least one I/O unit is shifted based on the quantity of slots occupied by the power supply unit; correction means for correcting the I/O unit specification signal based on number of slots that the at least one I/O unit is shifted as recognized by the discrimination means; and selection means for selecting one actual slot in which the I/O unit specified by the I/O unit specification signal is attached based on the corrected I/O specification signal.