KANSHISEIGYOSOCHI

摘要

PURPOSE:To reduce overall power consumption by controlling the ON/OFF operation of plural relay output sections with a DC output via an output interface circuit and collecting the ON/OFF information of plural contact input sections as a digital monitor signal via an input interface circuit. CONSTITUTION:With a DC voltage VDC from an input output selector circuit 7 applied to a relay output section 12, the output side of a photocoupler of an output interface circuit 9 is conductive, a closed circuit is formed with respect to the DC voltage VDC to active a relay R of a relay output section 12. In this case, a reverse flow preventing diode 13 inhibit current flowing to other relay output sections. Thus, a desired relay of NXn sets of relay output sections 12 is operated to apply the ON/OFF control of a device to be controlled and the ON/OFF state (state of contact input) of the contact by the control is confirmed by a monitor input of a contact input section 11. Thus, the number of interface circuits and signal lines is decreased and power consumption is saved.