| 摘要 |
<p>To realize a power saving operation by simple handling, a PLC system includes: power-circuit control units 204, 304, and 504 that supply and stop supplying power to each terminal; input/output circuits 202, 302, and 502 that detect whether the terminals 203, 303, and 503 are in a used state; a switching unit 103 that switches an power mode between a power saving mode and a normal mode; a storage unit 102 that stores therein external-wiring state information 105 that is a detection result by the input/output circuit; and control units (a first control unit 101 and second control units 201, 301, and 501) that, when the power mode is in a normal mode, cause the power-circuit control units to supply power to all the terminals and store the detection results related to all the terminals by the input/output circuits as the external-wiring state information 105 in the storage unit 102 and, when the power mode is in a power saving mode, cause the power-circuit control units to stop supplying power to a terminal being designated as a terminal in an unused state in the external-wiring state information 105.</p> |
