Patent ID: 8644179

Claim:
A control system, comprising: switch devices that operate on supplied power, each of the switch devices including multiple switch-side ports and a communication processing unit for relaying data input to any of the switch-side ports on a basis of destination information set for the data; a relay device that includes first ports coupled with corresponding switch-side ports of the switch devices and second ports selectively coupled with the first ports and that relay the data input to any of the second ports; and a control device that controls the switch devices and the relay device; wherein the control device includes: a port monitoring unit that monitors usage states of the switch-side ports of each of the switch devices; a port-assignment control unit that controls, on a basis of a result of the monitoring performed by the port-monitoring unit, switching of connections between the second ports and the first ports of the relay device so that ports included in the second ports and coupled via any of the first ports to the ports that are included in the switch-side ports of the switch devices and that are not in use are collectively coupled with at least one of the switch devices; and a power control unit that stops a supply of the power to the at least one of the switch devices in which all of the switch-side ports are put into non-used states by the switching control of the port-assignment control unit.