To monitor individual safety components or to supply individual operation instructions to corresponding safety components. A connector includes a component-side terminal group used for connection to a corresponding safety component, a downstream-side terminal group used for connection to the downstream side and an upstream-side terminal group used for connection to the upstream side. The downstream-side terminal group includes a downstream-side main information terminal connected to the component-side main information terminal and a downstream-side other terminal different from the downstream-side main information terminal. The upstream-side terminal group includes an upstream-side information terminal capable of being connected to a downstream-side main information terminal of a connector member on the upstream side.