A sliding door system comprising: at least two sliding doors (D1, D2); an automatic door operator for causing movements of the at least two sliding doors (D1, D2) between closed and open positions; and a control arrangement, wherein the control arrangement comprises: a controller, at least one activity sensor (S5, S6) for detecting, in a closed state or a closing state of the sliding door system, when a person or object approaches the sliding door system and for triggering an opening state for opening the sliding doors (D1, D2); and at least one door presence sensor (S3, S4) for detecting when a person or object occupies a space between or near the sliding doors (D1, D2) when being moved towards each other during the closing state of the sliding door system, characterized in that each sensor (S3, S4, S5, S6) has an active mode and an inactive mode, wherein the sensor consumes no electric power in the inactive mode or substantially less electric power in the inactive mode than in the active mode; and the controller is configured to: when the sliding door system is in the closed state or an open state, cause the at least one activity sensor (S5, S6) to be in the active mode and the at least one door presence sensor (S3, S4) to be in the inactive mode; when the sliding door system is in the opening state, cause all of the at least one activity sensor (S5, S6) and the at least one door presence sensor (S3, S4) to be in the inactive mode; and when the sliding door system is in the closing state, cause all of the at least one activity sensor (S5, S6) and the at least one door presence sensor (S3, S4) to be in the active mode. at least two sliding doors (D1, D2); an automatic door operator for causing movements of the at least two sliding doors (D1, D2) between closed and open positions; and a control arrangement, wherein the control arrangement comprises: a controller, at least one activity sensor (S5, S6) for detecting, in a closed state or a closing state of the sliding door system, when a person or object approaches the sliding door system and for triggering an opening state for opening the sliding doors (D1, D2); and at least one door presence sensor (S3, S4) for detecting when a person or object occupies a space between or near the sliding doors (D1, D2) when being moved towards each other during the closing state of the sliding door system, characterized in that each sensor (S3, S4, S5, S6) has an active mode and an inactive mode, wherein the sensor consumes no electric power in the inactive mode or substantially less electric power in the inactive mode than in the active mode; and the controller is configured to: when the sliding door system is in the closed state or an open state, cause the at least one activity sensor (S5, S6) to be in the active mode and the at least one door presence sensor (S3, S4) to be in the inactive mode; when the sliding door system is in the opening state, cause all of the at least one activity sensor (S5, S6) and the at least one door presence sensor (S3, S4) to be in the inactive mode; and when the sliding door system is in the closing state, cause all of the at least one activity sensor (S5, S6) and the at least one door presence sensor (S3, S4) to be in the active mode. a controller, at least one activity sensor (S5, S6) for detecting, in a closed state or a closing state of the sliding door system, when a person or object approaches the sliding door system and for triggering an opening state for opening the sliding doors (D1, D2); and at least one door presence sensor (S3, S4) for detecting when a person or object occupies a space between or near the sliding doors (D1, D2) when being moved towards each other during the closing state of the sliding door system, characterized in that each sensor (S3, S4, S5, S6) has an active mode and an inactive mode, wherein the sensor consumes no electric power in the inactive mode or substantially less electric power in the inactive mode than in the active mode; and the controller is configured to: when the sliding door system is in the closed state or an open state, cause the at least one activity sensor (S5, S6) to be in the active mode and the at least one door presence sensor (S3, S4) to be in the inactive mode; when the sliding door system is in the opening state, cause all of the at least one activity sensor (S5, S6) and the at least one door presence sensor (S3, S4) to be in the inactive mode; and when the sliding door system is in the closing state, cause all of the at least one activity sensor (S5, S6) and the at least one door presence sensor (S3, S4) to be in the active mode. when the sliding door system is in the closed state or an open state, cause the at least one activity sensor (S5, S6) to be in the active mode and the at least one door presence sensor (S3, S4) to be in the inactive mode; when the sliding door system is in the opening state, cause all of the at least one activity sensor (S5, S6) and the at least one door presence sensor (S3, S4) to be in the inactive mode; and when the sliding door system is in the closing state, cause all of the at least one activity sensor (S5, S6) and the at least one door presence sensor (S3, S4) to be in the active mode.