| 摘要 |
The invention relates to a method for measuring a line resistance RL (7) and thus determining control line (16) faults in a hazard warning and control system. The control lines (16) connect a control device (20) to an actuator (10), wherein the control device (20) actuates the actuator (10) using an actuation voltage UA in the case of an event and supplies the actuator (10) with a monitoring voltage UM in the case of a monitoring process, a monitoring module (21) being arranged at the end of the control lines (16) on or in the actuator (10). Furthermore, the control device (20) has a constant current sink (6) or a load resistor, which can be activated by a microcontroller (1), and a switchover device (5), and the beginning of the control lines (16) is arranged on the control device (20). The invention is characterized in that in order to determine the line resistance RL (7), a constant voltage supply is provided in a measurement time interval &Dgr;t&Mgr; by an energy store (9) integrated into the monitoring module (21) and is fed back to the control device (20), and the switchover device (5) deactivates the monitoring voltage UM supply from the control device (20) to the actuator (10) during the entire measurement time interval &Dgr;tM. The invention further relates to a device for measuring a line resistance RL (7) of control line (16) faults. |
