METHOD AND DEVICE FOR MEASURING A LINE RESISTANCE OF CONTROL LINES IN HAZARD WARNING AND CONTROL SYSTEMS

摘要

A method for measuring a line resistance RL (7) and 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) 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 using a monitoring module (21). Furthermore, the control device (20) has a constant current sink (6), which can be activated by a microcontroller (1), and a switchover device (5). In order to determine the line resistance RL (7), a constant voltage supply is provided in a measurement time interval ΔtM 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 ΔtM.

主权项

1. A method for measuring a line resistance RL (7) and thus for determining faults of control lines (16) in a hazard warning and control system, the control lines (16) connecting a control device (20) to an actuator (10), the control device (20) in the case of an incident driving the actuator (10) using a drive voltage UA and in the case of monitoring supplying the actuator (10) with a monitoring voltage UM, there being arranged at or in the actuator (10) a monitoring module (21) at the end of the control lines (16), the control device (20) furthermore exhibiting a constant current sink (6) connectable via a microcontroller (1) or a connectable load resistance and a switching device (5) and the beginning of the control lines (16) being arranged on the control device (20), wherein for determining the line resistance RL (7) a constant voltage supply is provided in a measurement time interval ΔtM by means of an energy storage (9) integrated into the monitoring module (21), and fed back into the control device (20), and in the entire measurement time interval ΔtM the switching device (5) switches off the supply of monitoring voltage UM provided by the control device (20) for the actuator (10).