| 摘要 |
Equipment including at least one plug-in unit and a body device for receiving the plug-in unit is presented. The plug-in unit includes a mechanical structure (108) enabling the plug-in unit to be locked in its operating position with respect to the body device with a fastening element (141) that can be, for example, a fastening screw. The plug-in unit further includes a sensor circuit (111) having first electrical properties when the fastening element is in the position locking the plug-in unit in the operating position and otherwise different electrical properties. The equipment includes a monitoring circuit (112) for generating a signal indicative of a difference between the prevailing electrical properties of the sensor circuit and the first electrical properties, the signal being indicative also of correctness of the installation of the plug-in unit. Thus, the correct installation of the plug-in unit can be electrically indicated and monitored.
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