Wrong fit avoided by T-shaped key

Problem: . Designing different plugs and sockets for each unit, on the other hand, increases the number of different types that have to made and held in stock with a consequent bad effect on manufacturing costs Solution: The bases for the different modules used in Rockwell Automation's Entek XM Machine Monitoring and Protection System are each equipped with a 'T' shaped key. This may be turned and clicked into one of ten different positions. On the base of each module is a corresponding 'T' shaped keyhole, whose position may be similarly adjusted with the help of a screwdriver. Multiple bases may be connected to each other by plugs and sockets in their sides. An additional refinement is an arrangement that prevents bases being pulled apart, unless the top modules are removed first. Small lugs prevent this, unless one of the sockets is first pulled inwards, allowing disconnection, after which the bases may be disengaged from each other. Socket retraction is prevented if the top module is still in place. Applications: The XM series is an intelligent system designed to processing diagnostic information in real time. Modules exist for: standard vibration, low frequency vibration, gSE vibration, position measurement, DC voltage and loop current measurement, and RTD and thermocouple measured temperatures. Connectivity is through Ethernet, ControlNet and Profibus gateways. Modules may be applied as a stand alone system or integrated with existing plant information and control systems without need for proprietary instrument racks, back-planes or control networks. A single network cable is all that is required to connect modules to the controller. TS Rockwell Automation