Series 90-70 Genius Bus Controller Manual, GFK-2017

2Connecting the Serial BusFor information about bus selection and installation, you should refer to theGenius I/O System User’s Manual.Connect the bus cable to the terminal assembly on the front of the Bus Controller. Thetie–down screws can be removed to accommodate ring-type connectors. Terminaldesignations, illustrated below, are also shown on the module faceplate.The maximum exposed length of bare wires should be two inches. For addedprotection, each shield drain wire should be insulated with spaghetti tubing to preventthe Shield In and Shield Out wires from touching each other or the signal wires.INOUTSERIAL 1 SERIAL 1SERIAL 2SHIELDOUTSERIAL 2SHIELDINNOTUSEDReplacing an Older Bus ControllerIf this hardware (GIOC1) is being used to replace older hardware (GIOA1 or GIOB1:see markscreen on the edge of the board), the GENIUS bus connections to the BusController must be rewired. Refer to the wiring label inside the module cover for detalsconcerning the proper wiring of the connector. Note that GIOC1 hardware was alsoused with Genius Bus Controller versions IC697BEM731B and C.Shield In and Shield Out Connections in an Existing InstallationThe actual positions of the Bus Controller’s Shield In and Shield Out terminals arecorrectly shown above. On the faceplates of older Bus Controllers and in earlierrevisions of the documentation, these terminals are shown reversed. Regardless ofthe markings on the faceplate, all Series 90-70 Bus Controllers have their Shield In andShield Out terminals in the positions shown above.Because of this inconsistency, Bus Controllers in an existing installation may have theirShield In and Shield Out terminals incorrectly connected (that is, not as illustratedabove). For most applications, this should not be a problem, and rewiring is notnecessary. If noise immunity is a particular concern, however, rewiring of the Shield Inand Shield Out terminals on these older Bus Controllers is recommended.GFK-2017 Chapter 2 Installation 2-3