HIMA Z7127 cable

　The bus cable must be terminated in both ends. In the two communication interfaces situated at the end of the bus, only one bus cable is connected. The other part of the BNC T-connector is used for termination of the bus with the bus terminator plug. The bus cable must be grounded, but only in one end of the bus segment. This is done by grounding the wire on the bus termination plug in one (and only one) end of the cable. For installation with redundant cables, each of the two cables must be grounded.The user must also choose between a single bus media installation and a redundant media installation. In the redundant case two bus media are needed for each communication interface, as depicted in Figure 80.When redundant cable is used, different colors for the bending protection are used to easily identify the lines (red for cable 1, blue for cable 2).

NOTES 

  Furthermore, the user must make sure that the cable length between any two stations on the bus is less than 1200 meter (3600 ft.). The communication on Advant Fieldbus 100 will not operate properly if this is not observed. See Table 6 for information concerning equipment capability. If the cable is connected to the cable 1 connector it must be connected to the same connector on all communication interfaces.

Termination and Grounding of Coaxial Cables

   The basic rules concerning Advant Fieldbus 100 terminations are as follows: • Coaxial segments of an Advant Fieldbus 100 must be terminated on both ends. • he coaxial sections end points MUST be terminated with a 75 ohm BNC terminating plug.The following rules generally apply with regard to the connection of Advant Fieldbus 100 to modems and modems: • he shielding, when Coaxial or twisted pair cable is used, must be grounded. The shielding is grounded in one end only. • All cable shielding connections must be shorter than 50 mm (2”). For further information regarding cable shield grounding and installation, please refer to the manual Advant OCS Installation Rules.