Practical Industrial Data Networks:Design, Installation and ...

160 Practical Industrial Data Networks: Design, Installation and Troubleshooting12.3.4 Micro (sealed) connectorThis connector is effectively a 12 mm diameter miniature version of the mini styleconnector, except its suitability is for thin wire drop connections requiring reduction inboth physical and current carrying capacity.It has 5 pins, 4 in a circular periphery pattern and the fifth pin in the center. Thisconnector should have a minimum voltage rating of 25 volts, and for drop connections acurrent rating of 3 amps is required. The male component must mate with Lumberg styleRST5-56/xm or equivalent, the female component part must also conform to Lumbergstyle RST5-56/xm or equivalent. Additional options can include oil and water resistance.34435521 12Male (pins)Female (sockets)1 - drain2-V+3-V−4 - CAN_H5 - CAN_LbareredblackwhiteblueFigure 12.6Sealed microstyle connector (face views)12.4 Cable budgetsDeviceNet’s transmission media can be constructed of either DeviceNet thick, thin or flatcable or a combination thereof. Thick or flat cable is used for long distances and isstronger and more resilient than the thin cable, which is mainly used as a local drop lineconnecting nodes to the main trunk line.The trunk line supports only tap or multiport taps that connect drop lines into theassociated node. Branching structures are allowed only on drop lines and not on the maintrunk line.The following tables show the distance vs length trade-off for the different types ofcable.