DeviceNet™ Troubleshooting - TURCK

1 G1001 Publised 11/11/2013 FIELD GUIDED eviceNet Troubleshooting2 1-800-544-7769 Fax: (763) 553-0708 TURCK Minneapolis, MN 55441 1-800-544-7769 Fax: (763) 553-0708 TURCK Minneapolis, MN 554413 SCOPEhe purpose of this Troubleshooting guide is to direct qualified service personnel to the causes of network problems and provide remedies. The primary goal of Troubleshooting is to minimize network downtime. Test proceduresdescribed in this Troubleshooting Guide require the use of test equipment to measure voltage, current, and resistance of the physical media layer.

2 It is usually sufficient to have a true RSM multimeter, such as Fluke 87-3 Digital Multimeter or similar to run tests and obtain reliable measurements. For information on designing DeviceNet systems, refer to ODVA publication 27: DeviceNet Planning and Installation Manual . Network ComponentsDeviceNet uses a trunk line and drop line topology to connect nodes for communication. Here is an example:. TR = Terminating ResistorComponentDescriptionTrunk LineThe network cable between terminators. It is usually a thick LineThe network cable between the trunk and nodes. Each drop line may be no longer than 6 meters (20 feet)Ta pA branching point from the trunk line.

3 There may be one node on a drop line, as with a tee tap, or multiple drop lines, as with a multiport junction ResistorThe 121 Ohm resistor that is connected to the end of the Trunk Line. There are two terminators per addressable device that communicates on the network. There may be as many as 64 nodes per SupplyThe 24-volt DC source that powers network communication. There may be multiple power supplies on a network, located anywhere on the LinePOWER SUPPLYDrop LineTrunk LineTRTRDrop 1-800-544-7769 Fax: (763) 553-0708 TURCK Minneapolis, MN 55441 3 Wiring and Connector Pin DefinitionsThere are five conductors in DeviceNet cables.

4 There are three connector types commonly used on DeviceNet systems: 7/8 16 minifast (mini), M12 eurofast (micro), and screw terminal (open). Table I shows the connector pin definitions and Table II shows the connector ColorDescriptionShield DrainBareConnection to the shields in the cableV+RedConnection to the bus 24 VDC supplyV-BlackConnection to the bus supply common (0 VDC)CANHBlueData connection (high differential)CANLW hiteData connection (low differential) DeviceNet Cable ClassificationTable I: Pin DefinitionsMale mini ConnectorFemale mini ConnectorMale micro ConnectorFemale micro ConnectorOpen Female Connector Rear View1 = Bare (Drain) 2 = Red (V+) 3 = Black (V-) 4 = White (CANH) 5 = Blue (CANL)1 = Bare (Drain) 2 = Red (V+) 3 = Black (V-) 4 = White (CANH) 5 = Blue (CANL)5 = Red (V+) 4 = White (CANH) 3 = Bare (Drain) 2 = Blue (CANL) 1 = Black (V-)Table II: Connector Styles minifast (mini)eurofast (micro)Open Style Front ViewMale ConnectorsFemale Connectors4 1-800-544-7769 Fax: (763) 553-0708 TURCK Minneapolis, MN 55441 1-800-544-7769 Fax.

5 (763) 553-0708 TURCK Minneapolis, MN 55441 5 DeviceNet cables are classified according to DeviceNet Specification1 as:Round Cables Thick Cable or Cable II Thin Cable or Cable IFlat CablesTable III: Cable Specifications (provides data for each cable type listed in the DeviceNet Specification) Data PairThick CableCable IIThin CableCable IFlat CableMin. Conductor Size: 19 strands min.#18#18#24#24#16 Insulation inColorCAN_H White CAN_L Light BlueImpedance120 Ohm +/-10% @ MHzMax. Propagation nSec/ftDCR - at 20 degrees C (max) Ohms /1000 Ohms /1000 Ohms /1000 ft28 Ohms /1000 Ohms /1000 ftTape Shield2 mil/1 mil, Al/Mylar1 mil/1 mil, Al/Mylar2 mil/1 mil, Al/Mylar1 mil/1 mil, Al/MylarN/APower PairMin.

6 Conductor Size#15#15#22#22#160 Insulation inColorV+ Red V- BlackDCR - at 20 degrees Ohms /1000 Ohms /1000 Ohms /1000 Ohms /1000 Ohms /1000 ftTape Shield1 mil/1 mil, Al/Mylar1 mil/1 mil, Al/Mylar1 mil/1 mil, Al/Mylar1 mil/1 mil, Al/MylarN/AGeneral SpecificationsOutside - Specified by - Specified by VendorN/ABent Radius (d = diameter)7 x d, fixed 20 x d, flexSuitable for Application7 x d, fixed 20 x d, flexSuitable for Application10 x diameterDrain Wire#18#18#22#22N/AAgency CertificationNEC (UL) CL2/CL3 w/ local gov t regulationsNEC (UL) CL2/CL3 w/ local gov t regulationsNEC (UL) CL2 ShieldBraid 36 AWG or mm CuBraid 36 AWG or mm CuTape 1 mil/1 mil, Al/MylarTape 1 mil/1 mil, Al/MylarN/A 1-800-544-7769 Fax: (763) 553-0708 TURCK Minneapolis, MN 55441 5 Thick Cable and Cable IIThe maximum cable length used in trunk-drop topology depends on the data rate:Table IV.

7 Thick Cable and Cable II Topology Communication RateNetwork LengthTrunk LengthMaximum DropCumulative Drop125 kb500 m (1640ft)500 m (1640 ft)6 m (20ft)156 m (512 ft)250 kb250 m (820 ft)250 m (820 ft)6 m (20 ft)78 m (256 ft)500 kb100 m (328 ft)100 m (328 ft)6 m (20 ft)39 m (128 ft) The length of the network is the sum of the trunk length and cumulative drop Cable CapacityThe power distribution chart, Figure 1, shows the maximum allowed current through the power conductors of the thick cable. Distance is measured from a single 24 VDC power source. If the maximum current exceeds the specified value at any given point on the network, the power supply systems should be re-designed.

8 Figure 1 provides thick cable current 1: Current available through power conductors of thick cable Thin Cable and Cable IThe maximum cable length used in trunk-drop topology, based on the data rate is:Table V: Thin Cable and Cable I Topology Communication RateTrunk LengthMaximum DropCumulative Drop125 kb100 m (328 ft)6 m (20 ft)100 m (328 ft)250 kb100 m (328 ft)6 m (20 ft)78 m (256 ft)500 kb100 m (328 ft)6 m (20 ft)39 m (128 ft) Length of Network in meters (feet)Maximum Current Capability (amps)0012345678501001502002503003504004 50500(164)(328)(492)(656)(820)(1984)(114 8)(1312)(1476)(1640) 1-800-544-7769 Fax: (763) 553-0708 TURCK Minneapolis, MN 55441 1-800-544-7769 Fax.

9 (763) 553-0708 TURCK Minneapolis, MN 55441 7 Thin Cable CapacityPower distribution chart: Figure 2, shows the maximum allowed current through the power conductors of the thin cable. The distance is measured from a single 24 VDC power source. If the maximum current exceeds the specified value at any given point of the network, the power supply system should be re-designed. Figure 2 provides thin cable current ratings. Flat CableThe maximum flat cable length used in trunk topology, based on the data rate is:Table VI: Flat Cable TopologyCommunication RateTrunk LengthMaximum DropCumulative Drop125 kb420 m (1378 ft)6 m (20 ft)156 m (512 ft)250 kb200 m (656 ft)6 m (20 ft)78 m (256 ft)500 kb100 m (328 ft)6 m (20 ft)39 m (128 ft)Flat Cable CapacityFigure 3: Current available through power conductors of flat cableLength of Network in meters (feet)Maximum Current Capability (amps)0102030406070901005080(262)(164)(3 28)(295)(230)(197)(131)(98)(66)(33) 1.

10 Current available through power conductors of thick cableLength of Network in meters (feet)Maximum Current Capability (amps) (41)(82)(164)(328)(492)(656)(820)(984)(1 148)(1312) (1378) 1-800-544-7769 Fax: (763) 553-0708 TURCK Minneapolis, MN 55441 7 QUICK STARTKnow the Network LayoutAn essential part of the Troubleshooting process is knowing the layout of the network. Survey the network to determine the location (or existence) of these Topology The trunk cable connects nodes and taps. Look for a terminating resistor at each end. The drop lines are the non-terminated cables that connect nodes to the of Nodes Count the nodes and note their location on the of Power Supplies There may be more than one power supply on a network, located at the end, middle, or anywhere along the cable.