Burkert 8681 - Page 86

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büS/CAN open-Design
Dierentconnectioncablesandaplug-inpowersupplyunitaswellasamainsadapterareincludedinasmall
equipmentcase(“USBbüSinterfaceSet1”-seeinthelasttable“Standardserviceequipment“inchapter“16
AccessoriesforbüSdevices”onpage120).Thisallowstocongurealsoasingledevice.
Important notes for network building:
•Each gateway
cancontrolupto63nodes(ControlHeadsType8681büS/CANopen)ifthenetwork
topologyconsiders the max. permittedcable length and therequiredpower supply.Each node
requiresaunique “Node ID”, otherwise an error occurs.
•The max. total line length is 200 m for 125 kbit/s, 100 m for 250 kbit/s, 40 m for 500 kbit/s.
•The max. cable length for a single drop line is 6 m, the max. total length of all drop lines in the
network is 100 m for 125 kbit/s, 55 m for 250 kbit/s, 30 m for 500 kbit/s.
•If the voltage drop is too large, an additional power supply can feed in at a CAN junction box
(PWRINconnection).Inthiscase,connectCANONLYtoCANINusingaCANcable.
Thiscable(whichinterconnectstheCANjunctionboxesat“CANONLY”and“CANIN”)cannot
beusedforT-connectorstobranch“nodes”becausenopowerissuppliedtothiscable(compare
example 3 in chapter “17Cablingexamples(büS/CANopen)”onpage122).
•Unused or open connections must be closed with the appropriate protective caps.
•
Requiredtightening torque forallplug-inconnections(cables,T-pieces,...)toensuretherequired
leak-tightness against moisture: 0.6 Nm + 0.1 Nm.
•The CAN cable must be “terminated” at both ends: connect a terminating resistor (120 ohms) to
the end of the CAN cable / T-connector or, if the line ends with a CAN junction box, connect the
terminating resistor to the CAN OUT connection.
•For service work and also when reading out CAN data, a PC with Bürkert Communicator Type 8920
canbeconnectedtoanyfreeconnectionattheCANjunctionboxortotheCANONLYconnection.
A büSstick is necessary to connect the PC to the CAN network.
•T-connectors
canbeusedtoconnectsingle“nodes”oraPCtoreadouttheCANdata(via
BürkertCommunicator).
english
Control Head Type 8681