SEW-Eurodrive INTERBUS UFI11A Manual page 8

Field bus interface
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3
Installation and Operation with Autosetup
Connection
Fig. 5: System bus connection
UFI11A
COM
= RS-485 reference
/DO
= Data out inverted
DO
= Data out
/DI
= Data in inverted
DI
= Data in
GND
= System bus reference
SC11
= System bus high
SC12
= System bus low
8
®
MOVITRAC
GND
= System bus reference
SC22
= System bus outgoing low
SC21
= System bus outgoing high
SC12
= System bus incoming low
SC11
= System bus incoming high
S12
= System bus terminating resistor
Notes on SBus configuration:
Use a twisted and shielded copper cable (data transmission cable with braided cop-
per shield). Connect the shield at both ends to the electronics shield clamp of MOVI-
®
TRAC
07 or the UFI11A and ensure a large area of contact between the shield and
clamp. Also connect the ends of the shield to GND. The cable must meet the follo-
wing specifications (CAN bus or DeviceNet cables are suitable, for example):
–Conductor cross section 0.75 mm
–Cable resistance 120 Ω at 1 MHz
–Capacitance per unit length ≤ 40 pF/m (12 pF/ft) at 1 kHz
The permitted total cable length depends on the baud rate setting of the SBus:
–250 kbaud:
160 m (528 ft)
–500 kbaud:
80 m (264 ft)
–1000 kbaud: 40 m (132 ft)
07
2
(AWG18)
Manual – Fieldbus Interface INTERBUS UFI11A
05375AXX

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