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8
Manual – Fieldbus Interface INTERBUS UFI11A
Installation and Operation with Autosetup
Connection
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
2
(AWG18)
–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)
05375AXX
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
MOVITRAC
®
07
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
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