14
Manual – DFD11B DeviceNet Fieldbus Interface
4
Installing the DFD11B option card in MOVITRAC® B
Assembly and Installation
Please note:
• If possible, use a 2x2 core twisted and shielded copper cable (data transmission ca-
ble with braided copper shield). Connect the shield on both sides to the electronics
shield clamp of the MOVITRAC
®
B over a large area. Additionally for a 2-core cable,
connect the shield ends to the GND. The cable must meet the following specifica-
tions:
– Cable cross section 0.25 mm
2
(AWG23) ... 0,75 mm
2
(AWG18)
– Line resistance 120 W at 1 MHz
– Capacitance per unit length
≤
40 pF/m at 1 kHz
Suitable cables are e.g. CAN bus or DeviceNet cables.
• The permitted total cable length depends on the baud rate setting of the SBus:
– 250 kBaud: 160 m
– 500 kBaud: 80 m
– 1000 kBaud: 40 m
• Connect the system bus terminating resistor (S1 = ON) at the end of the system bus
connection. Switch off the terminating resistor on the other units (S1 = OFF). The
DFD11B gateway must always be connected either at the beginning or the end of the
system bus connection and features a permanently installed terminating resistor.
• Point-to-point wiring is not permitted.
NOTE
• There must not be any potential displacement between the units connected with the
SBus. Take suitable measures to avoid a potential displacement, e.g. by connect-
ing the unit ground connectors using a separate lead.
