16
Manual – Fieldbus Interface DFE24B EtherCAT®
4
Installing the DFE24B option card in MOVITRAC
®
B
Assembly and Installation Notes
Please note:
• Use a 2×2-core twisted pair and shielded copper cable (data transmission cable 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, con-
nect the shield ends to the GND. The cable must meet the following specifications:
– Cable cross section 0.25 mm
2
(AWG18) – 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
Suitable cables are CAN or DeviceNet cables.
• The permitted total cable length depends on the baud rate setting of the SBus:
– 250 kBd: 160 m (528 ft)
– 500 kBd: 80 m (264 ft)
– 1000 kBd: 40 m (132 ft)
• 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
DFE24B gateway must always be connected either at the beginning or the end of the
system bus connection and feature a permanently installed terminating resistor.
X12:9 GND reference potential for binary inputs
X12 Terminal assignment
INFORMATION
There must not be any potential displacement between the units connected via the
SBus. Take suitable measures to avoid potential displacement, e.g. by connecting the
unit ground connectors using a separate lead.
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