Danfoss VLT PROFIBUS DP MCA 101 Manuale di installazione - Pagina 3
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Installation Guide | VLT® PROFIBUS DP MCA 101
3 Technical Data
3.1 Cabling Requirements
•
Terminate the nodes at the physical ends of each segment. If the bus segment is branched, the device furthest from the segment
connector represents the end of the segment.
•
Terminals 66 and 67 provide a 5 V DC supply, available for external termination.
The PROFIBUS D-sub 9 adapter also features a termination switch. When the D-sub 9 adapter is used, set the termination switch
on the fieldbus option to OFF to avoid double termination.
When the fieldbus is extended with a repeater, terminate the extension at both ends.
To avoid impedance mismatch, use the same cable type throughout the entire network.
3.2 Cable Specifications
Table 2: Cable Specifications
Impedance at a measuring frequency from 3–20 MHz
Resistance
Capacitance
Damping (total wire length)
Cross-section
Cable type
Shielding
Danfoss A/S © 2019.03
N O T I C E
N O T I C E
N O T I C E
135–165 Ω
<110 Ω/km
<30 pF/m
Maximum 9 dB over the whole wire length.
2
Maximum 0.34 mm
, AWG 22.
Twisted in pairs, 1 x 2, 2 x 2, or 1 x 4 wires.
Copper-braided shield, or braided shield and foil shield.
Technical Data
AN274235331989en-000101 / 130R0855 | 3