Flowserve UEX Limitorque - Manual (Page 51)

51
Limitorque UEX FCD LMENIM1205-03-AQ – 05/15
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16.3 Network Wiring – Profibus DP and PA
Please refer to LMENIM2336 for detailed installation instructions.
Profibus is based on RS 485 communication. The standard EN 50170 specifies the cable for use with
Profibus DP and PA. Table 16.1 shows specifications that need to be fulfilled by the Profibus cable.
Table 16.1 – Specifications for the Profibus Cable
Parameter Type – Profibus DP
Impedance 135 to 165 ohm/3 to 20 MHz
Capacity < 30 pF/m
Resistance < 110 ohm/km
Wire gauge > 0.64 mm
Conductor area > 0.34 mm 2
The Profibus DP cable is a shielded twisted pair cable.
In general, there are two different types of cables available. The most commonly used cable has
solid wire for the Profibus line.
When there is a need for more flexiblity (bending) and higher environmental resistance, a cable with
stranded wire for the Profibus line and special jackets shall be used.
Limitorque recommends the use of:
• Belden 3079A Specifications, 22 AWG, shielded, solid two conductor
Key Specifications
• Capacitance/ft = 8.5 pF
• Nominal Impedance (ohms) – 150.0
Network Wiring – Profibus PA – Belden 3076F
Please refer to IEC 61158 and ANSI/ISA S.50.02 Part 2-1992 for network wiring guidelines.
Maximum number of devices on a segment = 32 (including repeaters)
Table 16.2 – Maximum Segment Length
Data transfer
rate in kbit/s
9.6 19.2 45.45 93.75 187.5 500 1500 3000 6000 12000
Maximum
segment
length in m
1200 1200 1200 1200 1000 400 200 100 100 100