Specifications

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MX Protection, Control and Monitoring Features FCD LMENTB2300-01 – 07/08
For fieldbus technology and cabling information, refer to the following documents:
F•
o u n d a t i o n Fieldbus Wiring and Installation 31.25 kbits/s, Voltage Mode, Wire Medium AG-140
F•
o u n d a t i o n Fieldbus Technical Overview, FD-043
Relcom Inc. Fieldbus Wiring Design and Installation Guide•
ANSI/ISA-S50.02, Part 2-1992, Fieldbus Standard for Use in Industrial Control Systems Part 2: •
Physical Layer Specification and Service Definition
F•
o u n d a t i o n Fieldbus FF-890 and FF-891, Fo u n d a t i o n Specification, Function Block Application
Process, Part 1 and 2.
Reference can be made to the following books:
Fieldbuses for Process Control: Engineering, Operation, and Maintenance.• ISBN 1-55617-760-7.
Network Wiring – F
o u n d a t i o n Fieldbus
Belden 3076F Specifications•
Key Specifications – 18 AWG
Nominal Capacitance 80 pF/m•
Nominal DC Resistance 24 ohm/km max•
Characteristic Impedance 100 ohms•
Nominal Impedance – 100.0•
13.3 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 13.1 shows specifications that need to be fulfilled by the Profibus cable.
Table 13.1 – 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.