Hitachi HIDIC EH-150 Applications Manual page 21

4.3.2 Cable parameters
The bus cable is specified in EN 50170 part 8-2 as "Cable Type A", and should comply with the parameters in the table
below.
Cable Type B, which is also described in EN 50170, is outdated and should no longer be used.
Example of cable for Profibus DP: Siemens, Order number: 6XV1830-0EH10
Parameter
Characteristic impedance
Operating capacity
Loop resistance
Core diameter
Core cross-section
*) The cable cross-sections used should be compatible with the mechanical specifications of the bus interface connector.
4.3.3 Maximum length of bus segment
The cable parameters specified for standard Type A bus cables result in the maximum length of each bus segment for the
respective data transfer rate shown in table 4.3 .
Data transfer rate (kbit/s)
Max. segment length (m)
<Notes of wiring>
1) Add a ferrite core
Insert a ferrite core with the bus cable.
Insert a ferrite core with the input/output shielded wires, and wind the shielded wires by
one turn around the ferrite core.
2) To guarantee correct operation, connect to Functional Earth from screw of D-sub female
connector.
Fig. 4.2 Functional Earth
Table 4.2 Cable parameters
Cable type A
135 to 165 Ω at a frequency of 3 to 20 MHz
< 30 pF/m
<= 110 Ω/km
> 0.64 mm *)
2
> 0.34 mm *)
Table 4.3 Maximum cable lengths per segment
9.6 19.2 93.75
1200 1200 1200
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Chapter 4 Installation and Wiring
187.5 500 1500
1000 400 200
3000 6000 12000
100 100 100