Fieldbus cable
Table 5:
Cable recommendation
Only cables complying with IEC 61158 or IEC 61784, cable type A, may be used for Profibus DP wiring.
135 to 165 Ohm, at a measurement frequency between 3 and 20 MHz
Impedance
< 30 pF per metre
Cable capacity
> 0.64 mm
Wire diameter
> 0.34 mm², corresponds to AWG 22
Cross section
< 110 Ohm per km
Loop resistance
CU shielding braid or shielding braid and shielding foil
Screening
Prior to installation, please note:
●
Connect maximum 32 devices to one segment.
●
If more devices are to be connected:
-
Allot devices to different segments.
-
Connect segments using repeaters.
●
Install fieldbus cables at a distance of minimum 20 cm to other cables.
●
If possible, fieldbus cables should be laid in a separate, conductive, and earthed
cable tray.
●
Ensure absence of equipotential earth bonding differences between the indi-
vidual devices at fieldbus (perform an equipotential earth bonding).
1,500
500
187.5
≥
93.75
Baud rate [kbit/s]
200
400
1,000
1,200
Maximum segment length [m]
6.2.
Terminal compartment: open
Figure 11: Open terminal compartment
[1]
Cover
[2]
Screws
[3]
Cable entry
[4]
Blanking plug
[5]
Cable gland (not included in scope of delivery)
16
PROFOX / PF-M25 – PF-M100
Electrical connection
Profibus DP