Table 10-9
Certificates and approvals
Certificates and approvals
Explosion protection
ATEX II 2G Ex db eb mb [ia Ga] IIC T6…T3 Gb
10.2
PROFIBUS PA cable specifications
Recommended cable types
It is recommended to use cable type A or B (cp. IEC 61158-2 (MBP)). Both types have cable
shielding that guarantees adequate protection from electromagnetic interference and thus the
most reliable data transfer. With cable type B more than one fieldbus (with the same degree of
protection) may be operated in a cable. No other circuits are permissible in the same cable.
Table 10-10 Recommended cable types
Type A
Type B
Cable structure
Twisted pair, individual shield
Multiple twisted pairs, overall
shield
Wire size
0.8 mm
2
(AWG 18)
0.32 mm
2
(AWG 22)
Loop resistance (DC)
44 Ω/km
112 Ω/km
Impedance at 31.25 kHz
100 Ω ± 20%
100 Ω ± 30%
Attenuation at 39 kHz
3 dB/km
5 dB/km
Capacitive asymmetry
2 nF/km
2 nF/km
Envelope delay distortion (7.9 to
39 kHz)
1.7 μs/km
*
Shield coverage
90%
*
Max. cable length (inc. spurs >1
m)
1900 m (6233 ft)
1200 m (3937 ft)
* not specified
Siemens provides a suitable cable for non-hazardous area with following order number - 6XV1
830-5BH10
Overall cable length
The overall cable length is made up of the length of the main cable and the length of all spurs
(>1 m/3.28 ft).
The maximum network expansion depends on the type of ignition protection and the cable
specifications.
Note
If repeaters are used the maximum allowed cable length is doubled. Max. three repeaters are
permitted between user and master.
Technical specifications
10.2 PROFIBUS PA cable specifications
SITRANS FUS060 with PROFIBUS PA
Operating Instructions, 09/2021, A5E02225054-AD
83