Wiring Proline Promag 55 PROFIBUS DP/PA
38 Endress+Hauser
Suitable fieldbus cables from various manufacturers for non-hazardous areas are listed below:
• Siemens: 6XV1 830-5BH10
• Belden: 3076F
• Kerpen: CeL-PE/OSCR/PVC/FRLA FB-02YS(ST)YFL
Maximum overall cable length
The maximum network expansion depends on the type of explosion protection and the cable
specifications. The overall cable length combines the length of the main cable and the length of all
spurs (> 1 m) (> 3 ft).
Note the following points:
• The maximum permissible overall cable length depends on the cable type used:
• If repeaters are used, the maximum permissible cable length is doubled.
A maximum of three repeaters are permitted between user and master.
Maximum spur length
The line between the distribution box and field device is described as a spur.
In the case of non-Ex applications, the max. length of a spur depends on the number of
spurs (> 1 m) (> 3 ft):
Number of field devices
In systems that meet FISCO with EEx ia type of protection, the line length is limited to max. 1000 m
(3280 in). A maximum of 32 users per segment in non-Ex areas or a maximum of 10 users in an
Ex-area (EEx ia IIC) is possible. The actual number of users must be determined during
configuration.
Bus termination
The start and end of each fieldbus segment are always to be terminated with a bus terminator. With
various junction boxes (non-Ex), the bus termination can be activated via a switch. If this is not the
case, a separate bus terminator must be installed.
Note the following points:
• In the case of a branched bus segment, the device furthest from the segment coupler represents
the end of the bus.
• If the fieldbus is extended with a repeater then the extension must also be terminated at both
ends.
Further information
General information and further notes regarding the wiring are contained in BA034S/04:
"Guidelines for planning and commissioning, PROFIBUS DP/PA, field communication."
Type A 1900 m 6200 ft
Type B 1200 m 4000 ft
Number of spurs 1…12 13…14 15…18 19…24 25…32
Max. length per spur
[m] 120 90 60 30 1
[ft] 400 300 200 100 3
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