Proline Prowirl F 200 PROFIBUS PA Electrical connection
Endress+Hauser 31
Maximum overall cable length
The maximum network expansion depends on the type of protection and the cable
specifications. The overall cable length combines the length of the main cable and the
length of all spurs >1 m (3.28 ft).
The maximum overall cable length for cable type A: 1 900 m (6 200 ft)
If repeaters are used, the maximum permissible cable length is doubled. A maximum of
three repeaters are permitted between the 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
(3.28 ft):
Number of spurs Max. length per spur
1…12 120 m (400 ft)
13…14 90 m (300 ft)
15…18 60 m (200 ft)
19…24 30 m (100 ft)
25…32 1 m (3 ft)
Number of field devices
In the case of systems in accordance with the Fieldbus Intrinsically Safe Concept (FISCO)
with EEx ia explosion protection, the cable length is limited to a maximum length of 1000
m (3300 ft). 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 the planning stage.
Bus termination
The start and end of each fieldbus segment must always be terminated by 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. Please also
note the following:
• 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.
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