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FEM630 | ELECTROMAGNETIC FLOWMETER | OI/FEM630-EN REV. A
6 ...Electrical connections
...Digital communication
Limits and rules when using ABB fieldbus accessories
Figure 59 Bus cable length depends on the transmission rate
Pro PROFIBUS Line
(Line = Starts at DP Master and goes to last DP/PA Slave)
• Approximately 4 to 8 DP segments through the repeater
(see repeater data sheets)
• Recommended DP transfer rate 500 to 1500 kBit/s
• The slowest DP node determines the transfer rate of the
DP line
•
0 to 125)
Per PROFIBUS DP segment
• (Node = Devices with / without PROFIBUS address)
• Bus termination required at the beginning and end of
each DP segment!
• Trunk cable length (LT) see diagram (length dependent
on transfer rate)
•
1500 kBit/s!
•
1500 kBit/s: LS = 0.0”!
• At 1500 kBit/s and ABB DP cable type A:
–
S
maximum 22 DP nodes (= 21.6 ft / (10” + 2” spare))
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