Specifications

38
MX Protection, Control and Monitoring Features FCD LMENTB2300-01 – 07/08
When there is a need for more flexiblity (bending) and higher environmental resistance, a cable with
stranded wire for the Profibus line and special jackets shall be used.
Limitorque recommends the use of:
Belden 3079A Specifications, 22 AWG, shielded, solid two conductor•
Key Specifications
Capacitance/ft = 8.5 pF •
Nominal Impedance (ohms) – 150.0•
Network Wiring – Profibus PA – Belden 3076F
Please refer to IEC 61158 and ANSI/ISA S.50.02 Part 2-1992 for network wiring guidelines.
Maximum number of devices on a segment = 32 (including repeaters)
Table 13.2 – Maximum Segment Length
Data transfer
rate in kbit/s
9.6 19.2 45.45 93.75 187.5 500 1500 3000 6000 12000
Maximum
segment
length in m
1200 1200 1200 1200 1000 400 200 100 100 100
Figure 13.3 – Typical Profibus System with a DCS Host (Daisy Chain Shown)
Distributed Control
System (Host)
Control Highway
Profibus DP
Interface
PB
Actuator
PB
Actuator
PB
Actuator
PB
Actuator
Terminator
T e rminatorProfibus DP or PA Network
Segment coupler
Power supply
PA Segment coupler
(PA only network)