Siemens SIMATIC ET 200AL System Manual page 1241

Description
2.2 Structure of PROFIBUS networks
Selection criteria for networking
The table below includes selection criteria for electrical and optical networking of PROFIBUS
devices:
Table 2- 3
Criteria
Transmission
medium
Distances
Topology
Transmission
protocols
Connection of
devices by means
of
Electrical network
segments can be
connected
● Suitable
– Not relevant for this application
1) Depending on data rate and type of service used
2) Depending on cable type used
Installation guideline for PROFIBUS networks
A PROFIBUS segment must be terminated at the start and end; passively with a connector
or actively with a bus terminating resistor.
The same principles apply to the installation of a PROFIBUS network as described in the
SIMATIC NET PROFIBUS networks
(http://support.automation.siemens.com/WW/view/en/35222591) manual.
18
Selection criteria for electrical and optical networking
Shielded two-wire
line
POF
PCF
Glass
Max. network span
Between two devices up to 1 km
Bus
Linear
Tree
Ring
OLM
Integrated interfaces
Bus terminal
Bus connector
Electrical Optical network
PROFIBUS with OLM
● –
– ●
– ●
– ●
PROFIBUS DP: 90 km
9.6 km
PROFIBUS PA:
1.9 km
up to 15 km
1)
● –
– ●
● ●
– ●
DP, PA DP, PA
– ●
● –
● –
● –
● ●
Function Manual, 12/2014, A5E03775446-AC
Optical network
with OBT
–
●
●
–
9.6 km
up to 300 m
2) 2)
–
●
●
●
DP
–
●
●
–
–
PROFIBUS with STEP 7 V13