Siemens SIMATIC NET PROFIBUS Owner's Manual page 71

Value Factors
To be able to define permitted configurations, a method is necessary with which
the attached components can be evaluated in terms of their capacitive bus load.
This is achieved by assigning value factors to the components
(see Table 3-4 ).
PROFIBUS interfaces implemented as 9-pin sub-D female connectors (CPs,
OLMs...), do not have their own value factors. These are already taken into
account in the values listed in the table.
Table 3-4 Values for Segments at 1.5 Mbps
Product Name
Bus terminal with 1.5 m long tap line
(Order no. 6GK1 500-0AA00, Version 2)
Bus terminal with 1.5 m long tap line, with PG interface
(Order no. 6GK1 500-0DA00, Version 2)
Bus terminal with 3.0 m long tap line
(Order no. 6GK1 500-0BA00, Version 2)
Bus connector with 30 cable outlet
(Order no. 6ES7 972-0BA30-0XA0)
Bus connector with axial cable outlet
Bus connector with axial cable outlet for FastConnect system
Bus connector with 90 cable outlet
Bus connector with 90 cable outlet with PG interface
Bus connector with 90 cable outlet for FastConnect system
972-0BA50-0XA0)
Bus connector with 90 cable outlet with PG interface
Bus connector with 35 cable outlet
Bus connector with 35 cable outlet with PG interface
(Order no.: 6ES7 972-0BB40-0XA0
Bus terminal BT12M (Order no. 6GK1500-0AA10)
RS-485 repeater (attachment of bus segments) (Order no. 6ES7 972-0AA01-0XA0)
PROFIBUS terminator (active RS-485 attachment element)
(Order no. 6ES7 972-0DA01-0AA0)
SIMATIC S5/S7 connecting cable for 12 Mbps PG attachment to PROFIBUS-DP (Order
no.: 6ES7 901-4BD00-0XA0)
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
(Order no.: 6GK1 500-0EA02)
(Order no.: 6ES7 972-0BA11-0XA0)
(Order no.: 6ES7 972-0BB11-0XA0)
(Order no.: 6ES7 972-0BB50-0XA0)
(Order no.: 6ES7 972-0BA40-0XA0
)
Configuring Networks
(Order no.: 6GK1 500-0FC00)
(Order no.: 6ES7
)
Value (V)
1.5
1.5
2.5
0.7
0.1
0.1
0.1
0.1
0.5
3-5