Product specifications

CI851 and TP851 – PROFIBUS DP Interface Appendix A Hardware Units
284 3BSE036351-510 A
CI851 and TP851 – PROFIBUS DP Interface
Key Features
Provides one PROFIBUS DP port, (a DB9 female
connector located on the TP851 Baseplate).
Simple DIN-rail mounting
The CI851 handles cyclic read and write messages
to the slaves on the PROFIBUS DP. The minimum
cycle time can be 1 ms, however, but this will
depend on the baud rate used and the number of
attached slaves.
By using repeaters it is possible to connect a
maximum of 124 nodes to one PROFIBUS DP
(32 nodes are permitted on one segment).
Pre-set, two-letter Alpha code locking device
installed in unit base prevents mounting of
incompatible components.
Description
CI851 / TP851 is used for connecting to remote I/O. Via
an external gateway on PROFIBUS DP, field instruments
(on PROFIBUS DP) can be connected to AC 800M. The
TP851 Baseplate has one female DB9 connector for
connecting PROFIBUS DP. The baseplate has a code
lock, see Table 4 on page 75, that prevents the installation of an incorrect type of
unit onto the TP851 Baseplate.
The CI851 expansion unit contains the CEX-Bus logic, a communication unit and a
DC/DC converter that supplies appropriate voltages from the +24 V supply, via the
CEX-Bus. The PROFIBUS DP must always be terminated at the two outer nodes.