I/O System S900
Communication Interface for PROFIBUS DP, CI920
3BDD010422R0101 13
3. System specifications
Required system components
The I/O System S900 in its smallest hardware configuration consists of the
following components:
1 x TU921 Termination unit
1 x SA910 Power supply, 24VDC
1 x BP901 Power supply filter
1 x CI920 Communication interface
1 x DX910 Digital I/O module
If required, a 230 V AC / 24 V DC power supply unit must be provided by the
customer to ensure 24 V DC power supply of the I/O System S900.
Requirements on PLC / OCS master systems
The I/O System S900 is designed for connection to all systems with a
PROFIBUS DP master.
The PROFIBUS DP (V0) services provide the following functionality:
• Configuring/setting parameters of the S900 station upon re-start
• S900 diagnostic messages
• Reading HART secondary variables from connected field devices
• Reading HART diagnostics from connected field devices through
PROFIBUS diagnostic messages.
To be able to use the full range of functions provided by the I/O System S900,
the master should support additional functions. Modern, state of the art master
systems support PROFIBUS DP V1 services and are capable of loading
configuration data and parameter settings while the system is running and
without affecting the slaves or requiring a network restart.
PROFIBUS DP V1 services allow you to:
• monitor the input and output data
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