Fieldbus system
BC9000 and BC910056 Version: 4.0.0
Port number
The port number distinguishes sub-elements in the connected device.
Port 100: register access
Port 300: fieldbus process data
Port 800: local process data (BC90x0, C900 only)
Index group
The index group distinguishes different data within a port.
Index offset
Indicates the offset, from which reading or writing the byte is to start.
Len
Gives the length of the data, in bytes, that is to be read or written.
TCP port number
The TCP port number for the ADS protocol is 48898 or 0xBF02.
7.4.3 ADS services
7.4.3.1 ADS services
User data of an ADS telegram
The maximum size of the user data in an ADS telegram is 1900 bytes.
Process data port 300
The fieldbus data is accessed via ADS port number 300. The data is monitored by a watchdog. If no further
telegram arrives within 1000 ms the outputs will be switched to the safe state.
Index group Meaning Index offset (value range)
0xF020 Inputs 0...511
0xF030 Outputs 0...511
Local process image port 800 (BC9000, C900 only)
Data can be read from and written to the local process image. If it is necessary for outputs to be written, it is
important to ensure that they are not used by the local PLC, because the local controller will overwrite these
values. The data are not associated with a watchdog, and therefore must not be used for outputs that would
have to be switched off in the event of a fault.
Index group Meaning Index offset (value range)
0xF020 Inputs 0...511
0xF030 Outputs 0...511
0x4020 Flags (BC 9000, C900 only) 0...4096
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