User manual

Chapter 4 Configuration
Page 89 ©February 2009
When an I/O module is added to a slave, configuration software will automatically assign that
I/O to the next available space in the fieldbus interface. The input and output addresses that are
assigned here will correspond to the locations that must be transferred via fieldbus mappings in
order to make the I/O available to the radio network. The input and/or output address assigned
by software for a given I/O module can be altered by double clicking on that I/O module entry in
the slave listview (see above).
The start address in the fieldbus interface for the inputs or outputs can be altered in the
corresponding Start field as shown above. Since the 105G provides for up to 2048 bytes of
inputs and 2048 bytes of outputs, the possible range for inputs or outputs is 0 – 2047.
I/O modules may also have associated user parameter data defined by the corresponding GSD
file. The meaning of these parameters (if applicable) is specific to the slave implementation, and
may be altered via the Parameter Assignment tab of the Module Properties form.
Configuration software also provides an additional I/O module to all slaves that are not defined
in the GSD files, which is the Universal Module. The universal module allows the input/output
length, unit, and consistency to be assigned custom values as required – however not all slave
implementations will support this feature (consult the specific slave documentation for details).
The Length parameter defines the length of the input or output module in either bytes or words
(according to the corresponding Unit parameter). The data consistency over the Profibus network
may be applied to the selected unit (i.e. byte or word) or to the total length of the input or output
selection.