User manual

905U-G Wireless Gateway User Manual
Page 85 ©September 2004
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 is 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.
Depending on the particular slave, Manufacturer Specific Data may also apply to an I/O
module. This data is a string of hexadecimal bytes, the meanings of which (if applicable) are
device specific and should be detailed in the documentation for the particular device.
Master Properties
The profibus master 905G has some configurable properties that affect the entire profibus
network. These properties can be accessed by double clicking the master icon in the network
busview, or right-clicking the icon and choosing properties.
Profibus Tab
The Address parameter specifies the actual profibus address of the profibus master (default =
0). Only available addresses are listed and can be selected as new address. The serial baud
rate for the entire profibus network is selected – this is the baud rate that will be used by the
master and therefore must also be supported by all slave devices on the network. Most slaves
will support auto baud rate detect, but it should be ensured that any slave on the network
supports the configured baud rate.
The Profile parameter controls the assignment of Bus Parameters for the profibus network.
In the single master
(default) profile, the bus
parameters are calculated
automatically by
configuration software
and are optimised for
speed – no other masters
may be connected to the
network. The User
Defined profile allows the
bus parameters to be
manually configured for
special network
configurations and should
only be used if the user is
familiar with the
individual profibus