Bus Parameters - Omron C200HW-PRM21 Operation Manuals

Operation

4-3-7 Bus parameters

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The menu item 'Settings – Bus parameters' leads to a dialog box where the
overall PROFIBUS-DP communication parameters can be set. In most cases,
only the baud rate will need to be set to the required value. This can be done
in the following panel:
The configurator will verify that the selected baud rate is supported by all
devices connected to the master, and issue a warning if this is not the case.
'Optimize = standard' will automatically adjust all bus parameter settings to a
value derived from the data found in the slaves' GSD files, and the selected
baud rate. These values can be viewed by clicking the 'Edit...' button.
Only in extreme cases it may be required to adjust these settings, i.e. with
exceptionally large configurations (>80 slaves), or when using a large number
of repeaters or signal converters.
For manual adjustment of bus parameters, select 'Optimize = by user' and
click 'Edit...'.
It is highly recommended to access the bus parameter panel after all slaves
Caution
have been configured. By changing the baud rate, all timing parameters will
be optimised for the number and types of defined slaves. If the configuration
is subsequently modified, select the chosen baud rate again to re-activate the
parameter optimisation. If any bus parameter is modified manually, no
automatic recalculation will take place until the baud rate is changed.
Baud rate Sets the communication speed for the master and all
slaves which support auto baud rate detection. All
standardised PROFIBUS-DP values from 9.6 kbit/s to 12
Mbit/s are supported by the C200HW-PRM21. A change
of baud rate will recalculate all parameters to a value
optimised for the actual configuration at the new baud
rate.
Section 4-3