Rockwell Automation 193-EPRB Profibus Side Mount Module for the E1 Plus Overload Relay User Manual - Manual (Page 15)

1 Publication 193-UM010A-EN-P – January 2008
Chapter
3
PROFIBUS Configuration
Introduction The PROFIBUS Module supports DP-V0 and DP-V1 communications. It is commissioned for
a PROFIBUS network using a GSD file which contains information about parameters, profiles,
I/O types, and sizes specific for this module. The GSD file for the 193-EPRB can be
dowloaded from http://www.ab.com/networks/gsd/.
Acyclic Parameter Access (DP-V1)
The preferred way of accessing device parameters is by means of Acyclic (DP-V1) read- and
write services. When accessed acyclically, parameters are addressed by their corresponding
Index (index equals parameter number). Note that due to technical reasons imposed by the
PROFIBUS networking system, it is required to map at least one byte of Cyclic I/O in either
direction. Any parameter can be used for this purpose.
Note: The slot number is not significant (i.e. it’s ignored by the module)
Cyclic Parameter Access (DP-V0)
All parameters can be accessed cyclically by adding the corresponding GSD-module to the
network configuration. GSD-modules can be added (i.e. mapped as Cyclic I/O) as needed, in
any order, with a few restrictions:
• At least one byte must be mapped as Cyclic I/O. This can either be device parameters -
or - the Control- and Status Registers.
• It is not permitted to map the same parameter to the Cyclic I/O configuration more
than once.
• Parameters mapped as Cyclic I/O cannot be written using Acyclic (DP-V1) services.
IMPORTANT
Write requests towards writeable parameters will automatically cause the
corresponding setting to be saved in non volatile memory. For
consistency reasons, all parameters mapped as Cyclic I/O will be
read-only when accessed acyclically.
IMPORTANT
Changes made to parameter values will take effect immediately even
during a “running” status.
IMPORTANT
Parameter setting changes made in a PROFIBUS configuration tool do
not take effect in the PROFIBUS Module until the installer applies or
downloads the new settings to the device.
IMPORTANT
For technical reasons, writeable parameters mapped as Cyclic I/O will
not be saved automatically in non volatile memory. To save such
paramaters, a save operation must explicitly be triggered by means of a
bit in the Control Register.