ProSoft Technology 5104-DNPS-PDPM - Manual (Page 9)

PDPM ♦ ProLinx Gateway Functional Overview
PROFIBUS DP Master Protocol Manual
ProSoft Technology, Inc. Page 9 of 70
June 24, 2013
2.4 Master/Slave Communication Phases
The communication between the Master and the slaves takes place in the
following phases:
 Parameterization and configuration phase
 Usable data transfer phase
Before a DP slave can be integrated into the usable data transfer phase, the
parameterization and configuration phase runs a device identification test that
verifies that the planned configuration matches the actual device configuration for
each slave in the PROFIBUS network. The test verifies that:
 The device is actually there
 It is the right type of device
 The station address set on the device matches the station address in the bus
configuration
 The formats, telegram length information, and bus parameters are correct
and
 The number of configured inputs and outputs is correct
2.5 Module Internal Database
The internal database is central to the functionality of the module. This database
is shared between all the ports on the module and is used as a conduit to pass
information from one device on one network to one or more devices on another
network. This permits data from devices on one communication port/network to
be viewed and controlled by devices on another port/network. In addition to data
from the master port, status and error information generated by the module can
also be mapped into the internal database.
Input
Image
Data
Other
ProLinx
Protocol
Driver
0
ProLinx
Communication
Gateways
Internal
Database
Output
Image
Data
PROFIBUS
Master
Status &
User Data
Register range
255
556
555
300
3999
PROFIBUS
Master
Driver