Displaying Data In Profibus-Dp; Parameterization - Siemens 3VF Series Communications Manual

Communication System Manual

4.5.6 Displaying data in PROFIBUS-DP

Any standard PROFIBUS-DP master can exchange data with the interface module. Even very "simple"
master interfaces can be used thanks to the data structure.
Standard PROFIBUS-DP masters and slaves transmit and process four different types of message:
•
Parameterization message
•
Configuration message
•
Diagnostic message
•
Data message
The general mode of operation of the communication link is described in the following:
•
After the master has determined which slaves are present on the bus, it sends first a
parameterization message and then a configuration message to each slave. After the slave
(interface module) has received the parameterization and configuration messages, master and
slave can start the data exchange cycle (= normal operating state).
•
If diagnostic data or faults occur in the DP slave (interface module), e.g. "3WN1/3WS1
communication interface not clear", the slave (interface module) transmits a high-priority message
instead of a low-priority message. The master recognizes this and requests the diagnostic data
from the slave for the purposes of a more detailed analysis.
Note Type or GSD files
All the data (see Parameterization, Configuration) required by the interface
!
module for normal operation are available in the form of a type or GSD file,
which you will find on the supplied diskette.
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The following section describes the four message types in detail.

4.5.6.1 Parameterization

The master identifies itself to the slave by means of the parameterization message and defines the mode in
which the slave (interface module) is to operate.
The following parameterization options are available as standard:
• Slave operation with/without watchdog (response monitoring). This is necessary for safety reasons as it
makes it possible to detect whether a master is still active.
• Definition of TSDR (the minimum delay time which must elapse before a slave can respond)
• Operation of slave in Freeze/Sync mode (e.g. for actuators, counters)
• Enabling/disabling of DP slave for other masters.
• Issuing of a group assignment for "global control" messages. Each bit signifies a group.
• Master address for unique identification
• User-specific parameters (e.g. response to CLEAR master status)
Version 1.0 (02/98)
No further data need to be entered by the user.
© Copyright Siemens AG 1998. All rights reserved.
3WN1, 3WS1 Circuit-Breakers
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