Keeping the World Flowing
39
7 Parameters
7.1 Parameters set by GSD and DP-V1 Communication
Profibus defines a power on reset sequence for all devices as:
Diagnostic Request
Set Parameterisation
Check Configuration / Set Configuration
Diagnostic Request
Data Exchange
After a successful Diagnostic Request the Set
Parameterisation Telegram is sent from the PLC. The Set
Parameter message contains the user defined Parameter
Data Unit (DU) of a minimum of 7 bytes, max 244 bytes.
The first 7 bytes are mandatory and fixed. The following
bytes contain the parameter values to be set and these are
derived from the GSD file and the values in it. The response
is a short acknowledgement (E5) with no data field if the
Parameterisation is accepted.
The Profibus DP Module (Mk2) GSD contains 19 configurable
parameter registers sent in a 23 byte string. The first 3 bytes
are Profibus Specific, the next 19 relate to the configurable
parameters and the 23
rd
is reserved for future use. Some of
the parameters can be altered by using the Accent software
and the setting tool. All of them can be altered by the values
in the GSD file or by a V1 communication tool such as PDM or
FDT when the appropriate files are provided. It is possible to
lock out parameterisation by GSD in the more sophisticated
uses of this card. This facility is there to ensure that V1, FDT or
PDM parameterisation is not lost on a power cycle.
Care must be exercised with access to these parameter
registers as they can alter the complete performance of the
actuator. This section of the manual describes each variable
parameter and should be used for reference when using the
parameterisation tools.
Profibus DP Communication
A4 US
US
A4
US
A4
A4 US
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