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. With the IQ and IQT actuator some of the parameters can be altered by
using the infra-red communications link 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.
The parameters that may be set by the GSD exchange or V1 comms are:
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