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OPERATION
D397-51-880 Issue E
4.6.1 Parameterisation
Parameterisation is used for control values which are only to be changed occasionally. These values are only
transmitted at the start of data exchange. The only value used as a parameter in these units is speed setpoint. This
is included with module18. See Section 4.7.18 for details. If module18 is not selected as part of the data exchange
configuration the existing value of speed setpoint will be used, as this is retained following a power down.
4.6.2 Configuration
During configuration the user can define what modules are required and in which order the data is transferred. The
unit simply adds the input and output data bytes to the message maps in the order that they are defined in the
configuration message.
Example:
Module = Mod_A 3 bytes in (Ai1, Ai2, Ai3), 1 byte out (Ao1)
Module = Mod_B 2 bytes in (Bi1, Bi2), 2 bytes out (Bo1, Bo2)
A) Configure Mod_A, Mod_B gives
Output map: -
Input map:-
B) Configure Mod_B, Mod_A gives
Output map:-
Input map:-
Data is always referred to the Master so output is Control data from Master to Slave and Input data is feedback from
Slave to Master. There are many software modules and many bytes of data. Care must be taken in correctly selecting
and aligning the data into the system.
4.6.3 Configuration failure
Most of the software modules can be configured with most of the turbo pump control units but there are some
exceptions. Which SCU’s can be used with which Profibus software modules is shown in Section 4.7.
If one of these modules is inappropriately configured the unit will not enter data exchange. Instead the number of
the first failed module will be placed in the extended diagnostics. Additionally the unit’s front panel error LED (red)
will be illuminated.
Byte1 Byte2 Byte3
Ao1 Bo1 B02
Byte1 Byte2 Byte3 Byte4 Byte5
Ai1 Ai2 Ai3 Bi1 Bi2
Byte1 Byte2 Byte3
Bo1 Bo2 Ao1
Byte1 Byte2 Byte3 Byte4 Byte5
Bi1 Bi2 Ai1 Ai2 Ai3
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