Danfoss VLT Midi Drive FC 280 Programming Manual page 24

Control PROFIBUS DP
4.6.2 Freeze/Unfreeze
Freeze/unfreeze can be used for simultaneous reading of
process data, for example output current, from several
slaves.
A freeze command freezes the actual values and upon
request the slave sends back the value that was present
4 4
when the freeze command was received.
At the receipt of an unfreeze command, the values once
again are continuously updated and the slave returns a
present value, for example a value generated by current
conditions.
The values are updated when a new freeze or unfreeze
command is received.
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