Lenze 2130IB - Manual (Page 47)

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3.1.6. DP command Sync/Unsync
The Sync command is used to 'freeze' the controller process input data.
This means that the controller works with those process data which it has
used during receipt of the Sync command. The controller receives new
data from the master, but it does not use them. Therefore, the master
can load process data in the controller and activate them simultaneously
using a Sync command to one or several drives.
A Sync command can be sent several times. The Unsync command
cancels the Sync command.
Caution! This function also causes the DP parameter setting
channel to be inactive.
3.1.7. DP command Clear_Data
The Clear_Data command is used to the set controller process input data
to 0.
Caution! This function also makes the DP parameter setting
channel inactive.