Sync And Freeze; Sync And Freeze Overview; Sync And Freeze Status - Lenze AC Tech MotionView OnBoard PositionServo PROFIBUS-DP Reference Manual

8.5 Sync and Freeze
8.5.1 Sync and Freeze Overview
The network master can put cyclic data into groups which allows multiple cyclic channels to be suspended
and updated using the SYNC and FREEZE commands.
The SYNC Command:
• Controls data to the drive. (Dout)
• The SYNC command will cause a single transfer of the previously grouped data and stop any more data
from being received by the drive.
• The SYNC command may be repeated while in this state to allow another single transfer of data to the
drive.
• Issuing an UNSYNC command will revert the drive to a continuous cyclic update of the received data.
The FREEZE Command:
• Controls data from the drive. (Din)
• The FREEZE command will cause a single update of the previously grouped Din data. In the next data
cycle, the drive transfers "frozen" data to the master.
• The Din data will not be updated until the next FREEZE command is received (next "snapshot" taken)
or the FREEZE mode is cancelled by an UNFREEZE command.
• Issuing an UNFREEZE command will revert the drive to a continuous cyclic update of the transmitted
data.
8.5.2 Sync and Freeze Status
All devices that support SYNC and FREEZE provide an 8-bit status word. The SYNC and FREEZE status word
is available as part of the PROFIBUS status word. The function of the 8-BITS is described in Table 15.
P94PFB01A
Advanced Features
Table 15: SYNC and FREEZE Status
PID408 Value
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
Bit 13
Bit 14
Bit 15
Description
Reserved
Clear Out Data
Unfreeze
Freeze
Unsync
Sync
Reserved
Reserved
28