Working with XtraDrive-DP
C
HAPTER
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Last printed: 6/1/03 4:21 PM
Ch3WorkingWith.doc
Last saved: 6/1/03 4:16 PM
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Starting Program
Synchronization
XtraDrive-DP is designed to enable the synchronization of the start
of programs on a group of drives, within a maximum time gap of
125
µ
sec. To enable this functionality, use the PROFIBUS SYNC
command.
SYNC is a PROFIBUS control command, which is sent (broadcast)
to multiple slaves simultaneously. After the slaves receive the
SYNC command from the master, output is frozen in its current
state and new outputs are not sent to XtraDrive-DP until the next
SYNC command.
Start program synchronization includes the following steps:
✦
You add to program the WAIT_TO_START command, before
first movement command.
✦
During data exchange, the master sends a RUN < label >
command to each XtraDrive.
✦
The program runs until the first movement is ready to be
executed (location in MCB - Motion Command Buffer).
✦
The master checks if the status word’s 8th bit (Ready for Start) is
set to 1 in each drive.
✦
The master sends a SYNC command to the group of XtraDrives.
✦
During data exchange, the master sends a START command to
each XtraDrive.
✦
(Mode - broadcast). The command will not execute until the
next SYNC command.
✦
The master sends a second SYNC command to the group of
XtraDrives.
AUDIN - 7 bis rue de Tinqueux - 51100 Reims - France
Tel : 03.26.04.20.21 - Fax : 03.26.04.28.20
Web : http: www.audin.fr - Email : [email protected]