Festo SPC200 Series, Manual

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FREEZE and SYNC
The SPC200 supports the PROFIBUS control com-
mands Sync and Freeze. If a PROFIBUS master sends
these control commands, the internal I/Os of the field
bus module used for communication (I10.0...I13.15 or
Q10.0....Q13.15) are treated as follows:
CAUTION
In the following cases the FREEZE or SYNC mode
will be automatically reset:
•
when the SPC200 is switched on/off or after a
system reset
•
when a project is loaded with WinPISA
•
when the the field bus master is stopped
The FREEZE mode will also be automatically reset
in the following case:
•
when the bus connection to the SPC200 is
interrupted (response monitoring active).
The internal outputs of the field bus module are
mapped on inputs of the master. With this control com-
mand the internal outputs of the field bus module
(Q10.0...Q10.15)can be ”frozen.” The field bus module
then sends a constant output image to the master. The
following FREEZE command causes the output image
to be updated. The updated output image is then sent
constantly to the master again. FREEZE
Return to normal operation: UNFREEZE command.
4. Commissioning
4-18
SPC200-COM-PDP 9904NH