Festo 174335, Electronic Manual

Page: 82 / 184

4. Commissioning
4-16
Festo P.BE-VIFB13-03-EN en 0003c
Caution
In the following cases, the FREEZE or SYNC mode will be
automatically reset:
– Switching the valve terminal on/off
– Stopping the field bus module
The FREEZE mode will also be reset automatically in the
following case:
– Bus connection to the valve terminal interrupted (re-
sponse monitoring active).
FREEZE
With this function all the inputs of the valve terminal can be
“frozen”. The valve terminal then sends a constant input
image of all the inputs to the master. The following FREEZE
command updates the input image. The updated input image
is then sent constantly to the master.
Return to normal operation with the command UNFREEZE.
SYNC
With this function all the outputs of the valve terminal can be
“frozen”. The valve terminal then no longer reacts to modifi-
cations to the output image in the master. The following
FREEZE command accepts the updated output image of the
master.
Return to normal operation with the command UNSYNC.