Operating modes of the BC bus coupler
PCD0
26/766 E2
(HB_PCD0 26 766_E2.DOC)
SAIA-Burgess Controls Ltd.
Page 129
8
Operating modes of the BC bus coupler
8.1
Overview of operating modes
Operating modes
Description
Bus interface running, I/Os are refreshed, active LOCK and TRIGGER conditions are
analyzed. You can display the control states of individual I/O channels on the bus
coupler.
You can use this mode to set the control status of individual I/O channels. FORCE
overrides the I/O control states and the lock definitions.
After a trigger event the I/O map will be saved with a memory depth of 20. The trigger
event is an I/O status change that can be defined.
Like FORCE but used to permanently set the control status of individual I/O
channels. The LOCK definition will be stored permanently in the bus coupler.
RUN mode is interrupted. I/O refresh is switched off. The unit is set to a preferred
shut-off state (see diagnosis code 5).
RUN mode is active after the bus coupler has been switched on.
The FORCE, TRIGGER, LOCK modes can be activated during RUN
mode. The RUN mode will not be interrupted.
FORCE and LOCK directly influence the control states of I/O
channels. Beware of dangerous operating states in the controlled
processes!
Take appropriate measures to prevent invalid operating states.
Setting operating modes
The bus coupler is protected from unauthorized operation by a user
lock-out.
To select an operating mode the user lock-out must be deactivated.
See User lock-out of the BC bus coupler on page 127
Press the Mode key to move
the flashing LED from one
mode to the next.
Press OK to confirm the
selected mode.