The Enhanced Device Control function block supports two modes:
- Automatic (Auto)
- Cascade (CAS)
Mode transitions are standard. The mode of the device is specified
through the MODE parameter.
The actual mode changes to Local Override (LO) in the following
instances:
- when TRK_IN_D is True
- when SHUTDOWN_D is True
- when the interlock is lost
(the
Interlock device option is selected and INTERLOCK_D is False)
- when there is no permit
(the
Permissive device option or the
Permissive to Any State device option is selected and
PERMISSIVE_D is False) and the device state is Confirmed State
n, where
n is the state number corresponding to the passive state for the
Permissive device option and can be any state for the
Permissive to Any State device option.
When OPERATION_STATE is Locked, the mode is kept in Local Override.