Input and Output Signals
Publication
PUB091-004-00_0918
35 of 64
Digital Input DI-2
This bit reports the status of the contact connected to the actuator
hard wired
Close
terminals. The input can be used to control the
actuator or simply to report the status of a plant feedback signal. The
function is set in the Auxiliary Input Mask parameter which determines
whether the bit is reported as true (1) for a closed contact or an open
contact and whether the input controls the actuator or not. Note that
the input is always reported, even when it is also controlling the
actuator.
Digital Input DI-3
This bit reports the status of the contact connected to the actuator
hard wired
Stop/Maintain
terminals. The input can be used to control
the actuator or simply to report the status of a plant feedback signal.
The function is set in the Auxiliary Input Mask parameter which
determines whether the bit is reported as true (1) for a closed contact
or an open contact and whether the input controls the actuator or not.
Note that the input is always reported, even when it is also controlling
the actuator.
Digital Input DI-4
This bit reports the status of the contact connected to the actuator
hard wired
ESD
terminals. The input can be used to control the
actuator or simply to report the status of a plant feedback signal. The
function is set in the Auxiliary Input Mask parameter which determines
whether the bit is reported as true (1) for a closed contact or an open
contact and whether the input controls the actuator or not. Note that
the input is always reported, even when it is also controlling the
actuator.
A configuration feature also allows DI-
4 to be set to act as a ‘Disable
Fieldbus Control’ input. In this mode, when the input is made
(irrespective of the Auxiliary Mask setting), the actuator cannot be
controlled over the network. This can be useful during plant
commissioning to prevent unwanted valve movement.
Control Contention
This bit will be true (1) if there is more than one actuator control bit
active. For example, if more than one of coils 0, 1, 2, 3 or 8 have a
value of 1.
Partial Stroke in Progress
When the actuator is performing a partial stroke this bit is true (1).
Once the action is complete the bit is reset (0). If the partial stroke is
interrupted by a new command then the bit will be reset.
Partial Stroke Error
In order to perform a partial stroke of the valve, the starting
position is specified as either the open limit or the close limit. If the
actuator is commanded to perform a partial stroke when it is not in the
correct starting position or when it is in a mid-position this error is
generated and the bit will be set (1).
There is a timer associated with Partial Stroke that is set during
parameterisation to a value long enough to cover a successful partial
stroke operation from end to mid position and back to the end. If the
