Function Block Properties dialog box - Configure tab (D2SD)

The Discrete 2-State Device (D2SD) instruction controls a discrete device which has only two possible states (e.g., on/off, open/closed, etc).
Use the
Configure
 tab to set the parameter values for the selected (D2SD) function block.
The following table describes the parameters available on the
Configure
 tab:
Parameter
Description
Feedback States
Click one or more of the four buttons to configure the state of the feedback (FB0 or FB1) when the device is in a 0 or 1 state. The options are:
  • Feedback 0 State 0
  • Feedback 0 State 1
  • Feedback 1 State 0
  • Feedback 1 State 1
Output Reverse
Select this check box to reverse the default output state.
Fault
  • Time
Enter the value (in seconds) of the time to allow the device to reach a newly commanded state.
Setting a Fault Time of zero disables the fault timer.
If you enter an invalid value, the instruction will assume a value of zero and set a unique bit in Status.
  • Latch alarm
Select this check box to latch the fault alarm.
Override
  • Override State
Used to configure the state of the device when the device is in Override mode.
A value of 0 indicates that the device should go to the FALSE, or 0, state.
A value of 1 indicates that the device should go to the TRUE, or 1, state.
  • Override on initialize
Select this check box to set the 2-State Device to Operator control.
If this box is not selected, the 2-State Device will execute normally.
  • Override on fault alarm
Select this check box if you want the device to go to Override mode and enter an Override state on a fault alarm. After the fault alarm is removed, the device will be placed in Operator mode.
Program value reset
Select this check box to reset the program control values.
Status
Displays read-only status information for blocks containing status bits. If none of the status bits are set, an OK message appears in this field. Otherwise, a list of the status bits that are set appears here. This list is comprised of the parameter names associated with the status bits, and typically explain which parameters were configured with invalid values.
Execution Order Number
Displays the block's execution number if the routine is in a verified state. If the routine is not yet verified, a
Routine not verified
 message displays. Note that this item is read-only.
Never display description in a routine
Select this check box if you do not want the description to display in the routine.
OK
Click this button to add the selected item in the instruction list to the routine and close the Fun
ction Block Properties
 dialog box.
Cancel
Click this button to cancel any edits you have made and close the
Function Block Properties
 dialog box.
Apply
Click this button to accept your changes and continue editing in the
Function Block Properties
 dialog box.
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