Module Properties Dialog Box - Limits Tab Overview (1756-OF6CI, -OF6VI)
Use this tab to configure output limits on the 1756-OF6CI and 1756-OF6VI modules.
Use the
Limits
tab to:- Select the channel to configure
- Enter clamp limits
- Enable ramping during Run mode
- Enable or disable all alarms
- Maintain the high and low limit alarms even after the condition ceases
- Maintain the ramp rate alarm even after the condition ceases
TIP:
The module’s configuration information is stored in the
controller and the controller configures the module.
Parameters
Channel
Select one of the channel buttons to display its information on the alarm configuration
tab.
Limits
Enter Limit values for:
- High Clamp- the highest value an output channel will be allowed to reach in the control process
- Low Clamp- the lowest value an output channel will be allowed to reach in the control process
Ramp in Run Mode
Select this box to enable ramping during Run mode. Ramping occurs between the current
output level and any new output value received. The output will only be allowed to
change at the configured ramp rate limit every 35 milliseconds.
Ramp Rate
Enter the maximum rate of change an output may make in Engineering Units/second. Also
serves as a trigger point for a Ramp Rate Limit alarm when the Ramp in Run mode is
selected. You can also use the Ramp Rate Limit for ramping to a user-defined value in
Program or Fault mode. A non-editable copy of the Ramp Rate is shown on the Output State
Tab.
Disable All Alarms
Select this box to disable alarms for the current channel. If checked, all alarm entries
beneath this check box are disabled.
The High Clamp and Low Clamp Alarms (see above) are disabled also, but the actual limits
themselves are still effective and thus shown above the disable check box.
Latch Limit Alarms
Select this box to maintain the high and low limit alarms even after the condition
ceases. The high and low limit alarms are set if the requested output level is beyond
either limit (> High or <Low).
Latch Rate Alarm
Select this box to maintain the rate alarm even after the condition ceases. The ramp rate
alarm is set if there is a minimum change of input between samples of a channel.
Unlatch
Select this button to unlatch the adjacent alarm condition. Select Unlatch All to unlatch
all alarms for the channel.
Slider Bar
Use this bar to visualize where the process limit trigger values are set for your
process. You can also drag the process alarm flags to adjust the trigger points.
TIP:
To change the trigger points by whole numbers only, hold
down the shift key while dragging the marker on the slider bar.
OK
Select this button to accept your edits on any tab and close the dialog.
Cancel
Select this button to cancel your edits on any tab and close the dialog.
Apply
Select this button to apply your edits on any tab and continue editing.
If:
- You are online in Program, Remote Program or Remote Run mode and,
- This controller is the owner controller and,
- You have changed the module’s configuration in the software,
when you select the Apply or the OK button, the information is automatically sent to the
controller. The controller tries to send the information to the module (if the module’s
connection is not inhibited). If you don’t select Apply, your changes are not sent to
the controller.
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