Specifications

8 – Configuring Points
152 R400
This check is performed every 10 seconds (from when the control is performed)
until good control has been achieved or the control timeout period has elapsed
(whichever happens first).
Control Timeout for Analog Points
Use the Control Timeout field to specify the maximum allowable time for the
PV of the point to reach the value within the control deadband of the new SP and
within the specified timeout period, before a “PV fail” alarm is generated.
If a “control timeout” is configured and an analog point’s SP or a status point’s OP
is controlled, the server scans the point’s PV every ten seconds. The server keeps
scanning every ten seconds until the values agree or until the control timeout
value elapses.
For details of how you configure the generation of a control fail alarm, see
“Alarm Properties for Analog Points” on page 158.
Control Confirmation
When an operator performs a control action on a point for which control
confirmation has been specified, a prompt is displayed to the operator to “Please
confirm control request.” The operator must then enter a y in response before the
control action is carried out or n to abort the command.
Figure 8.12 How Control Deadbands Work
+ Deadband
- Deadband
T
PV
If T> control timeout
then generate PV Fail alarm
Time
0%
SP
100%
plscpcg.book Page 152 Monday, May 28, 2001 10:11 AM