Specifications

8 – Configuring Points
150 R400
Target Input State Associations
Target input state associations are the PV input states that correspond to the
output states you wish to use in controlling this point. See the Quick Builder
online help for an explanation of descriptor values and their use.
Pulse Width
Pulsing is an action that can be performed by the server: if the server switches an
output ON, a pulse width later the server can switch the output OFF.
The default is to disable pulsing.
Control Timeout for Status Points
Use this field to specify the maximum allowable time for the PV of the point to
reach the target state for the OP action, before a PV FAIL alarm is generated.
For example, if a pump has just been serviced and an operator has used a Station
display to set the pump to the ON state, the server then needs to read the
controller to determine whether the pump is in fact ON or OFF. If the ON state is
not achieved after the control timeout period, an alarm is raised to indicate that
the control has failed.
To configure the generation of control timeout alarms for status point outputs or
modes, as described in the previous examples, you must:
• Specify the target input states for the point.
• Enable the control failure alarm option (as described in “Alarm Properties
for Status Points” on page 156).
Disable Mode Checking On Output
If mode control at a point is disabled, the mode of the point is ignored by the
server (for example, even if the point mode is AUTO, the operator will still be
able to perform point control).
Normally, the server checks the mode of the point before it allows an operator to
change the OP for that point. In some circumstances (for example, you might not
want to implement modes at that point), you might want to disable the routine
mode-checks by the server.
plscpcg.book Page 150 Monday, May 28, 2001 10:11 AM