Rockwell Automation AADvance Controller Demo Unit - Manual (Page 37)

Document: 553850 Issue 1.2: March 2011 4-3
Configure the Top-level Process Safety Time (PST)
The PST setting defines the maximum time that the processor will allow the outputs
to remain in the ON state in the event of certain internal diagnostic faults or
systematic application faults. If PST expires the system will go to its safe state.
You have to specify the PST for the whole controller. This is a top level setting, which
you make once for all the T9110 processor modules.
Note: Groups of I/O modules can inherit this setting, or use individual PST settings
instead.
To set the top-level process safety time do the following:
1) Select the 9110 Processor in the Equipment tree view.

The 9110 Module Editor opens.
2) Select the 9110 tab.
3) Enter the time into the Process Safety Time field. Choose from the following
range of values:

Minimum: 20ms

Maximum: 65,535ms (65 seconds)
Note: If you specify a process safety time below the application execution time,
the application will not run. The default is 2,500ms.
4) Click Apply.
Set PST to its Default Value
You can reset the PST to its default value, do the following:
1) Select the 9110 Processor in the Equipment tree view.

The 9110 Module Editor opens.
2) Select the 9110 tab.
3) Clear the entry in the Process Safety Time field.
4) Press return.

The Process Safety Time will change to its default value.