SIS function block parameters have characteristics that determine access and Non-Volatile Memory (NVM) behavior. Characteristics depend on the CSLS revision. Access characteristics determine how and when the parameter values can be written. NVM characteristics determine how the values are restored after a download or power failure. The characteristics of a block are not configurable. The parameter table for each function block lists the characteristics of each parameter.
For CSLS major revision 2, you must select the Enhanced access control for function block parameters check box on the CSLS Properties (Security tab) dialog to obtain certain characteristics. If you clear the check box, the CSLS only supports characteristics listed for CSLS major revision 1.
Configurable — These parameters can be given values during configuration.
Tuning — These parameters can be changed by an operator online. If enhanced access control functionality is enabled, these parameters can only be changed online when the logic solver is Unlocked. These parameters are not writeable from an LSCALC regardless of the state of the logic solver. Only CSLS major revision 2 supports enhanced access control functionality.
Operating — These parameters are writeable at all times, regardless of the state of the logic solver.
Preserved on Download — The Logic Solver supports total downloads only. When a Logic Solver is downloaded these parameters are copied from the existing block into the newly downloaded block to provide matching, rather than initializing, behavior following a download.
Restored on Restart — The current parameter value is stored in non-volatile memory (NVM). After a restart, the values for these parameters are restored from non-volatile memory.
|
Logic Solver Type |
Scenario |
Behavior |
|---|---|---|
|
CSLS |
The logic solver is removed and installed in a different carrier. |
Restored on Restart behavior does not occur. The configuration must be downloaded to the logic solver to continue processing. |
|
CSLS |
The logic solver is removed and installed in the same carrier. |
The Restored on Restart behavior does occur. |
|
CSLS |
The logic solver is powered off. |
The logic solver resumes processing after power is restored whether or not the associated SZ controller has been downloaded. However, to establish communication with the CSLS, the SIS controller must be downloaded either manually or through the cold restart function. |
|
SLS 1508 |
The logic solver is removed and then installed in a different slot. |
Restored on Restart behavior does not occur. The configuration must be downloaded to the logic solver to continue processing. |
|
SLS 1508 |
The logic solver is powered off and is removed and then installed in the same slot. |
The logic solver resumes processing after power is restored provided that the associated DeltaV controller remains configured and powered up. |
|
SLS 1508 |
The logic solver remains powered on and is removed and then installed in the same slot. |
The Restored on Restart behavior does not occur. The configuration must be downloaded to the logic solver to continue processing. |
|
SLS 1508 |
The logic solver is powered off. |
The logic solver resumes processing after power is restored provided that the associated DeltaV controller is downloaded either manually or through the cold restart function. |
Restored on Restart parameters are not restored if they are wired to (written to).
SIS function block parameters are similar to DeltaV function block parameters in several ways. Refer to the DeltaV function block parameter documentation for information on the following topics: