Control Operation Parameters

Control parameters that are set automatically are:

• Control Number (ctlNum)—this is a numeric identifier for the control request and can be used by the client to distinguish between the different control requests. This is set to the last two digits of the request ID sent by Geo SCADA Expert to the IEC 61850 driver.

  Origin Identifier (orIdent)—this is the identifier for the originator of the control request. It is set by the driver to be the Server Label of the parent database.

• Origin Category (orCat)—this is the category of the originator of the control request. For example: if it is local or remote control. It is set by the driver to be category 3 (remote control).

Control parameters that can be set manually in the control object are:

• Test—this is a true or false flag to indicate to the device whether the control request is sent for test purposes or not.

• Check—this consists of 2 separate check values, the interlock check and the synchro check. These 2 values are true or false flags to enable or disable the corresponding operational checks when operating the control.

Other important parameters are listed below:

• Control Model (ctlModel)—this is the most important parameter as it describes what type of control the control object supports, direct control with normal security or select before operate with enhanced security, for example.

• Control Value (ctlVal)—is the parameter that is set by the control method that is the requested value for the control.

• Status Value (stVal)—this is the actual output of the control object. It is read only.

Depending on the control model of the data object, there may also be a few additional parameters:

• Select Before Operate Class (sboClass)—this further defines the behavior of the of control object during the control operation and allows the device to keep the control object selected and ready for multiple operations or not.

• Select Before Operate Timeout (sboTimeout)—this is the timeout in milliseconds between selecting the control and operating the control which if expires will deselect the control.