The configuration of Sampled Values, or more precisely Sampled Value Blocks, is done on the SCL element SampledValueControl, its referenced DataSet element, and its referenced SMV element allocated in the Communication section. The schema restricts the allocation of the element in the following way:

1. SampledValueControl must reside in the LN0 element.
2. SampledValueControl and its referenced DataSet must have the same parent.
3. SMV can only exist if the access point (ConnectedAP) of the server is connected to a sub-network (SubNetwork) in the Communication section.

Editing Sampled Values

In OpenSCD, SampledValueControl elements are configured using the publisher pluging. There are three panes combined allowing the editing of Sampled Value Control Blocks.

The pane contains a set of settings allocated in the element SampledValueControl:

• name: The main identifier for the Sampled Value within the SCL. It must be unique for all SampledValueControl elements in the same parent element and influences the Sampled Value Control Block reference.
• desc: An optional string describing the SampledValueControl element.
• multicast: Only visible when false, as non-multicast sampled value streams are deprecated.
• smvID: A unique identifier for the Sampled Value.
• smpMod: The mode in which the sample rate is expressed. Options include Samples per period, sampled per second, or Seconds per sampled. The default is Samples per period
• smpRate: The sample rate, dependent on the sample mode.
• noASDU: Timestamps per Ethernet packet.
• securityEnabled: Specifies the type of security measures the Sampled Value has: encryption and/or signature, or none of the two.

To change any of the attributes, click on the Save button within the wizard.

Editing the Optional information pane

This wizard enables the configuration of optional behaviors for the sampled value stream.

1. refreshTime: Specifies whether the timestamp of the generation of the sample value stream shall be included.

2. sampleRate: Determines whether the sample rate and sample mode shall be part of the sampled value stream.

3. dataSet: Specifies whether the data set reference shall be part of the sampled value stream.

4. security: Determines whether the sampled value stream contains the security attribute (Used for future definitions such as digital signature).

5. synchSourceId: Specifies whether the the sampled value stream contains the synchronizing grand master ID.

    

Communication page

This wizard allows you to define all communication-related settings for the Sampled Value. This information is saved in the Communication section, more precisely in the element SMV.

1. MAC-Address: Specifies the destination MAC address of the Sampled Value, ranging from 01-0C-CD-04-00-00 to 01-0C-CD-04-01-FF.

2. APPID: Sets the APPID of the Sampled Value, and it is recommended to be unique throughout the entire project.

3. VLAN-ID: Determines the virtual LAN ID to which the Sampled Value shall be limited.

4. VLAN-PRIORITY: Sets the priority of the Sampled Value message, allowing prioritization of time-critical messages like trip signals over non-time-critical messages.