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Protocol specification
Basic concepts
Initiation of communication
Communication line configuration
Protocol configuration on the communication line
Protocol configuration on the communication station
I/O tag configuration
Browser dialog window
Tell commands
Literature
Changes and modifications
Document revisions


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popis_protokolu
popis_protokolu
Protocol specification

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subscription
subscription
Subscription: an object on OPC UA server that is defined by the client. It returns the notifications about change of monitored items.


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inicializacia_komunikacie
inicializacia_komunikacie
Initiation of communication

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NameMeaningUnitDefault value
Sampling typeParameter defines a sampling frequency of monitored  object. When using "Publishing rate", the frequency is equivalent to time Requested Publishing Interval, which is set on the communication station level.
"Practical fastest rate" sets the sampling frequency on the maximum value.
"Custom rate" enables to specify the custom sampling interval, which may be defined in "Sampling Time".
Publishing rate/Practical fastest rate/Custom ratePublishing rate
Sampling timeParameter allows you to set the custom sampling frequency if "Sampling type" is "Custom rate".ss.ms0.0
DeadBand typeDeadband is a band in which the change of value does not cause Data Change Notification, which is the part of Publish Message. When using "None", this band is ignored. Otherwise, there is used the relative or absolute value ("Percent"/"Absolute") from "DeadBand value".None/Absolute/PercentNone
DeadBand valueParameter defines the custom value of deadband if you chose the relative/absolute value ("Percent"/"Absolute").
0.0
Trigger typeParameter specifies the condition which causes Data Change Notification. When using "Status", only the status change is reported. Change of value and time stamp is ignored. When using "Status,Value", the change of time stamp is ignored. "Status,Value,Timestamp" ensures the reporting in all options, i.e. when changing the status, value or time stamp.
Note: a specific Simatic S7-1500 did not send value changes if this parameter was set to default "Status, Value, Timestamp" - changing it to "Status, Value" helped.
Status/Status,Value/Status,Value,TimestampStatus,Value,Timestamp

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OPC Foundation manuals are placed on http://www.opcfoundation.org/.


  • OPC UA Part 1 - Overview and Concepts 1.01 Specification
  • OPC UA Part 2 - Security Model 1.01 Specification
  • OPC UA Part 3 - Address Space Model 1.01 Specification
  • OPC UA Part 4 - Services 1.01 Specification
  • OPC UA Part 5 - Information Model 1.01 Specification
  • OPC UA Part 6 - Mappings 1.00 Specification
  • OPC UA Part 7 - Profiles 1.00 Specification
  • OPC UA Part 8 - Data Access 1.01 Specification

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