WOLFRAM SYSTEM MODELER

TriggeredRead

A block for reading data from an OPC server at intervals determined by an external Boolean signal (trigger)

Wolfram Language

In[1]:=
SystemModel["OPCClassic.Blocks.SamplerInteger.TriggeredRead"]
Out[1]:=

Information

This block reads data of type Integer from the OPC server it is connected to. Unlike the read blocks that have a parameter for setting the sample period, the triggered read blocks read data when Boolean input signal trigger has a rising edge. The block inherits the properties of the partial model TriggeredSampler.

At every sampling instant, external function readExternalInteger is called from within the block.

Relevant Parameters

  • itemName: which OPC item to read data from

Interfaces

  • y: an Integer output, which is the sampled signal
  • serverID: the connector that connects the block to the OPC server component
  • trigger: a Boolean input that determines when the block should sample data

Parameters (2)

itemName

Value:

Type: String

Description: The OPC item that data should be written to or read from
y_start

Value: 0

Type: Integer

Description: initial value of output signal

Connectors (3)

trigger

Type: BooleanInput

Description: Boolean input that determines when sampling should occur
serverID

Type: BlockConnector

Description: The unique ID of the server the block is connected to
y

Type: IntegerOutput

Description: The data read from the item on the OPC server

Used in Components (1)

MultipleTriggeredRead

OPCClassic.Blocks.SamplerInteger

A block for reading data from multiple items on an OPC server at intervals determined by an external Boolean signal (trigger)