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Overview

Access Types define the specific methods for reading and writing values for each data Device Point in a solution, including settings such as polling rate, read on startup, and unsolicited input acceptance.

In addition, the platform provides On Display and On Or Server Access Type configurations that enable your solution to control the data read and write permissions. These configurations are useful for projects solutions with many communication points Device Points but do not require constant data updates, reducing computational load and improving performance. 

On this page:

Table of Contents
maxLevel3

Creating an Access Type

To create and configure an Access Type, follow these steps:

    Access
  1. Access Devices → Access Types.
  2. Click on
    3. the 
  3. the plus icon.
  4. Fill all the property fields with you your desired configuration (see the table below for more details about each option).
    5. Click
  5. Click Ok.

Access Types properties

The following table describes each configuration property when creating an Access Type:

Field

Description

Name

Enter a name for Name of this Access Type.

Read

Read Polling

Select when you want to enable Enables read polling.

Read Polling Rate

Enter Defines how often the address value is retrieved.

Read Trigger

Enter an object property that tells the system when to read the value.

On Startup

When selected, the system reads the value on startup.

Write

Write Events

Select to enable Enables the writing of values to the PLC.

Write Event

Select Defines when is the value is written.

WriteTriggerWrite Trigger

Enter an object property that tells the system when to write the value.

Settings

Accept Unsolicited

When selectedIf enabled, the system accepts values from the PLC, even if the polling time has not yet elapsed.

Use Static Blocks

Select to Enables the use of the block command field.

Block Command

Enter a A definition for each block that will be created. Check the driver documentation to see if the specific driver uses this field and field and the valid values.

Description

Enter a description for Description of the access type.


On Display

or

Or Server

Access Types

type

The On Display Or Server Access Type is an excellent tool for projects with a large number of many communication points but does not require the data to be constantly updated for all only requires data updates for some of them. It can help computers that lack without the computational power to handle a huge volume of massive data exchange while maintaining other modules (Scripts, Alarms, etc.) simultaneously.active. The On Display Or Server Access Type operation process can be is divided into two aspects:

  • On Display: The On Display part means that your Communication Device Point will only begin Reading/Writing reading or writing when the Project solution's display containing these tags is open. To illustrate, let us say we have
    • Let us imagine a project with two displays
    :
    • , one for Line A and
    the other
    • another for Line B. Each display has its specific Tags added to it
    (Tag
    • .
    LineAProduct1..., Tag.LineBProduct1...)
    • When the Project is running, there is no need to send
    /
    • or receive data for all
    Tags
    • tags in the PLC. The
    Project
    • solution only needs to send
    /
    • or receive data for the
    ones in the display currently opened on the Visualizer
    • opened displays of the visualizer. So, when the
    LineA
    • Line A display is open, only
    LineA
    • Line A tags will communicate. The same goes for LineB.
  • On Server: The OrServer OrServer or OPCServer  OPCServer means that if your Project solution runs as an OPC Server, the AccessType Access Type will behave as if its ReadEnable its Read Enable property is set to Always. Suppose  
    • Suppose you have the tags on the server side as Script Tasks, Classes, Expression, or Alarm Items. In that case, you must create a new
    AccessType
    • Access Type specific for them with the
    ReadEnable
    • Read Enable option in Always.

Configuring

the

an Access Type as On Display or Server

To configure an Access type as On Display Or Server, follow these steps:

  1. Access Devices → Access Types.
  2. Click on the plus icon.
  3. On the Read Polling property, choose On Display Or Server. This property is enough for the Reading portion of the communication.
  4. To Check the Write Events box to Enable Writing Events, check the Write Events box.
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Info

ONLY when and while ANY of Only when these options are met can the Communication Device Points with this Access Type read/write data.

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