FB_BA_Subscriber

The FB_BA_Subscriber is a function block for subscribing to data. It does not have to be called explicitly. This description serves solely to explain the inheritance structure of the publisher function blocks.

Inheritance hierarchy

FB_BA_Base

Syntax

FUNCTION_BLOCK ABSTRACT FB_BA_Subscriber EXTENDS FB_BA_Base IMPLEMENTS I_BA_Subscriber
VAR_OUTPUT
  bError                : BOOL;
END_VAR
VAR_INPUT CONSTANT
  {region 'Fixed Parameters'}
    {attribute 'parameterCategory' := 'Communication'}
    {attribute 'no_copy'}
    sTarget             : T_BA_MedString;
  {endregion}
  {region 'Variable Parameters'}
    {attribute 'parameterCategory' := 'Communication'}
    {attribute 'no_copy'}
    tReadInterval       : TIME := XBA_Param.tSub_DefReadInterval;
    {attribute 'parameterCategory' := 'Communication'}
    {attribute 'no_copy'}
    tReadTolerance      : TIME := XBA_Param.tSub_ReadTolerance; // Time to wait before indicating a continuous error.
    {attribute 'parameterCategory' := 'Communication'}
    {attribute 'no_copy'}
    bClearOnReadError   : BOOL := XBA_Param.bSub_ClearOnReadError; // Clear data if an error occurs.
  {endregion}
END_VAR

Inputs CONSTANT

Name	Type	Description
sTarget	BOOL	AMS NetId of the Publisher. Optionally, the port of the remote ADS device can be specified. The default setting is port 851.
tReadInterval	TIME	Time interval at which data from the subscribed publisher is read. The default setting is 30 seconds.
tReadTolerance	TIME	If there is a read error after the configured time, the status changes internally to Error.
bClearOnReadError	BOOL	Optionally, the subscribed data can be reset in the event of an error (i.e. as soon as the system switches to the Error state). This parameter is FALSE in the default settings.

Outputs

Name	Type	Description
bError	BOOL	Displays the current error state of the subscription. Details can be found in the corresponding error message in the event of an error.

Name

Type

Description

bError

BOOL

Displays the current error state of the subscription.

Details can be found in the corresponding error message in the event of an error.

Requirements

Development environment	Required PLC library
TwinCAT from v3.1.4024.17	Tc3_BA2 from v4.8.9.0