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changes.mady.by.user André Fugledal

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changes.mady.by.user Magnus Antonsen

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Input:

topic : STRING(255);

xTrigger : BOOL;

message : STRING;

Output:




Info

Type: FunctionBlock

Responsible: André


To set up a MQTT publisher in codesys the following libraries are necessary to use:

  • WagoSysPlainMem
  • WagoAppCloud
The functionblock MQTT_Publisher was then created , with the following code:

Before the PLC can publish to over MQTT, the WagoAppCloud settings needs to be changed to fit the system this is done by writing the PLC's IP into the searchbar of a web browser, then cloud connectivity → connection 1. The settings are set to:

Image Added 

Code Block
languageactionscript3
titleCode Overview
linenumberstrue
FUNCTION_BLOCK MQTTPublisher


VAR_INPUT


    topic : STRING(255);


    xtrigger : BOOL;


    message : STRING;


END_VAR


VAR


    mqttPub : wagoappcloud.FbPublishMQTT_2(econnection := econnectionid.Connection1);


    dwSize : DWORD;


    aData : ARRAY[0..100] OF BYTE;


    xRetain : BOOL := FALSE;


    xError : BOOL := FALSE;


    xBusy : BOOL := FALSE;


    eQualityOfService : eQualityOfService := 1;


END_VAR

######################



wagosysplainmem.MemCopy(pDest:=ADR(aData),pSource:=ADR(message),udiSize:=TO_WORD(len(message))); 


mqttPub(sTopic:=topic,eQualityOfService:=eQualityOfService,xRetain:=xRetain,dwSize:=TO_WORD(len(message)),aData:=aData,xTrigger:=xtrigger,xBusy=>xBusy,xError=>xError);

Before the PLC can publish to over MQTT, the WagoAppCloud settings needs to be changed to fit the system this is done by writing the PLC's IP into the searchbar of a web browser. The settings are set to:

Image Removed