Different behavior between the "Start" button in the IDE and the Cmp function "AppStartApplication()" ^{CODESYS Forge talk (Thread)}
Different behavior between the "Start" button in the IDE and the Cmp function "AppStartApplication()"
Last updated: 2024-03-22

OPTO22 Groov Epic PR2 Modbus Comms Dropping out every 2 hours and 4 Mins ^{CODESYS Forge talk (Thread)}
OPTO22 Groov Epic PR2 Modbus Comms Dropping out every 2 hours and 4 Mins
Last updated: 2024-04-15

OPTO22 Groov Epic PR2 Modbus Comms Dropping out every 2 hours and 4 Mins ^{CODESYS Forge talk (Thread)}
OPTO22 Groov Epic PR2 Modbus Comms Dropping out every 2 hours and 4 Mins
Last updated: 2024-04-15

How to use GPIO (and IOT2000 IO-Module) with CODESYS Control for IOT2000 SL ? ^{CODESYS Forge talk (Thread)}
How to use GPIO (and IOT2000 IO-Module) with CODESYS Control for IOT2000 SL ?
Last updated: 2024-05-05

How to use GPIO (and IOT2000 IO-Module) with CODESYS Control for IOT2000 SL ? ^{CODESYS Forge talk (Thread)}
How to use GPIO (and IOT2000 IO-Module) with CODESYS Control for IOT2000 SL ?
Last updated: 2024-05-05

How to use GPIO (and IOT2000 IO-Module) with CODESYS Control for IOT2000 SL ? ^{CODESYS Forge talk (Thread)}
How to use GPIO (and IOT2000 IO-Module) with CODESYS Control for IOT2000 SL ?
Last updated: 2024-05-05

Persistence Variables missing and DO NOT retain from Persistence Channel when using Boot Application ^{CODESYS Forge talk (Thread)}
Persistence Variables missing and DO NOT retain from Persistence Channel when using Boot Application
Last updated: 2024-05-15

Post by davidbo on Toradex and CODESYS and licensing ^{CODESYS Forge talk (Post)}
Does it mean that the USB dongle has to be inserted all time in order, for the device running in licensed mode?
Last updated: 2025-10-20

Using a raspberry pi and NVLs to log variables outside of Codesys ^{CODESYS Forge talk (Thread)}
Using a raspberry pi and NVLs to log variables outside of Codesys
Last updated: 2025-11-21

CoDeSys v3.5: creating libraries for both 32-bit and 64-bit controllers ^{CODESYS Forge talk (Thread)}
CoDeSys v3.5: creating libraries for both 32-bit and 64-bit controllers
Last updated: 2025-12-10

Trend legend naming and access/config to/of trend/legend-variables ^{CODESYS Forge talk (Thread)}
Trend legend naming and access/config to/of trend/legend-variables
Last updated: 2025-12-22

UC20-M4000 Redundancy – Application is not automatically synchronized and redundancy breaks after online change ^{CODESYS Forge talk (Thread)}
UC20-M4000 Redundancy – Application is not automatically synchronized and redundancy breaks after online change
Last updated: 2026-03-16

Blocking UDP ports 1740–1743 and 22350 to disable CODESYS network scan (startup + device discovery) ^{CODESYS Forge talk (Thread)}
Blocking UDP ports 1740–1743 and 22350 to disable CODESYS network scan (startup + device discovery)
Last updated: 2026-03-31

CodeSys OPC UA client Unable to Connect To OPC UA sever through Username and password ^{CODESYS Forge talk (Thread)}
CodeSys OPC UA client Unable to Connect To OPC UA sever through Username and password
Last updated: 2026-05-07

Codesys Trend - setting Y axis minimum and maximum as variables - error ^{CODESYS Forge talk (Thread)}
Codesys Trend - setting Y axis minimum and maximum as variables - error
Last updated: 2026-05-22

Mismatch between coordinate monitor and actual motion using SMC_GroupJog2, MC_MoveLinearAbsolute (6DOF) ^{CODESYS Forge talk (Thread)}
Mismatch between coordinate monitor and actual motion using SMC_GroupJog2, MC_MoveLinearAbsolute (6DOF)
Last updated: 2026-05-26

MBA FPX 5002 Assessment 3: Advanced Business Strategy and Corporate Decision-Making ^{CODESYS Forge talk (Thread)}
MBA FPX 5002 Assessment 3: Advanced Business Strategy and Corporate Decision-Making
Last updated: 2026-06-01

Using SCADA Data and C# Integration for Real-Time Production KPI Monitoring ^{CODESYS Forge talk (Thread)}
Using SCADA Data and C# Integration for Real-Time Production KPI Monitoring
Last updated: 2026-06-16

CodeMeter Network Server: Keep runtime dongle local-only and export only a second CmStick ^{CODESYS Forge talk (Thread)}
CodeMeter Network Server: Keep runtime dongle local-only and export only a second CmStick
Last updated: 2026-08-02

SMC_Interpolator / CNC Abort – ControlAxisByPos Sometimes Remains Busy and Axis Continues Moving ^{CODESYS Forge talk (Thread)}
SMC_Interpolator / CNC Abort – ControlAxisByPos Sometimes Remains Busy and Axis Continues Moving
Last updated: 1 day ago

Question about Demo License limitations for Modbus TCP communication and Fieldbus Instances ^{CODESYS Forge talk (Thread)}
Question about Demo License limitations for Modbus TCP communication and Fieldbus Instances
Last updated: 2026-02-28

Codesys Trend - setting Y axis minimum and maximum as variables - error ^{CODESYS Forge talk (Thread)}
Codesys Trend - setting Y axis minimum and maximum as variables - error
Last updated: 2026-03-22

_NEW when used with classes and interfaces. Interface shows "Hidden Instance" in watch. ^{CODESYS Forge talk (Thread)}
_NEW when used with classes and interfaces. Interface shows "Hidden Instance" in watch.
Last updated: 2026-03-24

WebVisu: switch-frame destroys and rebuilds referenced visualization - is retention configurable? ^{CODESYS Forge talk (Thread)}
WebVisu: switch-frame destroys and rebuilds referenced visualization - is retention configurable?
Last updated: 2026-08-07

Post by gustavocsw on MQTT memory leak problem ^{CODESYS Forge talk (Post)}
Hello everyone, I'm using the IoT Library to implement the MQTT communication with my local broker server in order to publish and subscribe at specifics topics to share and consume information about my application. But, it seems that are occurring some memory leak problem in a "high" frequency (more than 10 Hz) subscribe process. I follow the same method as in IoT Lib exemples, and at first looks perfect but my PLC was rebooting frequently and when I check its memory usage that was increasing as fast as the subscribe massage was sent. I'm using a WEG PLC410 and a WEG PLC500, and this error occurred in both of them (including in CODESYS Control Win x64). The application sends to the system a message JSON with the float payload Ex. {"data" : 0.8500}, but this happens with a INT, or BOL as well. I use the follow code in my application to find the value: //FindFirstValueByKey VARs PROGRAM JSON_VELO VAR //------Setting the JSON Subscriber to Set the Relay Value jsonDataVelo : JSON.JSONData; jsonByteArrayReaderVelo : JSON.JSONByteArrayReader; xST1okVelo : BOOL; FindFirstValueByKeyVelo : JSON.FindFirstValueByKey; jsonElementVelo : JSON.JSONElement; xDoneReaderVelo : BOOL; xDoneFindVelo : BOOL; //STRING and WSTRING for Subscribe the massage sPayloadJsonVelo : STRING := 'opa'; psPayloadJsonVelo : POINTER TO BYTE := ADR(sPayloadJsonVelo); //wsPayloadJsonRelaySet : WSTRING := "opa"; wsPayloadJsonVelo : WSTRING := STRING_TO_WSTRING('opa'); pwsPayloadJsonVelo : POINTER TO WORD := ADR(wsPayloadJsonVelo); lrVelo : LREAL; xKeepAliveVelo : BOOL; xSetVelo : BOOL; RSSet : RS; LIMPAR : STRING; //Find the msg end sFindVelo : STRING := '}'; psFindVelo : POINTER TO STRING := ADR(sFindVelo); iLenVelo : INT; iSizeVelo : INT := 12; udiContMsg : UDINT; END_VAR // FindFirstValueByKey CODE // Relay Set configuration xSetVelo := MQTT_SUBSCRIBER.RSVelo.Q1; IF xSetVelo THEN xKeepAliveVelo := TRUE; END_IF IF xKeepAliveVelo THEN udiContMsg := udiContMsg + 1; iLenVelo := TO_INT(StrLenA(psPayloadJsonVelo)); iSizeVelo := iLenVelo - TO_INT(MQTT_SUBSCRIBER.udiPayloadSizeVelo); StrDeleteA(psPayloadJsonVelo,iSizeVelo,iLenVelo); wsPayloadJsonVelo := STRING_TO_WSTRING(sPayloadJsonVelo); pwsPayloadJsonVelo := ADR(wsPayloadJsonVelo); //MQTT.ConvertUTF8toUTF16(sourceStart:= ADR(sPayloadJsonVelo), targetStart:= ADR(wsPayloadJsonVelo), dwTargetBufferSize:= TAM, bStrictConversion:= 1); //Reset jsonByteArrayReader jsonByteArrayReaderVelo ( xExecute := TRUE, pwData := pwsPayloadJsonVelo, jsonData := jsonDataVelo, xDone => xDoneReaderVelo ); FindFirstValueByKeyVelo( xExecute := xDoneReaderVelo, wsKey := "data", diStartIndex:= 0, jsonData := jsonDataVelo, jsonElement => jsonElementVelo, xDone => xDoneFindVelo ); IF xDoneFindVelo THEN lrVelo := jsonElementVelo.value.lrValue; //Reset jsonByteArrayReader jsonByteArrayReaderVelo ( xExecute := FALSE, pwData := pwsPayloadJsonVelo, jsonData := jsonDataVelo, xDone => xDoneReaderVelo ); FindFirstValueByKeyVelo( xExecute := FALSE, wsKey := "data", diStartIndex:= 1, jsonData := jsonDataVelo, jsonElement => jsonElementVelo, xDone => xDoneFindVelo ); xKeepAliveVelo := FALSE; GVL.xSetVeloRead := TRUE; END_IF END_IF And this to subscribe at the topic: //SUBSCRIBE VAR: //----------------- Subscribe Velocity ----------------------- MQTTSubscribeVelo : MQTT.MQTTSubscribe;//Variable MQTTSubscriber block -X - function-X wsTopicSubscribeVelo : WSTRING(1024) := "CORE/odometry/GET/data/simp"; // Topic to publish a message sSubscribeMassageVelo : STRING; udiPayloadSizeVelo : UDINT; xSDoneVelo : BOOL; xSErrorVelo : BOOL; xReceiveVelo : BOOL; eSTypeVelo : MQTT.MQTT_ERROR; eSMQTTErrorVelo : MQTT.MQTT_ERROR; RSVelo : RS; udiCont : UDINT; //SUBSCRIBE CODE: MQTTSubscribeVelo( xEnable:= MQTT_CLIENT.xConnection_Broker AND NOT xSErrorVelo AND NOT JSON_VELO.xKeepAliveVelo, pbPayload:= JSON_VELO.psPayloadJsonVelo, udiMaxPayloadSize:= SIZEOF(JSON_VELO.sPayloadJsonVelo), udiPayloadSize => udiPayloadSizeVelo, mqttClient:= MQTT_CLIENT.ClientMQTT, wsTopicFilter:=wsTopicSubscribeVelo, xDone => xSDoneVelo, xError=> xSErrorVelo, xReceived => xReceiveVelo, eMQTTError=> eSMQTTErrorVelo ); RSVelo(SET := xReceiveVelo, RESET1 := JSON_VELO.xKeepAliveVelo);
Last updated: 2024-09-09

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