Post by mogam on Internal error:System.NullReferenceException: The object reference was not set to an object instance. ^{CODESYS Forge talk (Post)}
Hi everyone, I have a my App that reads values from a shared memory than 2 variables x,y were calculated. here as you can see in my code: PROGRAM PLC_PRG VAR szName : STRING := '/SM'; ( Name of the shared memory.) uxiSize : __UXINT := 646 * 2 * SIZEOF(REAL); ( Size of the shared memory. ) hShm : RTS_IEC_HANDLE; ( Handle to the shared memory ) pStart : POINTER TO REAL; ( Pointer to the first element in the memory ) pData : POINTER TO REAL; ( Pointer, which is incremented until the last sign in the memory is reached. ) shared_data :ARRAY[0..645, 0..1] OF REAL; velocity : ARRAY[0..2] OF REAL; ( Velocity array ) position : ARRAY[0..2] OF REAL; ( Position array ) angleDepth : ARRAY[0..645, 0..1] OF REAL; ( Angle and depth array ) xEndOfMemory : BOOL; x : ARRAY[0..645] OF REAL := 1.0; y : ARRAY[0..645] OF REAL := 1.0; (* Result of actions at the memory. *) OpenResult : RTS_IEC_RESULT; ReadResult : RTS_IEC_RESULT; PointerResult : RTS_IEC_RESULT; DeleteResult : RTS_IEC_RESULT; CloseResult : RTS_IEC_RESULT; i : INT; END_VAR ( Open the shared memory ) hShm := SysSharedMemoryOpen2(szName, 0, ADR(uxiSize), ADR(OpenResult)); IF hShm <> RTS_INVALID_HANDLE THEN (* Read the entire shared memory table *) SysSharedMemoryRead(hShm:= hShm, ulOffset:= 0, pbyData:= ADR(shared_data), ulSize:= uxiSize, pResult:= ADR(ReadResult)); (* Fetch the pointer from the shared memory. The pointer is pointing to the first element address *) //pStart := SysSharedMemoryGetPointer(hShm, ADR(PointerResult)); (* Close the shared memory *) //CloseResult := SysSharedMemoryClose(hShm := hShm); (* Read velocity and position data from the shared memory *) FOR i := 0 TO 2 DO velocity[i] := shared_data[i, 0]; position[i] := shared_data[i, 1]; END_FOR; (* Read angle and depth data from the shared memory *) FOR i := 0 TO 645 DO angleDepth[i, 0] := shared_data[(i + 6), 0]; angleDepth[i, 1] := shared_data[(i + 6), 1]; END_FOR; FOR i := 0 TO 645 DO x[i] := angleDepth[i, 1]*COS(angleDepth[i, 0]); y[i] := angleDepth[i, 1]*SIN(angleDepth[i, 0]); END_FOR; END_IF For these values an XY-CHART needs to be done and when i create a visualisation and set the x data and y data when i try to compile, i recieve this error: ------ Übersetzungslauf gestartet: Applikation: Device.Read_App ------- Code typisieren ... [FEHLER] Internal error:System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt. bei _3S.CoDeSys.LanguageModelManager.LDateType.Accept(ITypeVisitor typvis) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..
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(String , IVariable[]& , ISignature[]& , IScope& ) bei ..visit(_IVariableExpression , AccessFlag ) bei ..
(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..
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(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..
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(_IPointerType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..
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(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei ..
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(_IUserdefType ) bei ..(_IVariable , IScope5 , _ICompileContext , _ISignature ) bei ..(_ISignature , IScope5 , _ICompileContext ) bei _3S.CoDeSys.Compiler35140.Compiler.
(_ICompileContext , _IPreCompileContext , _ICompileContext , IProgressCallback ) bei _3S.CoDeSys.Compiler35140.Compiler.
(_ICompileContext , Boolean , Boolean , _IPreCompileContext , _IPreCompileContext , _ICompileContext , Boolean , Boolean& , IProgressCallback ) bei _3S.CoDeSys.Compiler35140.Compiler.
(Guid , Boolean , Boolean , Boolean , Boolean& , _ICompileContext& , _ICompileContext& , IProgressCallback , Boolean , Boolean ) Kompilierung abgeschlossen -- 1 Fehler, 0 Warnungen Übersetzung abgeschlossen -- 1 Fehler, 0 Warnungen : Kein Download möglich!
Last updated: 2024-05-24

Post by abinvest579 on TCP Client ^{CODESYS Forge talk (Post)}
Hi All, I am using codesys based plc to read and control magna power DC supply over LXI protocol using SCPI command. To connect device required socket programming for that i am using Net base service library function block TCP_Client to establish connection over TCP/IP , TCP_Write to write SCPI commands and TCP_Read to read data from Magna power DC supply. I have attached screenshot for logic developed. I am able to connect and write commands to device but i not receiving any information from device. For writing Commands i also tried various end of line character like \n,<nl>, A, D, 10, 13, 0x0A, 0x0D but not received any status from device. For testing purpose i am using simple command '*IDN?' to read data. Also if tried to check on hercules software what data actually plc read, first it read correct data after that is read wrong data as see in screen shot. 'Hello World' was correct read and after that Codesys in replaced with 'Codesysorld' that is not correct way. Same issue also appeared for send data. Any one have face same issue how i can read data directly from device correctly and send data please suggest solution on this.</nl>
Last updated: 2024-07-01

Post by arnaud on eCockpit - unable to start simulation ^{CODESYS Forge talk (Post)}
Hi there! I'm using eCockpit WAGO software to develop HMI's for multiple projects. As I recently starting this, my knowledge on the software is somewhat limited (so maybe my question is a simple one). For most of my projects I can simulate the application and start it to test the code and HMI. However for two projects, I can initiate the "simulation activation" but I cannot start it. Nothing happens when I press start and the visualization shows "The online visualization is waiting for connection. please start the application". - I don't see any errors in the messages - Initially the project are made by a colleague, which moved on. I guess I'm forgetting something, like missing a setting. I appreciate any help I can get. If you need more information to help me out, let me know. Thanks!
Last updated: 2023-08-25

Post by c3po on SNMP Communication with WAGO 750-8212 PFC ^{CODESYS Forge talk (Post)}
Hello folks, my problem is a bit bigger for just one question. So let's start with the easiest. But first, my system setup: It's a WAGO 750-8212 PFC with some I/O-modules. I try to communicate with the controlsystem over SNMP using the IIoT library from codesys. https://content.helpme-codesys.com/de/CODESYS%20Examples/_ex_iot_snmp_service.html Is there some expirience with this kind of communication? It's just about transfering some data from PFC to network and setting some analogsettings from network to the PFC. So my easiest question: Do I ever need the SNMP_Agent or can I use the SET / GET function as standalone, without the agent? (maybe some more questions will follow, if someone will answer to my request) thanks so far
Last updated: 2024-08-21

Post by fredruel on ModbusServer became unreachable if reach maximum of 16 byClientConnections ^{CODESYS Forge talk (Post)}
Hello Fraziersedge, the solution of Codesys might be to update your codesys to the lastest version but it was not possible for us. In our Codesys V3.5 SP9 patch 8 I was able to fix this bug. I change my ModbusTCP slave component version or one of the sub component version (ex: SysSocket). Look at the picture in attachement that's the receipe that have work for us. When I got the bug my version of ModbusTCP slave was 3.5.5.0 with SysSocket at 3.5.6.0 and I change to ModbusTCP slave 3.5.14.0 with same version 3.5.14.0 of SysSocket event if I still use codesys V3.5 SP9 patch 8.
Last updated: 2024-08-27

Post by struccc on HTML5 Controls - string(>80) values ^{CODESYS Forge talk (Post)}
Dear all, does anyone have experience with HTML5 controls recently? CODESYS 3.5.20.30 / Visualization 4.6.0.0 I'd like to create a simple lightweight text editor, with proper multiline handling, cut & paste, scrolling, etc. And it seems to work fine, just have problems with strings longer than 80 bytes.... Declaring a variable sText1 : STRING(8000) and referencing it in the HTML5 Controls corresponding value property works perfectly one way: the code receive the data as a string (See log1)... (Note TypeID 1000...) Also sending back the data (seems to work (See log2) except it doesn't change the value of the bound variable. Probably the issue is with using SendSimpleValue method... Naturally, I could do a workaround, but maybe there is a more standard way to implement this... Please let me know if you have any suggestions.
Last updated: 2024-10-23

Post by s1mon on Two OneWireMaster on one Raspberry PI 5 ^{CODESYS Forge talk (Post)}
Hi, I want to use two OneWireMaster on a Raspberry Pi5. I'm running Codesys Control for Raspberry Pi 64SL V 4.15.0.0. Under Linux I've configured two GPIOs for 1w bus usage on GPIO4 and GPIO27. Under Linux both masters seem to work fine and I can readout both sensors connected to both GPIOs. The two masters are 'w1_bus_master1' and 'w1_bus_master2'. In Codesys I've configured to OneWireMasters with the corresponding file paths. But in Codesys the 2nd onewiremaster "w1_bus_master2" doesn't work. Status is showing "OnewireMaster : Not running" What am I doing wrong? Does Codesys on Raspberry support multiple OneWireMasters? Any help is appreciated.
Last updated: 2025-06-10

Post by s1mon on Two OneWireMaster on one Raspberry PI 5 ^{CODESYS Forge talk (Post)}
Hi, I want to use two OneWireMaster on a Raspberry Pi5. I'm running Codesys Control for Raspberry Pi 64SL V 4.15.0.0. Under Linux I've configured two GPIOs for 1w bus usage on GPIO4 and GPIO27. Under Linux both masters seem to work fine and I can readout both sensors connected to both GPIOs. The two masters are 'w1_bus_master1' and 'w1_bus_master2'. In Codesys I've configured to OneWireMasters with the corresponding file paths. But in Codesys the 2nd onewiremaster "w1_bus_master2" doesn't work. Status is showing "OnewireMaster : Not running" What am I doing wrong? Does Codesys on Raspberry support multiple OneWireMasters? Any help is appreciated.
Last updated: 2025-06-10

Post by timvh on Dynamically enabling/disabling Modbus slave devices in runtime (performance issue with timeouts) ^{CODESYS Forge talk (Post)}
As far as I remember, the Reconfigure functionality doesn't work for Modbus devices. But... Each Modbus device in your device tree has a name. You can set the property "Enable" of this device to FALSE to stop communicating with it. So if one of your Modbus Slave devices name is "MbSlave1" in the device tree, then in your code you can set the Enable to FALSE to let it stop communicating: MbSlave1.Enable := FALSE; Please let us know if this worked on your controller with your application and your CODESYS version. Alternatively you could use the ModbusFB library. See: https://forge.codesys.com/prj/codesys-example/modbus/home/Home/
Last updated: 2025-08-13

Post by mp9876 on Attempting customizing menus fails in LADDER environment; due to free CODESYS version ? ^{CODESYS Forge talk (Post)}
Hello, I am attempting to get started here and bumping into this funny issue. I am using this version of CODESYS: ============================== DETAILED VERSION INFORMATION Created at 2024-03-10 ============================== Startup profile: ............................................................... CODESYS V3.5 SP19 Patch 6 OS version: .................................................................... Microsoft Windows NT 10.0.19045.0 .NET version: .................................................................. 4.0.30319.42000 When attempting to customize the menus or toolbar it does not work. The additional commands, Insert TON box & Insert TOFF box, are present in the Customize Menus or Toolbars when re-opening the Customize options but neither the menu or the toolbar gets updated with these. Would also like to add them in the Ladder Toolbox as there are only 9 items in there which does not include the one mentioned above. Due because of the version I am using ? Any assistance would definitely be appreciated. Thank you Mike
Last updated: 2024-03-10

Post by mattkaree on Mapping values with etherCAT mailbox communication ^{CODESYS Forge talk (Post)}
I am using a WAGO PFC200 PLC as an etherCAT master and a Keyence IV3-G120 with DL-EC1A attached as an etherCAT slave. I am using CODESYS V3.5 SP21 Patch 3. I was able to set up mailbox communication and can see values changing accordingly, but I want to know how I can map these values and reference them in my program. I am able to map the process data objects in the 'EtherCAT I/O Mapping' tab, but there is no where to map the mailbox values in the 'CoE Online' tab. Is there a way I can reference one of these values in my code?
Last updated: 2026-01-27

Post by rik123456 on Alarmmanagement – Dynamic Alarm List ^{CODESYS Forge talk (Post)}
Hi, I had a question about alarm management in the CODESYS visualization. I am currently investigating to what extent the alarm visualization can be built dynamically. In my program, I have developed a motor block that is used for multiple motors. When the emergency stop of one or more motors is activated, the corresponding motors are displayed in the alarm list (see image). This works quite well. I achieved this by linking variables to a latch, after which a piece of code displays the motors that are in emergency stop. My question is: do I need to create a separate latch for each motor or can I use a single latch to display multiple alarms of a motor underneath each other? This would then look like this: Time…: M1 Emergency Stop Active Time…: M4 Emergency Stop Active
Last updated: 2026-04-20

Post by eschwellinger on Two OneWireMaster on one Raspberry PI 5 ^{CODESYS Forge talk (Post)}
check if the second onwire master is accessible in the configfile path setting. /etc/codesyscontrol/
Last updated: 2025-06-12

Post by davep on RaspberryPI reconnection error ^{CODESYS Forge talk (Post)}
Sorry Eschwellinger, but the October release is the one that doesn't work... TY Davide Pilia
Last updated: 2024-01-22

Post by trycyclepower on Only single ehternet ip drive is communicating ^{CODESYS Forge talk (Post)}
I had them inserted separately, now under one Ethernet tree they are working.
Last updated: 2024-03-11

Post by eschwellinger on Two OneWireMaster on one Raspberry PI 5 ^{CODESYS Forge talk (Post)}
hm.. could you add the project or at least parts of it?
Last updated: 2025-10-20

Import RsLogix 5000 project to Codesys ^{CODESYS Forge talk (Thread)}
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