OPC-UA ApplicationUri / ProductUri ^{CODESYS Forge talk (Thread)}
OPC-UA ApplicationUri / ProductUri
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Transparent wireless serial bridge for Modbus RTU – experience with LoRa/WiFi RS-485 link to CODESYS runtime ^{CODESYS Forge talk (Thread)}
Transparent wireless serial bridge for Modbus RTU – experience with LoRa/WiFi RS-485 link to CODESYS runtime
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Post by dafalin-codesys on Transparent wireless serial bridge for Modbus RTU – experience with LoRa/WiFi RS-485 link to CODESYS runtime ^{CODESYS Forge talk (Post)}
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Post by tvm on Discussion for Home page ^{JSON parsing and composing library home (Post)}
@lucawu @risele for some reason I don't get notifications of new posts on this thread so I just noticed them now. We switched from Schneider to Beckhoff a few years ago, and Beckhoff has their own JSON handling library. I haven't had time to do any development on PRO_JSON since last year, and it's unlikely that I will any time soon. If you or anyone else is interested in being added as an admin to this project let me know. It was an interesting project for me, and I learned a lot. I know there's people all over the world using it in different applications, but there are also a lot more options than there were when I first developed this. Maybe it's time to pass the torch to someone who's actively using it.
Last updated: 2026-03-18

Home ^{JSON parsing and composing library home (WikiPage)}
Version 1.0.18.0 Codesys SP21 Download here Codesys SP16 Download here I haven't touched this library for a while, but a couple people emailed me with bugs and feature requests, so I decided to have another crack at it. As usual, this library is released under the terms of "it's on the internet so people can do whatever the heck they want with it". Use it, modify it, copy it, put it in your own projects, contribute to it, credit me. Or not. Whatever you like. But it's free, so don't cry to me if it breaks something. If you find a bug, the best way to get my attention is with a test project showing the problem. Otherwise I have to recreate your use case manually, and I may or may not have time to do that. Release Notes 1. Significant refactoring in several places, for both efficiency and ease of understanding. Some of the code I didn't understand, and I wrote it. Added several new functions and methods. 2. Moved the version number over one decimal place, so 1.0.18.0 follows 1.0.0.16. Odd numbers in the third position will be for development versions 3. Added support for escape characters in strings 4. Input and some new functions from Fabrizio Morlino - added support for JSON5 hex values (can be enabled/disabled with GPL_JSON.JSON5 parameter) 5. STRUCT_TO_JSON - added IgnoreNull input, and removed now redundant VariableArraySize input. When IgnoreNull is true, any variable with a null value will not be composed 6. New variable JSONVAR.Format, of type JSONFORMAT, for forcing certain types to be composed or parsed in certain ways, when the underlying data type could be ambiguous 7. New flags in JSONVARINFO to help track the properties of each object 8. New function FORMAT_JSON to add white space if the Format input is true. Removed all the old white space code that only partially worked. 9. Added support for 0 based arrays. Probably any array indexes should work, but 0 and 1 have been tested 10. Significantly more test cases Known Issues 1. Multidimensional arrays do not work 2. In certain instances, it's not possible to have an unnamed object, regardless of the MaxLevels input Version 1.0.0.16 Download here Changes: 1. changes to JSONVAR.FB_Init (Simon Dreyer) 1. line 8: delete all names first before populating the array 2. line 25: when copying the string, ensure that no more than GPL_JSON.MAX_NAME_SIZE are copied, to leave a null character at the end 2. changes from discussion at https://github.com/stefandreyer/JSON-Library/issues/1 1. line 129 (End previous object): added second case for when offset < 0 (struct of struct) 3. (Stefan Dreyer) added GPL_JSON.APPLICATION_NAME for when the Application has another name than ‘Application’ 4. STRUCT_TO_JSON: 1. added check for ApplicationLevel = 0, misconfigured application name 2. reconfigured error checking and added ErrorMsg 5. JSON_TO_STRUCT 1. added check for ApplicationLevel = 0, misconfigured application name 2. reconfigured error checking and added ErrorMsg 6. STRUCT_TO_JSON: added error and message if JSONString is too small 7. JSONVAR_FB_Init: New array, added a check for the end of an array on the previous var for the case when two arrays are adjacent to each other in a struct 8. added JSONVARS_TABLE_VISU and JSONVAR_TAVLE_VISU for testing and troubleshooting 9. added some points to JSON_TO_STRUCT_VISU and STRUCT_TO_JSON_VISU 10. (Stefan Dreyer) changed STRUCT_TO_JSON line 132 closeLevel:= MaxLevel (was closeLevel:= 1) to fix bug where closing bracket was not added when MaxLevel was defined 11. changed the ASCII enum to make it a bit more readable when looking at the JSONString arrays 12. Restructuring of JSON_TO_STRUCT.Name and Value methods - some length checks added, more efficient and readable 13. Several minor stylistic changes I realize I'm bypassing the structure of the Forge platform by simply posting links to the .library files. I don't have time to make this site work with Schneider Machine Expert, which is what I primarily use for development. If you want to contribute, comment below or send me an email. This as an open source library to compose and parse JSON objects. For more information about JSON, have a look at json.org. It is a popular language used as part of many other protocols, like REST. Usage The usage is simple. You can describe a JSON file with a special structure format, which then can be stored or loaded from or to a file. Actually instead of a file, you are also able to use an HTTP Client library or s.th. similar. The example below is in the library, along with several others. //All variables must be of type JSONVAR. They can include other structures or put into arrays, as needed. TYPE EXAMPLEJSONSTRUCT : STRUCT var1: JSONVAR; var2: JSONVAR; var3: JSONVAR; obj: EXAMPLEJSONSTRUCT_1; arrayobj: ARRAY[1..3] OF JSONVAR; END_STRUCT END_TYPE TYPE EXAMPLEJSONSTRUCT_1 : STRUCT var4: JSONVAR; var5: JSONVAR; var6: JSONVAR; var7: ARRAY[1..3] OF JSONVAR; END_STRUCT END_TYPE PROGRAM ExampleJSON_PRG VAR ExampleJSONObj: EXAMPLEJSONSTRUCT; ComposeJSON: STRUCT_TO_JSON; JSONString: STRING(1000); NewJSONObj: EXAMPLEJSONSTRUCT; ParseJSON: JSON_TO_STRUCT; JSONString2: STRING(1000); END_VAR //JSONVAR variable values can be set in a number of different ways ExampleJSONObj.var1.Boolean:= TRUE; ExampleJSONObj.var2.Number:= 34.8756; ExampleJSONObj.var3.CharString:= 'teststring'; ExampleJSONObj.obj.var4.Number:= 22; ExampleJSONObj.obj.var5.AsString:= 'FALSE'; //JSONVAR will guess at type, in this case, boolean ExampleJSONObj.obj.var6.CharString:= 'qwer'; //NOTE: AsString will convert the value to/from STRING, and guess at a type, CharString will not convert, but assume it's a JSON string type. ExampleJSONObj.obj.var7[1].Number:= 123.234; ExampleJSONObj.obj.var7[2].AsString:= '55.46'; //JSONVAR will guess at type, in this case, a number ExampleJSONObj.obj.var7[3].Number:= 985; ExampleJSONObj.arrayobj[1].Number:= 1; ExampleJSONObj.arrayobj[2].Number:= 2; ExampleJSONObj.arrayobj[3].Number:= 3; //create a JSON string from example object ComposeJSON( JSONString:= ADR(JSONString), JSONStringSize:= SIZEOF(JSONString), JSONVars:= ADR(ExampleJSONObj), NumberOfVars:= SIZEOF(ExampleJSONObj) / SIZEOF(JSONVAR) ); //fill another example object with values from the created JSON string ParseJSON( JSONString:= ADR(JSONString2), JSONStringSize:= SIZEOF(JSONString2), JSONVars:= ADR(NewJSONObj), NumberOfVars:= SIZEOF(NewJSONObj) / SIZEOF(JSONVAR) );
Last updated: 2026-03-18

EThercat Dynamic configuration ^{CODESYS Forge talk (Thread)}
EThercat Dynamic configuration
Last updated: 2026-03-18

Home (version 1) discussion ^{dafalin-codesys wiki (Thread)}
Home (version 1) discussion
Last updated: 2026-03-18

(no subject) ^{JSON parsing and composing library home (Thread)}
Last updated: 2026-03-18

Post by advisoryel on CODESYS crashes when adding standard OPC UA Information Model to Communication Manager ^{CODESYS Forge talk (Post)}
Hi, I’ve seen similar issues with that CODESYS version before. It might be related to compatibility between the OPC UA information model files and the SP20 Patch 4 runtime. You could try updating to a newer service pack or patch if available, as there have been some fixes around OPC UA handling in later versions. Another thing worth trying is importing the models step by step (instead of all at once) to see if a specific file is causing the crash. Also make sure the downloaded models aren’t corrupted and match the expected schema version. Sometimes even small mismatches can cause CODESYS to crash. If nothing helps, checking the log files (if any are generated) might give a better hint about what’s failing. hollow knight
Last updated: 2026-03-20

Post by advisoryel on WebClient result empty ^{CODESYS Forge talk (Post)}
Hi, it looks like your request is actually working, since you’re getting a 200 status code, but the response seems to be incomplete when using WebClient. One possible reason is that the response stream isn’t being read fully. Sometimes WebClient returns partial data if the stream isn’t handled properly or if there’s an encoding issue. You might want to try reading the response as a full string (for example with DownloadString in WebClient, or using HttpClient instead), and also check the encoding (UTF-8). Another thing to check is whether the device requires any specific headers (like Accept: application/json), as browsers usually send more headers than a simple WebClient request. Since it works fine in the browser, it’s most likely a client-side handling issue rather than the IPX device itself. fnaf
Last updated: 2026-03-20

WebClient result empty ^{CODESYS Forge talk (Thread)}
WebClient result empty
Last updated: 2026-03-20

Post by hannibal on Codesys Trend - setting Y axis minimum and maximum as variables - error ^{CODESYS Forge talk (Post)}
Hi, It was my fault. I was using a REAL variable instead of INTEGER. Sorry for posting this.
Last updated: 2026-03-22

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