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When using NVL-send with variables declared in the structure we only see NaN (Not a Number) in the debug Window of
node-red.

1. How we supply the correct "msg.payload" for NVL-send so the output will be correct?
2. We did see some strange variable in the source code of NVL-send named "coutner" instead of "counter".

Real show up as NaN in debug window
Int show up as 0 in debug window
Strings remain empty

Is there any example available for NVL-send because we can only find example of NVL-receive?

Hi !

I've just tested your package, can't figure why it does not work :( !
Can you help me ?

On Codesys, created a NVL_Sender:

On Node-Red, created a Receiver:

But there is nothing happening

I am missing something ?
Thanks

Hello,

if I transfer a real value, the conversion works not exactly. For example -9,2 in the PLC becomes -9.199999809265137 in NodeRed. I have also tested this with positive values. 3.1 becomes 3.0999999046325684. Is this normal?

Best regards

Michael

I have an implementation of Codesys and node red on a CM4 pi module. Everything works well for some time but after 6-10 hours of 500ms updates the NVL-receive node stops responding to what appears to be valid UDP packets. No errors are thrown. I've tried changing the list ID and the node responds with invalid ID so it is working on some level. Restarting the flow, restarting the service and restarting the Codesys PLC have no impact. I have to reboot the system for it the flow to start to work properly. The attached file shows two UPD debug payloads. The first when the node isn't working. The second after rebooting the system when the node is working.

UDP debug.txt

Using NVL-send after 65535 messages the block fails with the following message {"message":"RangeError [ERR_OUT_OF_RANGE]: The value of "value" is out of range. It must be >= 0 and <= 65535. Received 65536","source":{"id":"5824328a90dffe3e","type":"nvl-send","name":"NVL_Send_13","count":1},"stack":"RangeError [ERR_OUT_OF_RANGE]: The value of "value" is out of range. It must be >= 0 and <= 65535. Received 65536\n at checkInt (internal/buffer.js:69:11)\n at writeU_Int16LE (internal/buffer.js:719:3)\n at Buffer.writeUInt16LE (internal/buffer.js:727:10)\n at nvlSender._inputCallback ....

I think the problem is that the send counter is never reset

Is it nessecary to limit the NVLs to 256 bytes? Because of technical reasons? If true, are they easy to fix?

I need to communicate with a struct, thats alone bigger than this. It would be cool, if it worked without changing the struct.