I'm having a problem with Modbus and data display.
(I'm a beginner, but I think I understand the basics of Node-RED.)
When I send a query of several words to a PLC, the data arrives correctly (in an array), it's accurate, and it appears in the debug window without any issues.
However, I can't get the value, for example, [1] from the word table to display in a numeric field.
Could you please explain why? It works in debug mode but not in the dashboard, as a numeric type.
From looking at this fragment of your screencapture:
I think you are using the original node-red-dashboard extension.
Be aware that the original dashboard is deprecated, and if you are new to Node-red you should probably consider working with an alternative such as @flowfuse/node-red-dashboard, which is sort of the official replacement.
Other dashboard extensions are available too.
If you were to pass your array to a dashboard text widget you would see both elements
Further, you have told it, if a number is entered, to set msg.topic to msg.payload[1], which I suspect was clutching at straws trying to get it to work!
I suggest that you would benefit from watching this playlist: Node-RED Essentials. so that you know more about messages and their properties.
How can you fix it?
Unless you switch to the new dashboard, your best bet is to use a change node to set msg.payload to msg.payload[1] before you pass it to the numeric input node.
But is a numeric input widget the right one? Are you allowing the user to change the value, or just displaying it?
Perhaps a text node is all you need, set to display msg.payload[1]
