Writing setpoints via Node-RED

Node-RED
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1

I’m just getting started with Node-RED.

Before I start manipulating any values, I wanted to ask where they’re written to and whether there’s anything I need to bear in mind.

From my microcontroller days, I know that flash memory shouldn’t—or mustn’t—be written to with individual values at intervals of less than a second.

Where is this stored if I regularly write the grid setpoint via a calculation in Node-RED? RAM would be harmless, but if the value is written to the flash disk each time, I’d want to send only one message per minute.

Are there any guidelines?

2

There is no point in using such a fast rate, the system cannot respond in that time. I wouldn’t be updating more often than every 5 seconds or so.
Modern flash shouldn’t have an issue with updating like that.

3

I’m making a note:

There are no guidelines.

1/5s isn’t a problem.

So my planned 1/min should be well within the safe limit.

Background to the question:

Node-RED likes to update at 10/s if you leave “everything at default”.

4

Zusätzlich Filter Node, um nur Wertänderungen zu schreiben zur weiteren Reduktion um unnötige Schreibvorgänge.

5

Regardless, even if theoretically an unlimited number of writes should be allowed, I usually put a Filter node (write only on change) before settings like these in Node-RED. It can’t hurt and usually cuts the number of writes dramatically.