Is node-red able to send an media value of the data that is receiving from a PLC. For example to know the speed that the robot has been working during the day. So one value has been changing all day and at the end of the day I want to know the media value can I do it with node-red?

Yes. The inject node can be scheduled to repeat every 24 hours. When the node fires use your existing code to retrieve data from the robot. If the robot can make an http call to send data to node-red you can start the flow with an http node. How you process the data in node-red is another topic d…

I connect the robot with the node -red via s7 node because I have a PLC, but I don´t know how to connect inject with the s7 node to notify the value when I set it in the inject. Any example? Thank you

By media value do you mean the average (median)? If so then you could feed the values into a function node and keep a running total and a count in the node context, then at the end of the day you can get the median.

yes okey and do you know which command do I need to put? I am new at this tings sorry :sweat_smile:

Looks like the s7 node supports inbound communication. Is you PLC able to communicate via ethernet? Is the computer running plc programmer also running node-red? Node-red configurqtion suggestions. https://flows.nodered.org/node/node-red-contrib-s7 The node-red code appers to be writting on top of…

yes I can see the PLC signals in node red but I want to receive a notification of the average value of motor sepeed for example durimg the day and I don´t know what to do for that

Are you able to get the motor speed? Also, is the PLC able to work out the median for you?

but the value changes during the day so I want to calculate with NOde-red the average value and then send a notification

so have one flow that calculates the average value and stores it as a context value. Have another flow triggered at the end of the day that gets the context value and resets the average. Context values are explined in the documentation and there are examples in the cookbook

There is a calculator node that will perform averages https://flows.nodered.org/node/node-red-contrib-calc . Takes an array so you will need to capture speed value from the robot and add to array. Simplistic example. Use your s7 node. Set interval to read speed variable. I assume speed value appear…

Diary data average value

General

bohtho 27 March 2019 20:25 12

Or use the node-red-contrib-smooth node if you want the running mean/average of a certain number of incoming payloads.

Topic		Replies	Views
Average using Function node General function-node	13	748	7 November 2022
Nodes suggestion for timed rolling average and desynchronised sum General	46	13587	24 November 2024
How can I take average of modbus datas? Industrial	2	521	2 November 2021
Hello all , I want your help in adding two consecutive msg.payload array[] and then finding running average for latest value + stored value General	27	1551	23 April 2022
How can I count the running hours of a machine (PLC, S7) Industrial	18	1689	4 July 2022

Diary data average value

Related topics