node-red-contrib-omron-fins 0.3.1

OMRON FINS Ethernet protocol functions 'Read' and 'write' for communicating with OMRON PLCs from node-red

npm install node-red-contrib-omron-fins

Overview

This is a Node-RED node module to directly interface with OMRON PLCs over FINS Ethernet protocol. For now it only supports READ and WRITE operations over FINS UDP. Tested on CV, CS, CJ, NJ and NX PLCs (the ones with FINS support)

Version Update Notes

This release (and possibly future releases up to V1.0.0) has breaking changes. Where possible, I make every attempt to keep things compatible, but as node-red improves (typedInput widgets for example) I too improve this node to make things easier or better. And sometimes, it becomes plain obvious a wrong decision was made that needs to be rectified before it becomes too late to change - it happens :) Semantic Versioning 2.0.0 will be followed after V1 however for now, where you see V0.x.y...

  • x = major / minor change
  • y = patch / bugfix

Tips

  • On a reasonable VM, I have managed to achieve polling speeds less than 10ms (100+ reads per second) HOWEVER this really taxes NODE and Node-red. Through usage and testing, this node works very well polling 10 times per second (100ms poll time). This is often more than enough for UI type applications
  • Where possible, group your items together in the PLC and do 1 large read as opposed to multiple small reads. Reading 20 WDs from 1 location is much faster than reading 20 single items. An additional benefit of reading multiple items in one poll is the data is consistent (i.e. all values were read at on the same PLC poll)

Prerequisites

  • node.js
  • Node-RED
  • git (optional) (Used for repository cloning/downloads)

Credits

Credit to Patrick Servello (patrick--) for his original implementation of FINS

Install

Pallet Manager...

The simplest method is to install via the pallet manager in node red. Simply search for node-red-contrib-omron-fins then click install

Terminal...

Run the following command in the root directory of your Node-RED install (usually ~/.node-red or %userprofile%\.node-red)

npm node-red-contrib-omron-fins

Or, install direct from github

npm install steve-mcl/node-red-contrib-omron-fins

Or clone to a local folder and install using NPM

git clone https://github.com/Steve-Mcl/node-red-contrib-omron-fins.git
npm install /source-path/node-red-contrib-omron-fins

A working example...

PLC Setup

Setting Value
IP 192.168.4.88
MASK 255.255.255.0
Node 88
UDP 9600

Node-red Setup

Setting Value
IP 192.168.4.179
MASK 255.255.255.0

FINS Connection Node Settings

Option Value
Host 192.168.4.88
Port 9600
MODE NJ/NX
ICF 0x80
DNA 0
DA1 88
DA2 0
SNA 0
SA1 179
SA2 0

image

Other notes:

  • If the subnet mask is bigger than /24 (e.g. is bigger than 255.255.255.0) you might need to enter the IP and NODE number (of the node-red server) into the FINS IP address table so that the PLC understands which IP to respond to when responding to the SA1 NODE number
  • FINS works with PLC Addresses. NJ and NX PLCs do NOT have direct addresses to addresses like DM or E0_, E1_.
    • In order to use C Series addresses in an N Series PLC, you will need to create a variable in the PLC and set its AT property. E.G. If you want to read and write 40 WDs from E0_9000 ~ E0_9039 then you need to add a TAG like this TAG_NAME ARRAY[0..39] Of WORD %E0_9000 image

Data formats and conversion

NOTE: This node returns a buffer, 16bit signed or 16bit unsigned data only. While that may seem restrictive, it was a deliberate design decision to keep the node mean and lean.

Read on...

As I use multiple PLCs and didn't want to write boolean / 32bit / float / double functionality into each node (it's best to keep things atomic and good at what they do) so I wrote a separate second node for handling data conversions.

This node "node-red-contrib-buffer-parser" https://flows.nodered.org/node/node-red-contrib-buffer-parser is capable of pretty much anything you will need for this or any PLC that returns 16bit data or a NodeJS Buffer.

In essence, you pull a bunch of data from the plc in one go & convert it all in the buffer-parser node to almost any format you could wish for (bits, floats, 32bit signed / unsigned, byteswapping etc etc). It can do 1 or many conversions all at once. It can send a grouped item (object) or individual items with a topic ready for pushing your data directly from the PLC to MQTT.

Node Info

Version: 0.3.1
Updated 2 months, 2 weeks ago
License: MIT
Rating: 5.0 2

Downloads

43 in the last week

Nodes

  • FINS Read
  • FINS Write
  • FINS Connection

Keywords

  • node-red
  • OMRON
  • FINS
  • PLC

Maintainers