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Changing PLC Scan Rate has no effect

See original GitHub issue

Issue Description

Changing PLC Scan rate has no effect. Tags are scanned as fast as possible

Current Behavior

Tags are scanned as fast as possible

Expected Behavior

Tags should be scanned every X ms

Possible Solution (Optional)

ethernet-ip\src\controller\index.js line 433 - should be “await delay(this.state.scan_rate);”

Your Environment

  • Package version (Use npm list - e.g. 1.0.6): ethernet-ip 1.1.1
  • Node Version (Use node --version - e.g. 9.8.0):
  • Operating System and version:
  • Controller Type (eg 1756-L83E/B):
  • Controller Firmware (eg 30.11):

Issue Analytics

  • State:closed
  • Created 5 years ago
  • Comments:6 (4 by maintainers)

github_iconTop GitHub Comments

MattCostcommented, Mar 27, 2018

Yup! Working as expected now.

MattCostcommented, Mar 27, 2018 That version doesn’t have the await

const { Controller, Tag } = require("ethernet-ip");

const PLC = new Controller();

// Add some tags to group
PLC.subscribe(new Tag("TestRead")); // Controller Scope Tag

PLC.connect("", 0).then(() => {
	console.log("Connected to PLC!");
	PLC.scan_rate = 1500;
	// Begin Scanning

// Catch the Tag "Changed" and "Initialized" Events
PLC.forEach(tag => {
	// Called on the First Successful Read from the Controller
	tag.on("Initialized", tag => {
		console.log("Initialized", tag.value);

	// Called if Tag.controller_value changes
	tag.on("Changed", (tag, oldValue) => {
		console.log("Changed:", tag.value);
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