var app = angular.module('plunker', ['ngTagsInput']);

app.config(function(tagsInputConfigProvider) {
  tagsInputConfigProvider.setDefaults('tagsInput', {
    placeholder: 'New tag',
    removeTagSymbol: '✖'
  })
});

app.controller('MainCtrl', function($scope) {
  $scope.tags1 = ['Tag 1', 'Tag 2']  ;
  $scope.tags2 = ['Tag 3', 'Tag 4', 'Tag 5']  ;
  $scope.tags3 = ['Tag 6'];
});
<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="http://mbenford.github.io/ngTagsInput/css/ng-tags-input.min.css" />
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.2/angular.min.js"></script>
    <script src="http://mbenford.github.io/ngTagsInput/js/ng-tags-input.min.js"></script>
    <script src="app.js"></script>
  </head>

  <body ng-controller="MainCtrl">
    <tags-input ng-model="tags1"></tags-input>
    <tags-input ng-model="tags2"></tags-input>
    <tags-input ng-model="tags3"></tags-input>
  </body>

</html>