Edit in JSFiddle

angular.module("module_A", [])
.controller("controller", [function(){
	var self = this;
  self.text = "A";
}])

angular.module("module_B", [])
.controller("controller", [function(){
	var self = this;
  self.text = "B";
}]);

angular.bootstrap(document.getElementById("module_1"), ["module_A"]);
angular.bootstrap(document.getElementById("module_2"), ["module_A"]);
angular.bootstrap(document.getElementById("module_3"), ["module_A", "module_B"]);

<div id="module_1">
  module_1:
  <div ng-controller="controller as ctrl">
    <input type="text" ng-model="ctrl.text"/>
  </div>
</div>

<div id="module_2">
  module_2:
  <div ng-controller="controller as ctrl">
    <input type="text" ng-model="ctrl.text"/>
  </div>
  
   <div ng-controller="controller as ctrl">
    <input type="text" ng-model="ctrl.text"/>
  </div>
</div>

<div id="module_3">
  module_3:
  <div ng-controller="controller as ctrl">
    <input type="text" ng-model="ctrl.text"/>
  </div>
  
  <div ng-controller="controller as ctrl">
    <input type="text" ng-model="ctrl.text"/>
  </div>
</div>