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abb_libegm

README.md

abb_libegm

Important Note

Please note that this package has not been productized, it is provided "as-is" and only limited support can be expected.

Overview

A C++ library for interfacing with ABB robot controllers supporting Externally Guided Motion (EGM). See the Application manual - Controller software IRC5 for a detailed description of what EGM is and how to use it.

  • See abb_librws for a companion library that interfaces with Robot Web Services (RWS).
  • See StateMachine Add-In for an optional RobotWare Add-In that can be useful when configuring an ABB robot controller for use with this library.

Sketch

The following is a conceptual sketch of how this EGM library can be viewed, in relation to an ABB robot controller as well as the RWS companion library mentioned above. The optional StateMachine Add-In is related to the robot controller's RAPID program and system configuration.

EGM sketch

Requirements

  • RobotWare version 7.x.
  • A license for the RobotWare option Externally Guided Motion (689-1).

Dependencies

Limitations

This library is intended to be used with the UDP variant of EGM, and it supports the following EGM modes:

  • Joint Mode
  • Pose Mode
  • Lead Through Mode (only for collaborative robots)

Recommendations

  • This library has been verified to work with RobotWare version 7.3.1. Other versions are expected to work.
  • It is a good idea to perform RobotStudio simulations before working with a real robot.
  • It is prudent to familiarize oneself with general safety regulations (e.g. described in ABB manuals).
  • Consider cyber security aspects, before connecting robot controllers to networks.

Usage Hints

This is a generic library, which can be used together with any RAPID program that is using the RAPID EGMRunJoint and/or EGMRunPose instructions, and system configuration. The library's primary classes are:

  • UDPServer: Sets up and manages asynchronous UDP communication loops. During an EGM communication session, the robot controller requests new references over a UDP channel, at the rate specified with RAPID EGMAct instructions. When an UDPServer instance receives an EGM message from the robot controller the message is passed on to an EGM interface instance (see below). The interface is expected to generate the reply message, containing the new references, which the server then sends back to the robot controller.
  • AbstractUDPServerInterface: An abstract interface, which specifies how to interact with the UDPServer class. Can be inherited from to implement custom EGM interfaces.
  • EGMBaseInterface: Inherits from AbstractUDPServerInterface, encapsulates an UDPServer instance, and implements a basic EGM interface. Can be configured to use demo references, which are intended for testing that EGM communication channels works.
  • EGMControllerInterface: Inherits from EGMBaseInterface and implements an EGM interface variant for execution inside an external control loop that needs to be implemented by the user. Provides interaction methods, which can be used inside external control loops to affect EGM communication sessions.
  • EGMTrajectoryInterface: Inherits from EGMBaseInterface and implements an EGM interface variant for execution of a queue of trajectories. Provides interaction methods, which can be called by a user to for example add trajectories to the queue and to stop/resume the trajectory execution.

The optional StateMachine Add-In for RobotWare can be used in combination with any of the classes above.

StateMachine Add-In [Optional]

The purpose of the RobotWare Add-In is to ease the setup of ABB robot controllers. It is made for both real controllers and virtual controllers (simulated in RobotStudio). If the Add-In is selected during a RobotWare system installation, then the Add-In will load several RAPID modules and system configurations based on the system specifications (e.g. number of robots and present options).

The RAPID modules and configurations constitute a customizable, but ready to run, RAPID program which contains a state machine implementation. Each motion task in the robot system receives its own state machine instance, and the intention is to use this in combination with external systems that require interaction with the robot(s). The following is a conceptual sketch of the RAPID program's execution flow.

To install the Add-In:

  1. Go to the Add-Ins tab in RobotStudio.
  2. Search for StateMachine Add-In in the RobotApps window.
  3. Select the Add-In and retrieve the Add-In by pressing the Add button.
  4. Verify that the Add-In was added to the list Installed Packages.
  5. The Add-In should appear as an option during the installation of a RobotWare system.

See the Add-In's user manual for more details, as well as for install instructions for RobotWare systems. The manual can also be accessed by right-clicking on the Add-In in the Installed Packages list and selecting Documentation.

Notes

If the EGM option is selected during system installation, then the Add-In will load RAPID code for using EGMRunJoint and EGMRunPose RAPID instructions. System configurations will also be loaded, and it is important to update the robot controller's EGM configurations. Especially the Remote Address and Remote Port Number configurations, under the Transmission Protocol topic, are vital to edit so that the robot controller will send EGM messages to the correct host address. This configuration can be found in RobotStudio -> Controller tab -> Configuration -> Communication -> Transmission Protocol -> Edit each ROB_X instance. There will be one instance for each robot in the system.

The RWS companion library contains a class specifically designed to interact with the StateMachine Add-In. It allows for example to control the RAPID program by starting and stopping EGM communication sessions.

Acknowledgements

his work is based on the abb_libegm classes developed by Jon Tjerngren for ABB IRC5 controllers (running RobotWare 6.x)