Tutorial on Logging Out of ABB Collaborative Robot Controller Using Python

1. Tutorial Background and Core Purpose

Prerequisites: This tutorial is based on the operations completed in the previous lesson — the RWS library file content has been adjusted (the controller connection protocol has been changed to a more securehttps), and the library version has been updated to “0826”. It is also necessary to ensure that the robot controller has been successfully connected and verified.
Core Purpose: To address the resource consumption issue of the robot controller. Repeated access to the controller can consume its resources, potentially leading to poor responsiveness, and the robot may need to respond to other network demands. Therefore, after each access, it is necessary to perform the “log out” operation to release resources and ensure the stable operation of the controller (especially suitable for scenarios with low sampling frequencies, such as accessing once every minute or ten minutes).

Core Method Used: Call thelog out method from the RWS library (version 0826). This method does not require return values or parameters; it only needs to be called to trigger the log out operation, disconnecting from the controller.
Dependency Library: It relies on the third-party libraryrequest, which provides related functions insection to verify whether the log out was successful (if successful, it prompts “Successfully logged out of the current session”; if failed, it prompts “An error occurred during the log out process”).

Prepare the Code Environment: In the Python code of the main functionmain (the main program entry) where the robot connection has been established, find the code location after a successful connection, leave a blank line, and mark it with an asterisk comment (for future expansion purposes). Ensure that the instantiation of the class to whichlog out belongs has been completed (the instantiated object exists inlogo).
Call the Log Out Method: Write the log out code below the comment; this code should immediately follow the logic of successful connection, forming a complete process of “connection – business operation – log out”.
Execute and Verify:

Open the robot controller in advance, run the code, and ensure that the previous steps (type reading, overall data reading, text prompt “Successfully connected”) are executed normally.
When the code reaches thelog out related statement (in the example, it is line 37), if the console outputs “Successfully logged out of the current session”, it indicates that the log out operation is complete, the controller resources have been released, and the entire process has ended.

Operation Sequence: The successful connection and verification of the robot controller must be completed before executing thelog out operation; the connection step cannot be skipped to perform log out.
Method Characteristics: Thelog out method has no return value and no parameters; it is only necessary to ensure that the class instantiation is correct (i.e., thelogo object has been successfully created) to avoid method call failures due to missing instantiation.
Scenario Adaptation: Although the log out operation can release resources, the specific timing of “when to connect and when to log out” should be deployed according to actual business needs, and frequent connection and log out operations should not be performed blindly.