Retentive On Delay timer | Siemens LOGO PLC | PLC Training скачать в хорошем качестве

Retentive On Delay timer | Siemens LOGO PLC | PLC Training

Retentive On Delay timer for Siemens LOGO PLC The Retentive On Delay (TONR) timer is a crucial function block in Siemens LOGO! PLCs, designed to delay an output signal for a specified duration after an input signal is received, while retaining its accumulated time value even if the input signal is temporarily interrupted. This is particularly useful in applications where precise timing and memory of elapsed time are critical, such as in industrial automation processes. Key Features of Retentive On Delay Timer (TONR): Time Retention: Unlike non-retentive timers, the TONR retains the accumulated time when the input signal goes off. When the input signal returns, the timer resumes from where it left off rather than resetting to zero. Parameter Settings: PT (Preset Time): The total delay time you set for the timer. ET (Elapsed Time): Displays the time that has elapsed since the timer started. Functionality: Activation: When the input signal to the TONR block is activated, the timer starts counting. Interruption Handling: If the input signal is interrupted before the preset time is reached, the accumulated time is retained. Completion: When the input signal is reactivated, the timer continues counting from the retained time until the preset time is reached. Once the preset time is achieved, the output signal is activated. Use Cases: Industrial Automation: Ensuring machines resume operation smoothly after temporary stops. Process Control: Managing processes that require precise timing intervals, even with intermittent inputs. Sequential Operations: Implementing steps in sequences that must retain their state despite power fluctuations or signal interruptions. Example Application: Consider a conveyor belt system where packages need to be moved after a specific delay. If the system halts temporarily (e.g., for safety checks or manual intervention), the Retentive On Delay timer ensures that the delay time does not reset. When the system restarts, the timer resumes from where it paused, maintaining the correct timing for package movement. Implementation in Siemens LOGO! PLC: In Siemens LOGO! Soft Comfort software, the TONR block can be easily configured: Drag and drop the TONR block into your program. Set the desired preset time (PT). Connect the input signal that will trigger the timer. Monitor the elapsed time (ET) and output signal to verify proper operation. By using the Retentive On Delay timer, you enhance the reliability and accuracy of time-dependent processes, making it an indispensable tool in various automation and control applications.