PLC timers play a crucial role in industrial automation, allowing precise control over time-based processes.
Understanding and effectively utilizing timers can take your PLC programming skills to new heights.
In this article, we will delve into the key aspects of PLC timers and explore advanced techniques for leveraging their power.
A PLC timer is a programming element that enables the execution of specific tasks based on time intervals.
It consists of a preset value, an accumulated value, and a timer output.
Upon reaching the preset value, the timer output changes state, triggering the associated actions.
Let’s explore two common types of PLC timers: on-delay and off-delay timers.
- On-Delay Timers: An on-delay timer initiates a time delay when it receives an input signal. Once the delay elapses, the timer output activates, enabling the associated actions. On-delay timers are commonly used in applications where a delay is required before executing a particular task, such as motor start-ups or sequential operations.
- Off-Delay Timers: Unlike on-delay timers, off-delay timers activate their output immediately when receiving an input signal. However, the output remains active for a specified duration after the input signal is removed. Off-delay timers are ideal for processes that demand a delay between the input signal cessation and the deactivation of associated actions, such as motor shutdowns or safety mechanisms.