Timer Instruction in Delta PLC/ ON Delay & Off delay Timer / Industrial Automation

Описание: Timer Instruction in Delta PLC/ ON Delay & Off Delay Timer.
How Many Types Of Timer.
Why We Use Timer in Delta PLC.
How Its Work Timer In Delta PLC.

🔹What is a Timer in PLC?
A timer in a PLC is an instruction used in ladder logic programming to measure time intervals. It starts counting when triggered and stops once the preset time is reached. Timers are essential for automation tasks like delays, sequencing, and scheduled operations.

🔹 Types of Timers in Delta PLC
Delta PLCs generally provide two main categories of timers:

Type Description Use Case Example
On-Delay Timer (TON) Starts timing when input turns ON; output activates after preset time. Motor start delay, conveyor sequencing
Off-Delay Timer (TOF) Starts timing when input turns OFF; output remains ON for preset time before turning OFF. Keeping a fan running after motor stops
Retentive Timer (RTO) Accumulates time across multiple cycles until reset. Tracking machine run-time
High-Speed Timers Operate with very small time bases (1 ms). Precise operations like packaging or cutting
Low-Speed Timers Operate with larger time bases (10 ms, 100 ms). General automation delays
Delta PLC timers can be configured with time bases of 1 ms, 10 ms, or 100 ms depending on the required precision.

🔹 How Timers Work in Delta PLC
Preset Value (S2): The target time you set (e.g., 50 counts).

Time Base: Defines the unit of counting (e.g., 100 ms).

Present Value (PV): The current count that increases until it matches the preset.

Output: Activates once PV = Preset.

👉 Example:
If you set T0 = 50 with a 100 ms time base, the timer will reach the preset after:

50
×
100
 
ms
=
5000
 
ms
=
5
 
seconds
So, the output turns ON after 5 seconds.

🔹 Practical Applications
Delay start/stop of motors or pumps

Sequential control in conveyor systems

Safety interlocks (e.g., ensuring a process runs for a minimum time)

Packaging machines for precise timing

Would you like me to create a ladder logic example (with TON or TOF) for Delta PLC so you can see exactly how it looks in programming?

Here’s a clear explanation of timers in Delta PLCs:

🔹 What is a Timer in PLC?
A timer in a PLC is a programming instruction that measures time intervals. It starts counting when triggered and stops once the preset time is reached. Timers are widely used for delays, sequencing, and scheduled operations in automation systems. In Delta PLCs, timers count from zero until the Present Value (PV) equals the Preset Value (S2), based on a chosen time base (1 ms, 10 ms, or 100 ms