🔍 Key Concepts
• On-delay timer (TON) operation: how long after the input turns ON does the timer output change?
• Difference between on-delay, off-delay, and pulse functions in PLCs
• How the timing diagram in figure B shows the relationship between In 1, Out 1, and the Timer signal
💭 Think About
• Look at when Out 1 becomes active compared to In 1. Does Out 1 turn on immediately with In 1, or only after some time has passed?
• Check what happens when In 1 turns OFF. Does Out 1 turn off right away, stay on for a delay, or produce only a short burst?
• Compare the shape and duration of Out 1 with the short pulse on In 1. Is the timer extending, delaying, or repeating the signal?
✅ Before You Answer
• Verify whether Out 1 turns ON only after the timer has finished counting or whether it turns ON immediately.
• Confirm if Out 1 remains ON after In 1 goes OFF, and for how long, by reading the timing diagram carefully.
• Match the behavior you see (delay before ON, delay before OFF, cycling, or a single stretched pulse) to the standard PLC timing types: on-delay, off-delay, on-off cycle, or pulse.