The document discusses starting a motor using a PLC and different timer instructions for PLCs. It describes hard-wired direct-on-line starting using contactors and overload protection. It then explains how to start and stop a motor using input and output connections to a PLC, including on-delay, retentive on-delay, and off-delay timer instructions. On-delay and retentive on-delay timers count time when an enabling input is on and turn their timer bit on when the current time exceeds the preset time. The retentive on-delay timer maintains its current value while the on-delay timer resets its value when the input turns off.

1. Input contacts example
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2. Output instructions
Output Instruction
Output Immediate instruction
No Operation instruction
Set (N bits) instruction
Reset (N bits) instruction
Set Immediate (N bits) instruction
Reset Immediate (N bits) instruction
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3. Output, Set & Reset example
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4. Starting a motor
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5. Hard-wired DOL(direct-on-line ) starting
O.L. contact
Circuit Breaker
Contactor
Thermal
Overload
Star
t
Stop
Aux. contact
Contact coil
Induction
Motor
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Induction Motor

6. Using PLC
Before start
Starting
After start
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7. Stopping
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8. Input & Output connections
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9. Timer instructions
On-Delay Timer
Retentive On-Delay Timer
Off-Delay Timer
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10. On-Delay & Retentive On-Delay timers
They count time when the enabling input (IN) is
ON. When the current value (Txxx) is > the preset
time (PT), the timer bit is ON.
The On-Delay timer current value is cleared when
(IN) is OFF, while the current value of the Retentive
On-Delay Timer is maintained.
You can use the Retentive On-Delay Timer to
accumulate time for multiple periods of the input ON.
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