On delay timer
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Transcript of On delay timer
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WELCOME
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P.A.C.RAMASAMY RAJA POLYTECHNIC COLLEGE
DEPARTMENT OF MECHANICAL ENGINEERING
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ON DELAY TIMER
PRESENT BYG.MATHANKUMAR
142065FINAL YEAR MECHANICAL
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INDUSTRIAL AUTOMATION The use of Computerized or robotic
devices to complete manufacturing tasks.
PLANTFIELD
INSTRUMENT CONTROL SYSTEM
HARDWARE CONTROL
SOFTWARE
CONTROL
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MACHINE CAN BE CONTROLLED BY PLC WITHOUT HUMAN EFFORTS
TYPES OF AUTOMATION BUILDING AUTOMATION
Example: lifts, smoke detectors
OFFICE AUTOMATION Example: printers, cctv cameras
SCIENTIFIC AUTOMATION Example: rocket launching
LIGHT AUTOMATION Example: street solar lightening
INDUSTRIAL AUTOMATION Example: automated bottle filling
stations , steel factories etc
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INTRODUCTION• A timer can provide a delay in time operation. • Usually the duration of delay can be adjusted by changing the dial setting. • The most commonly used timer are the on delay timer and off delay timer• An on delay timer’s contact would not operate until a preset
delay time has elapsed after it is energized,• An off delay timer’s contacts will immediately operate and stay
in this active state once it is energized• But its’ contacts will only deactivate after a preset time has
elapsed once it is de-energized.
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There are very few industrial control systems that do not need at least one or two timed functions. They are used toactivate or de-activate a device after a preset interval oftime.
TIMERS
Time delay relays and solid-state timers are used to provide a time delay. They may have displays, pots or other means of operator interface for time settings and electromechanical or solid state outputs.
Time Delay Relay
Solid-StateTimer
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On-Delay Timing Relay
Operating coil
Instantaneous contacts
NO
NC
Non timed contacts are controlled directly by the timer coil, as in a general-purpose control relay.
Time control contacts
NO
NC
Time adjustment
When the coil is energized, the timed contacts are are prevented from opening or closing until the time delay period has elapsed. However, when the coil is de-energized, the timed contacts return instantaneously to their normal state.
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Normally open, timed closed contact (NOTC)
Contact is open when relay coil is de-energized
When relay is energized, there is a time delay in closing
Timed Contact Symbols
On-Delay Symbols
Normally closed, timed open contact (NCTO)
Contact is closed when relay coil is de-energized
When relay is energized, there is a time delay in opening
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Normally Open contact
Normally Open Immediate contactNormally Closed contact
Not contact
Normally Closed Immediate contactPositive Transition contactNegative Transition contact
INPUT INSTRUCTIONS
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OUTPUT INSTRUCTIONSOutput Instruction
No Operation instruction
Output Immediate instruction
Set (N bits) instructionReset (N bits) instructionSet Immediate (N bits) instructionReset Immediate (N bits) instruction
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TIMER INSTRUCTIONS
ON-DELAY TIMERRETENTIVE ON-DELAY TIMER
OFF-DELAY TIMER
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HARD-WIRED ON-DELAY TIMER
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14The program developed in Rs Logic
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15APPLICATION OF TIMER:
The timer used in many places.1) It is used in school, college, mills
etc.. To operate the bell’s.2) It is used in time Bomb’s. 3) Alarm’s in watch.
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Thank You!
Thank You!