On delay timer

on delay timer

1. WELCOME

2. P.A.C.RAMASAMY RAJA POLYTECHNIC COLLEGE DEPARTMENT OF MECHANICAL ENGINEERING

3. ON Delay timer PRESENT BY G.MATHANKUMAR 142065 FINAL YEAR MECHANICAL

4. INDUSTRIAL AUTOMATION The use of Computerized or robotic devices to complete manufacturing tasks. PLANT FIELD INSTRUMENT CONTROL SYSTEM HARDWARE CONTROL SOFTWARE CONTROL

5. 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

6. 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.

7. There are very few industrial control systems that do not need at least one or two timed functions. They are used to activate or de-activate a device after a preset interval of time. 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-State Timer

8. 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.

9. 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

10. Normally Open contact Normally Open Immediate contact Normally Closed contact Not contact Normally Closed Immediate contact Positive Transition contact Negative Transition contact Input Instructions

11. Output instructions Output Instruction No Operation instruction Output Immediate instruction Set (N bits) instruction Reset (N bits) instruction Set Immediate (N bits) instruction Reset Immediate (N bits) instruction

12. Timer instructions On-Delay Timer Retentive On-Delay Timer Off-Delay Timer

13. Hard-wired on-delay timer

14. The program developed in Rs Logic 14

15. Application 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. 15

16. Thank You! Thank You!