it is used in plc

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
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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.
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16. Thank You!
Thank You!