What is a Real-time system? Model of a real-time system Characteristics Types Hard time Firm TIme Soft Time

1. Real time Systems
By-
Srishti Kakade
BETA29 1

2. What is real time System
• A system is called as real time system when we
need quantitative expression of time to describe
the behavior of the system.
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3. Model of Real time System
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4. Characteristics of real time
systems
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5. 1. Time Constrains:
-Deadlines.
-Delays.
2. New Correctness Criteria:
-Logically Correct
-Accurate Result
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6. 3. Embedded:
-Sensors
-Actuators
4. Safety Criticality:
-Safe System.
-Reliable System.
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7. 5. Concurrency:
-Short and Strict Time Bounds
-Non-Deterministic
6. Distributed and Feedback System:
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8. 7. Task Criticality:
-Failure of Task
-Critical Result
8. Custom Hardware:
-Processors
-Embedded Hardware
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9. 9. Reactive:
10. Stability:
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10. 11. Exception Handling:
-The Failure should be detected and the system
should continue to operate.
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11. 1. Hard Real Time System
It is hardware or software that must operate
within the confines of a stringent deadline. The
application may be considered to have failed if it
does not complete its function within the
allotted time span.
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12. 2. Firm Real Time System
• Firm real-time systems treat information
delivered/computations made after a deadline
as invalid.
• They do not fail after a missed deadline.
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13. 3. Soft Real Time System
• A real-time task is said to be soft if generating
the output after its deadline has still some utility
for the system.
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15. 1. Industrial Applications:
-Chemical Plant Control
2. Medical:
-Robots Used in Recovery of displaced
Radioactive materials.
3. Automotive and Transportation:
-MPFI System
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