The Digital Control System
e(kt)
r(t) c(t)
G(s)
ADC
+
DAC
D(z)
Controller
Sensor
Actuator
Process
Advantages Considerations
• Sample rate
• Quantization
• Ease of programming
• Controller design
• Cost
• Processor selection
• Requires data converters
• Numeric issues
• Immunity from environmental effects
• Advanced control strategies possible
• Immunity from component errors
• Improved noise immunity
• Ability to modify and store control parameters
• Ability to implement digital communications
• System fault monitoring and diagnosis
• Data logging capability
• Ability to perform automated calibration
Digital Processor
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