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Internal Circuit Diagram
Figure 3
Internal wiring of the terminal points
Key:
Protocol chip
O P C
Optocoupler
Microprocessor
Electrically erasable, reprogram-
mable read-only memory
Microprocessor monitoring
6226B_GE
ANALOG IN 15 BIT VOLTAGE/CURRENT 8CH IC220ALG221
Power supply unit with electrical
isolation
Reference voltage source
Analog-to-digital converter
Amplifier
Multiplexer
3
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