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Calculate the permissible number of devices on a FOUNDATION Fieldbus system using the parameters given below. Show your calculations. The power supply output is 20

Calculate the permissible number of devices on a FOUNDATION Fieldbus system using the parameters given below.

Show your calculations.

The power supply output is 20 volts
The two wires are 1 km long with 22 ohms per leg
Each device draws 20 mA
Minimum voltage at each device is 9 Volts

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