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Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 2.0

Section 3 • Hardware Architecture

Digital Input Boards

The digital input board convert 120Vdc signals from ex-

ternal devices to signals for the Vission 20/20 program.

All the signals are digital in that the only two states avail-

able or either on or off. See board layout, Figure 3-4.

Signal LEDs:

• Marked in the diagram below in light Blue. These

LEDs indicate when a 120Vac input is detected.

Voltage LEDs:

• Marked in the diagram below in Orange. These LEDs

indicate the correct voltage of both the 5Vdc and

24Vdc power sources.

Communication LEDs:

• Marked in the diagram below in Green. These LEDs

show the active communications between the digital

output board and the Vission 20/20 CPU board.

Address Dipswitches:

• Marked in the diagram below in Red. These dip-

switches are used to assign each board its address

position. The addresses are binary and therefore the

address of a digital input board can only be addressed

as 3 (0011).

Figure 3-4. Digital Input Board Layout

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 261 262

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