Section 3 • Hardware Architecture

Digital Input Boards

The digital input board convert 120Vdc signals from ex- ternal devices to signal 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. Digital Input Board Layout.

Signal LEDs:

Marked in the diagram below in light Blue. These LEDs indicated when a 120Vac input is detected.

Voltage LEDs:

Marked in the diagram below in Orange. These LEDs indicated 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 digi- tal 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 therefor the address of a digital input board can only be addressed as 3 (0011).

Figure 3-4. Digital Input Board Layout

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Emerson 20/20 service manual Digital Input Boards, Digital Input Board Layout

20/20 specifications

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