Section 3 • Hardware Architecture

Digital In-Out Boards

The digital input - output board convert signals gener- ated by the Vission 20/20 program into 120Vac signals as well as detect external 120Vac inputs to signal 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 3-5. Digital Input-Output Board Layout.

Signal LEDs:

Marked in the diagram below in Blue or outputs and light blue for inputs. These LEDs indicate when a 120Vac output is being produced or a 120Vac signal 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 digital output board and the Vission 20/20 CPU board.

Address Dipswitches:

Marked in the diagram below in Red. These dipswitch- es are used to assign each board its address position. The addresses are binary and therefore the address of a digital output board will either be address as 4 (0100) or 5 (0101).

Figure 3-5. Digital Input-Output Board Layout

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

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Emerson 20/20 service manual Digital In-Out Boards, Digital Input-Output Board Layout

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