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Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153
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
Section 3 • Hardware Architecture