Emerson Vilter Vission 20/20, Operation And Service Manual

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Section 3 • Hardware Architecture
Vission 20/20 • Operation and Service Manual • Emerson • 35391SC 2.7
Digital In-Out Boards
The digital input - output board converts 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 are either on or off. See board layout, Figure 3-7.
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
indicate the correct voltage of both the 5V DC and
24V DC 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 4 (0100)
or 5 (0101).
Figure 3-7. Digital Input-Output Board Layout