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FIG. 71 – DIGITAL INPUTS / OUTPUTS TEST SCREEN
This diagnostic is used to analyze the digital inputs and
outputs of the Microboard. Refer to description of I/O
Board in Section 4 of this book.
The state of each Microboard Digital Input, Pro gram
Jumper and Program DIP Switch, as in ter pret ed by the
Microboard, is depicted by an LED. If the Microboard
interprets its input as being at a Logic Low (<1.0VDC)
level, the LED is illuminated. If in ter pret ed as being
at a Logic High (>4.0VDC) level, the LED is ex tin -
guished.
The state of the Microboard's intended drive sig nals
to each of the Relays on the I/O Board is de pict ed by
an LED. If the intended output is a Logic Low level
(<1.0VDC), the LED is illuminated. If the intended
out put is a Logic High level (>10.0VDC), the LED is
ex tin guished. Logic Low outputs en er gize the Relays.
Logic High outputs de-energize the Relays. The state of
any output can be manually set to either the EN ABLED
(Logic Low) or DISABLED (Logic High) state.
PROCEDURE
Digital Inputs:
1. The Digital Inputs are listed on this screen ac-
cord ing to a.) Terminal number on the I/O Board
and b.) Microboard Program Jumpers and Pro gram
DIP Switch es. Figure 14 shows the de vic es con-
YORK INTERNATIONAL
DIGITAL INPUTS / OUTPUTS TESTS
nect ed to these terminals. Tables 1 and 2 list the
functions of the Program Jumpers and Switch es.
2. With 115VAC applied to a particular I/O Board
Dig i tal Input, the applicable LED should be il-
lu mi nat ed. If the LED is not illuminated, perform
appropriate Troubleshooting procedure be low.
3. With 0VAC applied to a particular I/O Board Dig i tal
Input, the applicable LED should be ex tin guished.
If the LED is not extinguished, perform ap pro pri ate
Trou ble shoot ing procedure below.
4. If a Program Jumper is present, the applicable
LED should be extinguished. If the LED is not
ex tin guished, the Microboard is defective.
5. If a Program Jumper is not present, the ap pli ca ble
LED should be illuminated. If the LED is not il-
lu mi nat ed, the Microboard is defective.
6. If a Program Switch (DIP) is in the ON position, the
applicable LED should be illuminated. If the LED
is not illuminated, the Microboard is de fec tive.
7. If the Program Switch (DIP) is in the OFF po si tion,
the applicable LED should be extinguished. If the
LED is not extinguished, the Microboard is de-
fec tive.
8. When all desired tests have been performed, press
DIAGNOSTICS key to return to MAIN DI AG -
NOS TICS Screen.
FORM 160.54-M1(503)
00340VIP
159
24
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