Service manual

18 – 1
Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.9
Section 18 • Auxiliary Input / Output
Overview
The Auxiliary Input/Output (I/O) section of the Vission
20/20 gives the operator fl exibility to add peripheral
instruments and/or devices such as motors, valves and
solenoids. With these additions, customer confi gurable
I/Os are useful in expanding the functions of the Vission
20/20 where it was not explicitly designed to control.
Setting up one or more of the auxiliary inputs or out-
puts start with the confi guration screen. In order to en-
able the auxiliary I/O, the Vission 20/20 must fi rst be
equipped with one of the available expandable I/O cards
and the card must be selected on page 6 of the confi gu-
ration screen. Once the appropriate card is available,
then the operator will be permitted to enable and name
the desired auxiliary I/O. The operator can then navigate
to the Auxiliary I/O screen where the operator can defi ne
how that I/O will operate.
Digital Inputs:
The Digital Inputs section of the auxiliary I/O allows an
operator to confi gure the auxiliary digital inputs, see
Figure 18-1. Auxiliary I/O Screen - Digital Inputs (Page
1). The digital input can be confi gured to produce an
alarm, a trip, and an inhibit on either a high or low in-
put. A low input is 0vac and a high is 120vac on the en-
abled input. Leaving all options in their default setting
will mean no action will be taken on an enable input. The
input will simply be available for viewing at the panel or
by communications.
Trip/Alarm Check:
• Selecting this checkbox enables the alarms and/or
trip functions of the Vission 20/20 for the desired
digital input. The accompanying drop-down box
gives the operator the fl exibility to choose whether
the alarm and/or tip occurs if the input is high or low.
Inhibit Check:
• Selecting this checkbox enables the inhibit function
of the Vission 20/20 for the desired digital input. An
inhibit check prevents the compressor from starting
if the condition is true where a trip will shut down
the compressor after it as started. The inhibit can be
selected to inhibit on a high or low input and can be
selected to work with or without the alarm and trip
function
Figure 18-1. Auxiliary I/O Screen - Digital Inputs (Page 1)