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. The digital input can be confi gured to
produce an alarm, a trip, and an inhibit on either a high
or low input. A low input is 0vac and a high is 120vac on
the enabled input. Leaving all options in their default set-
ting 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)