Section 20 • Auxiliary I/O Overview; Digital Inputs - Emerson VILTER MicroVission Operation And Service Manual

Section 20 • Auxiliary I/O
Overview
The Auxiliary Input/Output (I/O) section of the
MicroVission gives the operator flexibility to add pe-
ripheral instruments and/or devices such as motors,
valves and solenoids. With these additions, customer
configurable I/O's are useful to expand the functions of
the MicroVission where it was not explicitly designed to
control.
Setting up one or more of the auxiliary inputs or out-
puts starts with the configuration screen. To enable the
Auxiliary I/O's, the MicroVission must first be equipped
with one of the available expandable I/O cards, and the
card must be selected on page 8 of the configuration
screen. Once the appropriate card is available, then the
operator will be permitted to enable and name the de-
sired auxiliary I/O. The operator can then navigate to the
Auxiliary I/O screen where the operation of that I/O can
be defined.

Digital Inputs

The Digital Inputs section of the auxiliary I/O allows an
operator to configure the auxiliary digital inputs, see
Figure 20-1. The digital input can be configured to pro-
duce 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
setting will mean no action will be taken on an enabled
input. The input will simply be available to view at the
panel or by communications.
Figure 20-1. Auxiliary I/O Screen - Digital Inputs (Page 1)
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
Trip/Alarm Check
Selecting this checkbox enables the alarms and/or
trip functions of the MicroVission for the desired
digital input. The accompanying drop-down box
gives the operator the flexibility to choose whether
the alarm and/or trip occurs if the input is high or
low.
Inhibit Check
Selecting this checkbox enables the inhibit function of
the MicroVission for the desired digital input. An inhibit
check prevents the compressor from starting if there ex-
ists a condition where a trip will shut down the compres-
sor after it starts. The inhibit can be selected to act on
a high or low input and can be selected to work with or
without the alarm and trip function.
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