Digital Outputs - Emerson VILTER MicroVission Operation And Service Manual
Hide thumbs
Also See for VILTER MicroVission:
- Operation and service manual (116 pages) ,
- Retrofit manual (20 pages)
Table of Contents
Section 20 • Auxiliary I/O
Digital Outputs
The digital outputs section of the Auxiliary I/O screen
allows an operator to configure the auxiliary digital
outputs, see Figure 20-2. The digital output can be con-
figured to activate (go High, 120VAC) based on either a
digital input or a specified level on an analog input. Every
digital and analog input in the MicroVission is made
available to control a digital output.
Analog Input
Selecting the Analog Input radio button fills the Active
Input drop-down box with all available analog inputs.
One of the analog inputs can then be selected to control
the digital outputs.
Digital Input
Selecting the Digital Input radio button fills the Active
Input drop-down box with all available digital inputs.
One of the digital inputs can then be selected to control
the digital outputs.
Run Always
Selecting this checkbox enables the function that con-
trols the digital output to operate only when the com-
pressor is running or runs all the time.
N/O & N/C
Choosing
the
Normally Open (N/O) or Normally
Closed (N/C) radio buttons define what the output will
be above or below the trigger value. In the N/O setting,
the output will be off (0VAC) while the input value is be-
low the trigger value. In the N/C setting, the output will
be high (120VAC) while the input value is below the trig-
ger value.
Analog Trigger
The analog trigger toggles the digital output based on
a specified value plus the specified differential value.
These options will be available only when Analog Input
is selected.
Analog Trigger value
This defines the specified value in which the output will
toggle. This is an absolute value and not based on units.
For example, 100 could mean temperature or pressure
depending on the type of input selected.
Differential
This is the differential around the trigger value. For ex-
ample, if a trigger value of 100 is entered with a differen-
tial of 1, then as the value increases to 101, the output
will be triggered. If the value decreases to 99, then the
output will be toggled in the opposite direction.
Enable Timer
Selecting this checkbox enables the function that con-
trols the digital output when activated based on the ON
Time and OFF Time.
20 – 2
Timers
ON Time: This defines the ON Time for the digital output
when it is activated.
OFF Time: This defines the OFF Time for the digital out-
put when it is activated.
For example, if an analog input is selected with a trig-
ger value of 100 and differential of 1 and ON Time and
OFF Time of 1 min each and N/O setting, then as the
analog input value increases to 101, the output will be
high (120VAC) for 1 min and then the output will be low
(0VAC) for 1 min. The output will keep on toggling from
high to low and then low to high until the analog input
value decreases to 99.
Latching
Latching can be of two types; one is with timer and an-
other is with the digital input.
Latching with Digital Input: The below truth table is for
the latching with digital input. When both Active Input
& Latching Input are LOW, the output would be LOW.
When Active Input is HIGH, the output would be HIGH.
Now if Active Input is turned LOW when Latching Input is
HIGH, the output would stay HIGH until Latching Input is
turned LOW i.e. the output would be Latched.
Active Input
Latching with Timer: The below truth table is for the
latching with timer. When Active Input is LOW, the
output would be LOW. When Active Input is HIGH, the
output would be HIGH. Now if Active Input is turned
LOW turn Latching Timer would become active. The
output would remain HIGH till the time Latching Timer
is Running i.e. the output would be Latched. Once the
Latching Timer is Lapsed, the output would go LOW.
Active Input
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
Latching Input
0
0
0
1
1
1
0
1
0
0
Timer
0
No Timer
1
No Timer
0
Run Timer
0
Expired Timer
Output
0
0
1
1
0
Output
0
1
1
0
Table of Contents
