Digital Panel Indicators perform digital
processing on or conversion and display of voltages, currents, other
analog signals, and pulse signals. They can also compare input values to
set values, transfer data, and perform other functions.
Overview of Digital Panel Indicators
• The Role of Digital Panel
Indicator
Digital Panel Indicators digitally process measurement data such as analog
signals from linear sensors (including voltages and currents) and pulse
signals. It then converts and displays the data. They can also act as
interfaces (see note) by performing operations such as comparisons with
user-set values, and transmitting data to computers and PLCs.
OMRON Digital Panel Indicators have good visibility in the field, are easy
to use, are waterproof, and conform to international standards.
Communications with host computers or programmable controllers have been
improved to provide functionality for advanced information systems, such
as data collection to increase operating rates and data recording
capabilities to provide for implementing measures for PL laws and ISO.
Note: An interface is the boundary between two devices.
Analog Signals
An analog signal is signal that changes continuously.
Types: 4 to 20 mA DC
1 to 5 VDC
0 to 5 VDC
0 to 10 VDC
Infrared Thermosensor
Proximity Sensor or Rotary Encoder
A Wide Range of Voltages/Currents
Displacement, Length Measurement, or Linear Output
Sensors
Main Functions
Scaling
Scaling is a function that converts the signal output from various sensors
into physical measurement units (pressure, level, flow, etc.) before
displaying it.
There are two scaling methods, one of which sets two points: any input
value and its corresponding converted value. The other method is teaching
by actual inputs.
Position Meter
The present measurement value is displayed as a position in relation to
the scaling width on a 20-gradation position meter.
Average Processing
Average processing of input signals with extreme variations eliminates
flicker in the display and reduces the effect of noise in the input
signal.
There are two types of averages that can be used, the simple average and
the moving average.
Forced Zero
It is possible to shift the present value to
zero by selecting zero from the front-panel keys. It is useful for setting
reference values for measurement.
Timing Chart of a Forced Zero
Timing Hold
Prompted by an external timing signal, it can simultaneously measure the
maximum value, minimum value, and the difference between maximum and
minimum values.
Maximum/Minimum Hold
Holds the maximum and minimum measurement values.
Display Color Selection
The color of the PV display can be set to either green or red. It is also
possible to set the current value to change color according to the status
of the comparative output.
Bank Selection
It is possible to switch between eight comparative value banks using the
keys on the front-panel or external inputs.
Digital Panel
Indicator Glossary »
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