Appendix 7 terminology – Yokogawa Touch Screen GP20 User Manual
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IM 04L51B01-01EN
Appendix 7 Terminology
This section explains the terminology related to the GX/GP.
Term
Explanation
Notes
Display data
Waveform data that is displayed on the GX/GP screen. It is a recording
of measured data sampled at the display data sampling interval.
Event data
Event data is a recording of measured data at a specified recording
interval. This is separate from the display data.
Trend interval
The interval at which the waveform display is updated. The display is
updated at a time interval that corresponds to 1 dot, which is determined
by the specified recording interval (time interval that corresponds to 1
division).
See page 1-66 in section 1.6.1,
I/O channel
A collective term that refers to analog input channels (AI channels),
digital input channels (DI channels), and digital output channels (DO
channels).
AI channel
Analog input channel. Analog input channels can receive and measure
DC voltage, thermocouple (TC), RTD, and On/Off signals (DI).
DI channel
Digital input channel. Digital input channels can measure On/Off
signals.
DO channel
Digital output channel. Digital output channels can be used as relay
outputs.
GS
Input range of 1-5VDC and 0.4-2VDC signals
Input calculation
Calculation performed on inputs, such as scaling, taking the difference
between two channels (difference in relation to a reference channel),
and square rooting.
Historical trend
Waveform based on past measured data as opposed to the waveform
based on current data. The waveform display area of historical trends
shown from a memory summary, message summary, alarm summary
and so on is displayed in gray.
Color scale band
Displays a specified section (inside or outside) of the measurement
range using a color band on the scale.
Trip line
A line displayed at a specified position in the waveform display range on
the trend display.
Zone (display)
Zones enable channels to be displayed in separate areas so that
waveforms do not overlap.
Partial expanded display Partial expanded display compresses a section of the waveform display
range so that the rest of the section is expanded.
Manual sample
An action executed through a screen operation or event action function.
The action saves instantaneous values of all channels (except those set
to Skip or Off).
Snapshot
An image of the GX/GP screen saved in PNG format to an SD memory
card. Some screens cannot be saved as screenshots.
Reconfiguration
A system reconfiguration that aligns the GX/GP settings to the I/O
module configuration.
Reconfiguration is necessary when the positions of different types of
modules are changed and when modules are added or deleted.