Description
EPSCPE100-ABAE General Electric of the United States
EPSCPE100-ABAE General Electric of the United States
Module Clips Drive controller servo moto
EPSCPE100-ABAE General Electric of the United StatesSuitable for steel manufacturing, thermal power generation, hydroelectric power generation, nuclear power generation, wind power generation, gas supply, and other glass manufacturing, paper mills, mechanical manufacturing, electronic manufacturing, automotive manufacturing, aviation manufacturing, chemical manufacturing, coal mining and selection, oil and natural gas mining and selection, metal mining and selection, and non-metallic mining and selection
2. Capacitive touch screen
2.1 Capacitive technology touch screen
It works by using the human body”s current induction. The capacitive touch screen is a four-layer composite glass screen. The inner surface
and interlayer of the glass screen are each coated with a layer of ITO. The outermost layer is
a thin layer of silica glass protective layer. The interlayer ITO coating serves as the working surface. Four electrodes are drawn out, and the
inner ITO layer is a shielding layer to ensure a good working environment. When a finger touches the metal layer, due to the electric field of the
human body, a coupling capacitance is formed between the user and the touch screen surface. For high-frequency current, the capacitance is a
direct conductor, so the finger draws a small current from the contact point. This current flows out from
the electrodes on the four corners of the touch screen, and the current flowing through these four electrodes is proportional to the distance from the
finger to the four corners. The controller obtains the position of the touch point by accurately calculating the ratio of these four currents. .
2.2 Defects of capacitive touch screen
The light transmittance and clarity of the capacitive touch screen are better than the four-wire resistive screen, but of course it cannot be compared with
the surface acoustic wave screen and the five-wire resistive screen. The capacitive screen is seriously reflective, and the four-layer composite
touch screen with capacitive technology has uneven transmittance of light of various wavelengths, causing color distortion. Due
to the reflection of light between the layers, the image characters are also blurred . In principle, capacitive screens treat the human body as a
capacitorOne electrode of the component is used. When a conductor is close to the interlayer ITO working surface and a capacitor of sufficient capacitance
is coupled, the current flowing away is enough to cause the capacitive screen to malfunction. We know that although the capacitance value is inversely proportional to
the distance between the poles, it is directly proportional to the relative area, and is also related to the insulation coefficient of the medium. Therefore, when a larger area of the
palm or a conductive object is held close to the capacitive screen instead of touching it, it can cause the capacitive screen to malfunction. In humid weather, this situation is
particularly serious. Putting your body within 15 cm of the monitor can cause the capacitive screen to malfunction. Another disadvantage of capacitive screens is that they do not
respond when touched with a gloved hand or a non-conductive object, due to the addition of a more insulating medium. The main disadvantage of the capacitive screen is drift:
when the ambient temperature and humidity change,
and the environmental electric field changes, it will cause the capacitive screen to drift, causing inaccuracy. For example, the temperature rise of the monitor after turning on the
screen will cause drift: when the user touches the screen while the other hand or side of the body is close to the monitor, it will drift; larger objects near the capacitive touch
screen will drift after being moved, and if there are people around to watch when you touch the screen, it will drift. It will cause drift; the reason for the drift of the capacitive
screen is an inherent technical shortcoming. Although the environmental potential surface (including the user”s body) is far away from the capacitive touch screen, it is much
larger than the finger area. They directly affect the determination of the touch position. . In addition, many relationships that should be linear in theory are actually non-linear. For
example, people with different weights or fingers with different degrees of wetness draw different total currents, and the changes in the total current and the changes in the four
partial currents It is a non-linear relationship. The four-corner custom polar coordinate system used by the capacitive touch screen does not have an origin on the coordinates.
The controller cannot detect and recover after drifting.
Moreover, after the four A/Ds are completed, the four points are The calculation process from the flow value to the X and Y coordinate values of the touch point on the rectangular
coordinate system is complicated. Since there is no origin, the drift of the capacitive screen is cumulative and calibration is often required at the job site. The outermost silica
protective glass of the capacitive touch screen is very scratch-resistant, but it is afraid of being hit by nails or hard objects
. Knocking out a small hole will damage the interlayer ITO, whether it is damage to the interlayer ITO or damage during
installation and transportation. With the ITO layer on the inner surface, the capacitive screen cannot work properly.
Contact: Mr. Lai
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1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
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Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
