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English 
Function in HMI System
This touch - glass is an integral part of the NT20 series HMIs. It serves as the interface through which operators can input commands and receive visual information. When combined with other elements like protective films and display screens, it forms a comprehensive repair kit. This is highly useful for maintaining the functionality of the NT20 series programmable terminals in factory automation (FA) environments. The NT20 series programmable terminals play a vital role in industrial settings, acting as a bridge between operators and automated machinery. They are used to display real - time data such as machine status, process variables, and alarm messages. Operators can also use the touch - glass to input commands, set parameters, and navigate through various control interfaces.
Compatibility
It is specifically engineered to be compatible with the NT20 series of HMIs. This ensures seamless integration with other components within the series, such as the control circuitry and software systems. The compatibility extends to both hardware - level connections, where it fits precisely into the designated slot or mounting area of the HMI unit, and software - level interactions. The touch - glass is recognized by the HMI's operating system, and the input signals it generates are accurately processed and translated into appropriate actions.
Display - related Parameters
Display Technology: The NT20 - ST121B utilizes STN (Super - Twisted Nematic) LCD technology. STN LCDs are known for their relatively low power consumption, which is beneficial for applications where energy efficiency is a concern, such as in industrial settings where multiple devices are operating simultaneously. They also offer good visibility in a variety of lighting conditions, making them suitable for use in different factory environments.
Screen Size: With a diagonal measurement of 4.6 inches, the touch - glass provides a compact yet sufficient display area. This size is carefully chosen to balance the need for a large enough surface to present information clearly and the requirement for a space - saving design. It allows for the display of important data and graphical elements without taking up excessive space on the control panel.
Resolution: Boasting a resolution of 256×128 pixels, the touch - glass can present a reasonable level of detail. This resolution is adequate for displaying text - based information, simple graphics, and basic icons. For example, it can clearly show numerical values of process parameters, status indicators in the form of small symbols, and short text messages related to machine operations or alarms.
Color Capability: It supports 8 colors, which may seem limited compared to modern high - end displays but is sufficient for industrial applications. These colors can be used to distinguish different types of information. For instance, green might be used to indicate normal operating status, red for alarms, and yellow for warnings. The limited color palette also helps in reducing the complexity of the display system and ensures that the information is easily distinguishable even at a glance.
Display Mode: The blue - mode display offers a distinct visual appearance. The blue - colored elements on a contrasting background provide good readability, especially in environments with ambient light. This mode is optimized for easy identification of information, making it convenient for operators to quickly understand the status of the connected machinery.
Long - term Performance Parameter
Service Life: The NT20 - ST121B is designed to have a service life of at least 50,000 hours. This long - lasting performance is crucial in industrial applications where downtime should be minimized. With such a long service life, the touch - glass can operate continuously for an extended period without significant degradation in performance. It can withstand the rigors of continuous use in factory environments, including temperature fluctuations, vibrations, and frequent touch interactions.
Function in HMI System
This touch - glass is an integral part of the NT20 series HMIs. It serves as the interface through which operators can input commands and receive visual information. When combined with other elements like protective films and display screens, it forms a comprehensive repair kit. This is highly useful for maintaining the functionality of the NT20 series programmable terminals in factory automation (FA) environments. The NT20 series programmable terminals play a vital role in industrial settings, acting as a bridge between operators and automated machinery. They are used to display real - time data such as machine status, process variables, and alarm messages. Operators can also use the touch - glass to input commands, set parameters, and navigate through various control interfaces.
Compatibility
It is specifically engineered to be compatible with the NT20 series of HMIs. This ensures seamless integration with other components within the series, such as the control circuitry and software systems. The compatibility extends to both hardware - level connections, where it fits precisely into the designated slot or mounting area of the HMI unit, and software - level interactions. The touch - glass is recognized by the HMI's operating system, and the input signals it generates are accurately processed and translated into appropriate actions.
Display - related Parameters
Display Technology: The NT20 - ST121B utilizes STN (Super - Twisted Nematic) LCD technology. STN LCDs are known for their relatively low power consumption, which is beneficial for applications where energy efficiency is a concern, such as in industrial settings where multiple devices are operating simultaneously. They also offer good visibility in a variety of lighting conditions, making them suitable for use in different factory environments.
Screen Size: With a diagonal measurement of 4.6 inches, the touch - glass provides a compact yet sufficient display area. This size is carefully chosen to balance the need for a large enough surface to present information clearly and the requirement for a space - saving design. It allows for the display of important data and graphical elements without taking up excessive space on the control panel.
Resolution: Boasting a resolution of 256×128 pixels, the touch - glass can present a reasonable level of detail. This resolution is adequate for displaying text - based information, simple graphics, and basic icons. For example, it can clearly show numerical values of process parameters, status indicators in the form of small symbols, and short text messages related to machine operations or alarms.
Color Capability: It supports 8 colors, which may seem limited compared to modern high - end displays but is sufficient for industrial applications. These colors can be used to distinguish different types of information. For instance, green might be used to indicate normal operating status, red for alarms, and yellow for warnings. The limited color palette also helps in reducing the complexity of the display system and ensures that the information is easily distinguishable even at a glance.
Display Mode: The blue - mode display offers a distinct visual appearance. The blue - colored elements on a contrasting background provide good readability, especially in environments with ambient light. This mode is optimized for easy identification of information, making it convenient for operators to quickly understand the status of the connected machinery.
Long - term Performance Parameter
Service Life: The NT20 - ST121B is designed to have a service life of at least 50,000 hours. This long - lasting performance is crucial in industrial applications where downtime should be minimized. With such a long service life, the touch - glass can operate continuously for an extended period without significant degradation in performance. It can withstand the rigors of continuous use in factory environments, including temperature fluctuations, vibrations, and frequent touch interactions.
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