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2711-T5A8L1 is a Human Machine Interface (HMI) device that is part of the PanelView 550 standard operator terminal produced by Allen Bradley. It is electronic hardware designed to be installed near controlled machines or processes, providing real-time operator monitoring and control interfaces. This terminal has built-in functions, including a visualization screen, operator input interface, communication, as well as integrated memory modules and other basic components. Specifically, the integrated screen is a 5.5-inch monochrome display with a screen resolution of 256 x 128 pixels. The touch sensing units are distributed along the screen in 24 columns x 18 rows, with each touch unit measuring 16x16 pixels. There are a total of 128 touch units. These units enable HMI interaction to directly touch runtime objects linked to operator actions and specific triggers. The built-in communication port includes one (1) Data Highway Plus (DH+) port, which is compatible with long-distance multi node communication applications using 3-wire cables (especially Belden 9463 cables or Allen Bradley's 1771-CD cables). The second port is the RS232 interface, mainly used for communication with alarm printers for archiving and saving records. It is equipped with built-in graphics libraries, alarms, trends, and recipe objects, and also supports HMI security configuration.
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