The 8121-DI-DC is a model produced by General Electric Intelligent Platforms (formerly Emerson Automation) and belongs to the PAC System RX7i family. It is a 16-channel discrete input 24V DC module for dry contact switches, input high voltage side provides 24V DC, internal common returns, pulse counting options. It requires 24V DC bus field power and has a fully modular I/O solution for general purpose and hazardous area applications. It has multiple I/O functions and an open architecture that allows communication with a variety of different fieldbuses by selecting the right type of bus interface module (BIM) or controller.
A digital input module is an industrial automation device used to receive and process digital signals. This module can receive digital signals such as switch status and sensor signals, and convert them into binary digital signals that can be processed by computer systems. Digital input module usually has the characteristics of high reliability, high stability, easy maintenance, etc., and is widely used in various industrial automation control systems.
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Label
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Specification
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Model Number
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8121-DI-DC
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Brand
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GE (General Electric)
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Type
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Industrial Digital Input Module
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Input Voltage Range
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12–24V DC (Sink/Source Configurable)
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Operating Temperature Range
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-40°C to 70°C
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Communication Method
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Backplane (GE VersaBus) + Ethernet/IP
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Mounting
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DIN Rail (35mm)
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Weight
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0.32 kg
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Certifications
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CE, UL, CSA, IEC 61131-2
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Dimensions
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120mm × 80mm × 60mm (H×W×D)
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IP Rating
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IP20 (Front Panel); IP40 (With Optional Cover)
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Protocols Supported
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Ethernet/IP, Modbus TCP, GE SRTP
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Input Channels
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16 Isolated Digital Inputs
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Response Time
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≤1ms (Typical)
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Input Current
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5mA–10mA per Channel
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Isolation
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Channel-to-Channel: 500Vrms
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The working principle of the digital input module is to process and convert the received digital signal into a binary digital signal that can be recognized by the computer system. These signals can be switch states, sensor signals or other digital signals, after the digital input module processing and conversion, can be transmitted to the computer system for further processing and analysis.
Digital input modules usually have a variety of functions and features, such as high anti-interference ability, wide operating temperature range, programmable control, etc. At the same time, the digital input module also has a variety of interfaces and communication protocols, which can be easily connected and communicated with computer systems and other industrial automation equipment.
In short, the digital input module is an important industrial control equipment, with simple, reliable, stable and other characteristics, is widely used in a variety of industrial automation equipment.
