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Home > Electrical & Electronics > Electrical Control System > Allen-Bradley 1771-DB BASIC Module

Allen-Bradley 1771-DB BASIC Module

Guizhou Yuanmiao Automation Equipment Co., Ltd.

1Yr

Allen-Bradley 1771-DB BASIC Module thumbnail-1

Allen-Bradley 1771-DB BASIC Module thumbnail-2

Allen-Bradley 1771-DB BASIC Module photo-1

Allen-Bradley 1771-DB BASIC Module photo-2

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Material:

Other, Global universal model

Condition:

Other, Global universal model

Task:

Other, Global universal model

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Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
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Material Other, Global universal model

Condition Other, Global universal model

Task Other, Global universal model

Mathematical Model Other, Global universal model

Signal Other, Global universal model

Customized Non-Customized

Structure Other, Global universal model

Operating temperature 0℃ to 60℃

Humidity 5% - 95% (non - condensing)

Operating Voltage 24V DC

I. Product Overview

The Allen-Bradley 1771-DB module is a digital input/output module in the PLC-5 series, mainly used for the acquisition and control of digital signals in industrial automation systems. With the continuous development of industrial production, the demand for precise control and status monitoring of equipment is increasing. The 1771-DB module, with its stable and reliable performance, has become an important link connecting on-site digital equipment and PLC controllers, providing a solid guarantee for the efficient operation of industrial automation systems.

The module adopts a compact design, with dimensions adapted to the 1771 series I/O enclosures, enabling easy installation in industrial control cabinets and saving installation space. The shell is made of high-quality industrial-grade materials, with excellent anti-vibration and anti-impact performance, and can work stably in environments with continuous vibrations such as machinery manufacturing workshops and assembly line production sites. At the same time, it also has good dust-proof and moisture-proof capabilities, and can adapt to the dusty and humid complex environments of industrial sites, ensuring that the module can operate normally under various harsh conditions and guaranteeing the accurate transmission of digital signals and the effective execution of control commands.

II. Performance Parameters

(1) Electrical Characteristics
Power requirements: The 1771-DB module obtains power from the backplane of the 1771 I/O enclosure during operation, usually requiring two types of power supplies: +5V DC and +24V DC. Among them, +5V DC mainly supplies power to the internal logic circuits of the module, with a typical current consumption within a specific range; +24V DC is used for driving the input/output of external digital signals, and the current consumption varies according to the number and type of external devices. This dual-power design not only ensures the stable operation of the internal circuits of the module but also provides a reliable driving power for external devices, simplifying the power supply configuration of the system.

Input characteristics: The number of digital input points is usually 16, and the input signal type is DC voltage signal, generally supporting an input range of 10-30V DC. The input current is usually a few milliamperes in the on state, and the leakage current is extremely small in the off state. The input response time is fast, generally within a few milliseconds, which can quickly capture the state changes of external devices, such as the switch signals of sensors and the trigger signals of buttons, ensuring that the PLC controller can obtain on-site information in a timely manner.

Output characteristics: The number of digital output points is also 16, and the output type is relay output or transistor output. Relay output has strong load capacity and can drive AC or DC loads, such as contactors and solenoid valves. The load voltage range is wide, usually AC 120V/240V or DC 30V and below, and the maximum load current per point can reach several amperes; transistor output has a faster response speed, suitable for occasions with high requirements on response time. The load voltage is generally DC 24V, and the maximum load current per point is relatively small, usually between 0.5-2A.

(2) Interface Characteristics
External connection interface: The module is equipped with a standard terminal block or connector for connecting the signal lines of external digital devices. The terminal block adopts a screw fixing method to ensure firm and reliable wiring, avoiding loose wiring due to vibration and other factors that affect signal transmission. At the same time, the interface has clear identification, which is convenient for technicians to perform wiring operations quickly and accurately, improving installation efficiency.

Backplane interface: It communicates with the PLC processor through the backplane connector of the 1771 I/O enclosure to realize data interaction between the module and the controller. The backplane interface adopts a reliable plug-in design to ensure stable electrical connection between the module and the enclosure, ensuring that the input digital signals can be transmitted to the PLC in a timely manner, and at the same time, the control commands issued by the PLC can be accurately transmitted to the output end of the module.

(3) Environmental Adaptability
Operating temperature: It can operate stably within a temperature range of 0°C to 60°C (32°F to 140°F), and can adapt to common temperature fluctuations in industrial production workshops. Whether it is a high-temperature metallurgical workshop or a low-temperature storage area, it can ensure the normal operation of the module without affecting the accuracy and response speed of input/output signals.

Storage temperature: In the storage state, it can withstand extreme temperatures from -40°C to 85°C (-40°F to 185°F), ensuring that the internal components of the module will not be damaged even in harsh temperature conditions during transportation, storage and other links, thus guaranteeing the performance stability of the module.

Anti-electromagnetic interference: It meets industrial-grade electromagnetic compatibility standards and has strong anti-electromagnetic interference capabilities. It can resist electromagnetic interference generated by equipment such as motors, frequency converters, and electric welders in industrial sites, preventing input/output signals from being interfered with and causing misoperation, and ensuring the reliable operation of the module.

III. Functional Characteristics

(1) Digital Signal Acquisition and Control
The core function of the 1771-DB module is to realize the acquisition and control of digital signals. It can accurately collect on-site digital input signals (such as switch signals from limit switches, photoelectric sensors, buttons, etc.) and transmit them to the PLC controller, enabling the controller to grasp the operating status of on-site equipment in real time. At the same time, it can receive control commands from the PLC controller and drive external actuators (such as solenoid valves, contactors, indicator lights, etc.) through the output end to achieve precise control of the production process. For example, in an automated production line, the module can collect the signal of the conveyor belt's position sensor. When the workpiece reaches the specified position, the PLC outputs a control command through the module according to this signal to stop the conveyor belt, realizing the precise positioning of the workpiece.

(2) Diagnosis and Status Indication
The module is equipped with rich status indicators, including power indicator lights, input point status indicators, and output point status indicators. The power indicator light being on indicates that the module is powered normally; each input point and output point has a corresponding independent status indicator light. When the input point receives a valid signal or the output point sends a control signal, the corresponding indicator light will be on, intuitively reflecting the working status of each point. This provides great convenience for technicians in debugging and troubleshooting. By observing the status of the indicator lights, they can quickly judge whether the module is working normally, whether the external equipment is connected correctly, and whether the signal transmission is smooth. In addition, the module can also send diagnostic information such as power failure and output overload to the PLC controller through the backplane interface, further improving the maintainability of the system.

(3) Overcurrent and Short-Circuit Protection
For the output end, the 1771-DB module is usually equipped with overcurrent and short-circuit protection functions. When the output load is too large or a short circuit occurs, the module will automatically cut off the power supply of the corresponding output channel to prevent damage to the internal components of the module and avoid the spread of faults affecting other circuits. After the fault is Exclusion，the module can automatically or manually restore the output function, ensuring the safety and reliability of the system. This protection function is particularly important in industrial sites, as it can effectively deal with abnormal situations caused by external equipment faults (such as short circuits of solenoid valve coils, contactor adhesion, etc.), reducing the risk of equipment damage and maintenance costs.

(4) Compatibility and Scalability
The 1771-DB module has good compatibility with Allen-Bradley PLC-5 series controllers and can be directly connected to the PLC system without complex configuration and debugging. At the same time, it supports mixed installation with other types of modules (such as analog modules, special function modules, etc.) in the 1771 I/O enclosure, facilitating users to build complex industrial automation control systems according to actual needs. When the production scale expands or the control requirements increase, users can expand the number of digital input/output points by increasing the number of 1771-DB modules, improving the flexibility and scalability of the system.

Product Tags: 1771-DB