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Allen-Bradley 1764-28BXB

The Allen-Bradley 1764-28BXB is a versatile and robust base unit designed for use in industrial automation systems. This unit, part of the MicroLogix 1500 series, offers a range of features and capabilities that make it suitable for various applications requiring reliable and efficient control solutions.

Technical Description:

The Allen-Bradley 1764-28BXB base unit operates with a relay output channel voltage ranging from 24 -125 VDC and 120 ‚ 240 VAC, ensuring compatibility with various power supply configurations. The unit features a 24 Volt DC sink/source input circuit type.

The output circuit type comprises six relay and six FET transistor outputs, providing multiple options for controlling external devices. This base unit supports a transistor output channel voltage of 20.4 VDC to 26.4 VDC, offering stable and consistent output for connected equipment.

The line power requirement is specified as 20.4-30.0 Volts DC, ensuring reliable operation in diverse environments. The high-speed output frequency capability of 20 kHz makes it suitable for applications demanding rapid response times.

With a power supply voltage range of 20.4 to 30 VDC and a power supply usage of 30 Watts, the 1764-28BXB is both efficient and powerful. It can handle a power supply inrush current of 24 VDC at 4 A for 150 ms, accommodating sudden spikes in power demand.

The units dimensions are 5.43 x 6.62 x 3.43 inches, making it compact enough for installations where space is limited. The maximum load current of 400 mA ensures the unit can manage moderate loads without issues.

Input and Output Capabilities:

The 1764-28BXB base unit features an I/O count of 16 inputs and 12 outputs, with a maximum expanded I/O count of 512, making it highly scalable. The input channel voltage is 24V DC, supporting both sink and source configurations.

The input voltage is also 24 Volts DC, ensuring compatibility with standard industrial control signals. High-speed input frequency capabilities include eight 20 kHz inputs, making the unit suitable for applications requiring fast response times.

The output source includes a relay port and DC FET, providing flexibility in controlling different types of loads. The number of outputs is six relay outputs, four standard 24 VDC transistor outputs, and two fast 24 VDC outputs.

Communication and Expansion:

The base unit supports the installation of additional modules such as Real-Time Clock and Memory modules, enhancing its functionality. It is also compatible with Compact I/O modules for further expansion of its integrated features.

The integrated serial communication port has a default configuration of 19.2K Baud Rate, no parity, node address set to 1, and no handshaking. It includes CRC error detection, auto-detect embedded responses, and duplicate packet (message) detection enabled.

The communication port settings, such as ACK timeout of 50 counts and NAK retries set to 3, ensure reliable data transmission. The ENQ set to 3 retries and stop bits set to 1 further enhances communication reliability.

Frequently Asked Questions:

What are the input and output capabilities of the Allen-Bradley 1764-28BXB?

The 1764-28BXB has 16 inputs and 12 outputs. It supports an input channel voltage of 24V DC. The maximum expanded I/O count is 512.

What is the power supply requirement for the 1764-28BXB?

The unit requires a power supply voltage of 20.4 to 30VDC. It uses 30 Watts of power. The power supply inrush current is 24V DC at 4A for 150 ms.

What connectivity options does the 1764-28BXB base unit offer?

It features an integrated serial communication port with a 19.2K Baud Rate. The port supports no parity and the node address is set to 1. It includes CRC error detection and auto-detect embedded responses.

Product Specifications Table