The Allen-Bradley 1764-28BXB is a MicroLogix 1500 base controller. This 24V DC base unit features 16 inputs, 12 outputs with a mix of relay and DC FET output types, supporting up to 512 expanded I/O. With a high-speed input frequency of 20 kHz and dimensions of 5.43 x 6.62 x 3.43 inches, it's designed for flexible mounting and compatibility with 1764-LSP and 1764-LRP processors. Despite being discontinued, it remains a robust option for industrial control. Brand Allen-Bradley Part Number/Catalog No. 1764-28BXB Series MicroLogix 1500 Function Base Controller I/O Count 16 inputs/12 outputs Module Type Base Unit Max Expanded I/O Count 512 No. of Inputs 16 inputs Input Voltage 24 Volts DC Input channel Voltage 24V dc, sink/source Output Source Relay Port and DC FET High Speed Input Frequency Eight (8) 20 kHz input No. of Outputs Six (6) Relay; Four (4) Standard 24VDC Transistor; Two (2) Fast 24VDC Input Circuit Type 24 Volt DC Sink/Source Relay Output channel Voltage 24-125VDC; 120-240VAC Output Circuit Type 6 Relay, 6 FET Transistor Transistor Output channel Voltage 20.4VDC - 26.4VDC Line Power 20.4-30.0 Volts DC High Speed Output Frequency 20 kHz output Power Supply Usage 30 Watts Power Supply Voltage 20.4 to 30VDC Power Supply Inrush Current 24V dc = 4A for 150 ms Maximum Load Current 400 mA Dimensions 5.43 x 6.62 x 3.43 inches Mounting Horizontal Compatible Processors 1764-LSP and 1764-LRP Product Lifecycle Status* Discontinued/Obsolete