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The Allen-Bradley 1774-SR is a remote I/O half scanner module designed for the SLC 500 controller system, functioning within Series B/Bulletin 1774. This module facilitates communication between a processor and I/O chassis in remote locations, supporting up to 512 I/O points across four full logical racks. Featuring a block transfer capacity of 64K words of data and a maximum current rating of 0.9 Amps at 5 Volts DC, the 1774-SR seamlessly integrates with various digital, analog, and intelligent I/O modules. Designed to meet CE, EMC, and low voltage directives, it exemplifies compliance with standards such as EN 50081-2 and EN 61131-2, ensuring robust and reliable performance in industrial environments.