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The Allen-Bradley 1771-A4B is a 16-slot universal I/O chassis designed for use with the PLC-5 family of programmable controllers. Catalog number 1771-A4B, Series A, part number 966494-01. The chassis provides a 5 volt backplane rated at 24.0 A max at 5.25 VDC max, with a memory line rated at 0.50 A max at 5.25 VDC max. Rated for Class 1, Division 2, Groups A, B, C, D, Temperature Code T6 hazardous environments per nameplate. UL Listed and CSA certified. The unit accommodates Allen-Bradley 1771-series I/O modules across 16 module slots, supporting a wide range of digital and analog I/O configurations within PLC-5 control systems. The left-most slot is reserved for an I/O adapter module or processor. Manufactured in Canada. Date code 9023, Code 3: 43. Internal PCB part number 960152-02FT30, date code CDN9022. Original product documentation (Publication 1771-2.49C, November 1988) is included with the unit. Chassis is intact with all module retaining clips present. Compatible replacement chassis for legacy Allen-Bradley PLC-5 systems requiring 16-slot capacity. Discontinued by manufacturer; sourced from industrial surplus.
