Allen Bradley 1771-DB/-1771DB/A Basic Module Allen Bradley 1771-DL/1771DL Gray Encoder Allen Bradley 1771-DMC4/1771DMC4 Co Processor Allen Bradley 1771-DR/A Rev A/1771DR Logic Controller Allen Bradley 1771-E1C/1771E1C Analog Input Expander Allen Bradley 1771-E4C /1771E4C Analog Input Expander Allen Bradley 1771-ESC/1771ESC Servo Expander Allen Bradley 1771-HM3A/1771HM3A 64K Memory Allen Bradley 1771-HRA/1771HRA Excitation resolver Allen Bradley 1771-HS/1771HS with 1771-HM 32K Memory Allen Bradley 1771-HS1/1771HS1 Axis Servo Allen Bradley 1771-HS3A/1771HS3A 3 Axis Servo Allen Bradley 1771-HSN/1771HSN Allen Bradley 1771-IA/1771IA Input Allen Bradley 1771-IAD Input Ser A A16B-1211-0311 A16B-1211-0311 A16B