Allen-Bradley SLC 500 Processor Unit 1747-L542 Ser. B Proc. Rev.: 3 Used_x000D_ Condition: UsedModel: Allen-BradleyMPN: 1747-L542Brand: Allen-BradleyController Platform: SLC 500 Allen-Bradley SLC 500 Processor Unit 1747-L542 Ser. B Proc. Rev.: 3 Used Allen-Bradley SLC 500 Processor Unit Part #: 1747-L542 Ser. B Rev.: 3 OS #: 1747-OS401Ser. BFRN: 7UsedLoc: 19B4-28 Allen-Bradley SLC 500 Processor Unit Part #: 1747-L542 Ser. B Rev.: 3 OS #: 1747-OS401 Ser. B FRN: 7 Uséd Loc: 19B4-28