1746-OB8 ALLEN-BRADLEY NEW USED SLC500 SLC 500 1746-OB8 MODUL 1746-OB8 PLC 1746-OB8 ALLEN BRADLEY Allen-Bradley 1746-OB8 SLC 500 OB8 module Allen-Bradley SLC 500 Digital DC output module 8-channel 24V DC output module SLC 500 PLC output module 8 channels SLC 500 expansion module OB8 PLC I/O module 1746‐OB8 Allen-Bradley automation component