1.a  The G4PB16J and G4PB16K DC input racks provide 16 channels of optically-isolated inputs for sensing on/off DC voltage levels by a B1, B5, or B100 brain board, or any ISA bus-compatible computer with an Opto 22 G4AC5 adapter card.

1.b  The G4PB16L DC output rack provides 16 channels of opticallyisolated outputs for controlling or switching small DC loads by a B1, B5, or B100 brain board, or any ISA bus-compatible computer with an Opto 22 G4AC5 adapter card. Their compact size and design yields a substantial space and cost savings over other 16-channel I/O boards.

1.c  SNAP PAC I/O mounting racks are designed to hold an intelligent SNAP I/O processor—a SNAP PAC EB-series or SB-series brain or a SNAP PAC R-series on-the-rack controller—and several I/O modules. Both standard wired controllers and brains and Wired+Wireless models are mounted on these racks.