Second Generation I/O Cards

ANDON documentation

ANDON documentation from a project done in 1996

The second generation cards were designed for a system integrator while working at Rockwell Automation in 1996. The system integrator installed the 4000 I/O system in a motor plant that had previously standardised on Telemechanique. The specification was constrained by the PLC interface, which is what will happen in most cases where customers would like to save on panel wiring but an “off-the-shelf” solution does not exist. If you are in a similar position, we might be able to help, but have a look at the documentation first.

The old documentation from 1996 was gathered and put through LaTeX in 2011, with a download:
Digital Interfaces—Our Second Generation 1337 kBytes gen2.pdf

ANDON input card

The input card was designed to keep high voltages out of a rack. (24Vdc is high when the processor croaks if fed more than 5V, new I/O levels are 3,3V and 1,8V). Although designed for the Allen-Bradley SLC500 1746-IB32 input card, we included opto-isolation for use in other controllers based on VME or CPCI. Connectors allowed quick swap out of the 32-signal board, however, during the ten or so year installation, no boards failed.

The customer requested no surface mount components and also socketed the opto-isolators. Future boards will require microscopes just to find the parts...


ANDON output card

The output card was designed for the Allen-Bradley SLC500 1746-OV32 output card. The interface was to simplify panel wiring for a custom designed ANDON board.