The Numa-Logic 300 series was a set of signal level conversion and logic modules that were mounted in a card cage (rack). The signals were brought into the cards through card edge connectors on the back of the card and interconnected using wire wrapping and the wire wrapping tool.
This is what the back of those racks looks like, and this is the tool you use to wrap (or unwrap) the connections.
In NL-3xx systems you typically have input modules that convert field level voltages into low-level signals. These low-level signals are connected to various logic and memory modules. The wire-wrapped interconnections establish the logic and stores the program. Other than the PROM (NL-368) module, no module includes retentive memory and so no programs are stored on the modules themselves. It is the interconnection of the logic gates with one another that "stores" the program.
The input and output pin numbers for each channel correspond to the number on that slide out plastic sleeve on the front of the module.
The input signal is connected to the pin on the left (XX). The converted signal is available at the pin shown on the right (YY).
You also have the option of connected to the inverted version of the signal (ZZ in the diagram below).
Refer to the following table for Section 6 page numbers that correspond for the various NL-3xx modules.
Suffixes such as "H" or "HS" correspond to higher speed versions (with correspondingly less noise immunity) of
the same module.
Refer to documentation for that particular module to learn more:
Return to Numa-Logic page.
Copyright Eaton Corporation 2011