In the first step of the analysis, all pertinent design information is converted into a form suitable for computer input. This process requires initially the simplification of design schematics. For the circuitry in this example, schematic simplification is accomplished by identifying all possible current flow continuities and listing them in a "from-to" manner, as shown in Table A-1. Note that all schematic components are represented by "analogs" functional representations composed of combinations of switches, resistors, and diodes. For example, the analog for a relay contact (K2) is a switch (SK2). Also, the analog for a transistor (Q1) is a diode (CRQ1) and a switch (SQ1) in series.
As an example of the "from-to" information provided by Table A-1, the first line of data indicates that pin 11 on relay K2 is connected to pin 8 on connector board NP1.