Research Article
A Methodology for an FPGA Implementation of a Programmable Logic Controller to Control an Atomic Layer Deposition System
Table 1
Dictionary of ladder logic functions with their Verilog equivalents.
| LD function | LD XML | Verilog text |
| and | and | && | or | or | | NO contact | xic(a) | a | NC contact | xio(a) | !a | Comparator ≥ | GEQ(a, b) | (a≥b) | Comparator == | EQu(a, b) | (a==b) | One shots relay | ONS(a) | (a&&!prev_a) | FB timer | TON() | Timer() | FB counter | CTU() | Counter() |
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