Implementation and organization of a programmable controller, uses an input register to accept data and transfers to a stack for processing, and an output register to deliver data to outputs

摘要

The controller loads data (E0 ... En) from n input modules, and stores the data in a memory (DS) with a single bit for each input. The input data is organized in a stack (BITST) and a processor register (EX) loaded from the stack. Output data is stored in a processor register (DX) with a single bit for each output. Output data is transferred to a register (DS) and sent to outputs (A0 ... An).