Hardware-Based Single-Clock-Cycle Edge Detector for a PLC Central Processing Unit

Author:

Czerwinski RobertORCID,Chmiel MiroslawORCID

Abstract

This article discusses edge detectors implemented in programmable logic controllers. The behaviors of different vendors’ solutions are presented with pros and cons. The trigger functions defined in the IEC 61131-3 standard were analyzed for implementations. The main contribution of this paper is an idea for hardware acceleration of standard trigger functions that enables us to build single-clock-cycle edge detectors. Additionally, the structure for automatic edge detection on every input is shown. The structure with a synthesizable Verilog HDL description is presented. The comparison of the solution with vendor programmable logic controllers (PLCs) proves the effectiveness of the designed hardware-aided unit.

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Computer Networks and Communications,Hardware and Architecture,Signal Processing,Control and Systems Engineering

Reference25 articles.

1. EN 61131-3:2013, Programmable Controller—Part 3: Programming Languages,2013

2. Proposed corrections to the IEC 61131-3 standard

3. An IEC 61131-3-based PLC implemented by means of an FPGA

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3. PLC implementation in the form of a System-on-a-Chip;Bulletin of the Polish Academy of Sciences Technical Sciences;2020-10-30

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