TIDA-010044

NAMUR PLC Digital input with fault protection and diagnostics reference design

TIDA-010044

Design files

Overview

The NAMUR proximity sensor is widely used in industrial control when a special requirement on maximum energy is to be fulfilled by the sensor. This in turn dictates special requirements on the PLC digital input designed to interface with such sensor with regard to accuracy, and reliability. This reference design is a full front-end of a digital input compatible with NAMUR sensors. The design demonstrates achieving reliability through redundancy, fault protection, and extensive diagnostic features in a compact footprint.

Features
  • 1.6-mA threshold, 0.4-mA hysteresis
  • 0.2-mA open circuit, 6-mA short-circuit threshold
  • 8.2-V open-circuit voltage, 8.2-mA short-circuit current
  • Extensive diagnostics
  • Fault protection
  • Power and data isolation
  • Redundant components for higher reliability
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEL4.PDF (1014 K)

Reference design overview and verified performance test data

TIDRXY7.PDF (252 K)

Detailed schematic diagram for design layout and components

TIDRXY8.PDF (61 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRXY9.PDF (140 K)

Detailed overview of design layout for component placement

TIDRXZ1.ZIP (861 K)

Files used for 3D models or 2D drawings of IC components

TIDCF28.ZIP (388 K)

Design file that contains information on physical board layer of design PCB

TIDRXZ0.PDF (606 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

AC/DC & DC/DC converters (integrated FET)

LM250197.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator

Data sheet: PDF | HTML
Comparators

LM2901AV-Q1Automotive precision quad differential comparator

Data sheet: PDF | HTML
Digital isolators

ISO7340FCLow-power, quad-channel, 4/0, 25-Mbps, default output low digital isolator

Data sheet: PDF | HTML
Inverting buffers & drivers

SN74LVC1G14Single 1.65-V to 5.5-V inverter with Schmitt-Trigger inputs

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV760100-mA, 30-V, low-dropout voltage regulator

Data sheet: PDF | HTML
Shunt voltage references

TL431LIAdjustable precision shunt regulator with optimized reference current (pin layout: KRA)

Data sheet: PDF | HTML
TVS diodes

TVS330133 V Bidirectional Flat-Clamp surge protection device

Data sheet: PDF | HTML

Start development

Design tools & simulation

Simulation model

TIDA-010044 Simulation Files — TIDM053.ZIP (75 K)

Technical documentation

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Type Title Date
* Design guide NAMUR PLC Digital Input With Fault Protection and Diagnostics Reference Design Dec. 10, 2018

Related design resources

Design tools & simulation

SIMULATION TOOL
TINA-TI SPICE-based analog simulation program

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