NAMUR PLC Digital input with fault protection and diagnostics reference design
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.
- 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
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
Detailed schematic diagram for design layout and components
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed overview of design layout for component placement
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
Includes TI products in the design and potential alternatives.
SN74LVC1G14 — Single 1.65-V to 5.5-V inverter with Schmitt-Trigger inputsData sheet: PDF | HTML
|*||Design guide||NAMUR PLC Digital Input With Fault Protection and Diagnostics Reference Design||Dec. 10, 2018|
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