CIRCUIT · RELAY INTERFACE PNP NPN
Relay Interface PNP NPN Circuit Diagrams
Relay interfaces convert PNP sensor signals to NPN outputs (or vice versa) to match PLC input modules and field devices. These circuit diagrams show the wiring, coil, and contact arrangements for common PNP/NPN relay interface applications.
Make your own relay interface pnp npn diagram.
Describe it in plain English — the AI drafts it, you edit. No template wrangling.
ABOUT
About these examples.
Browse examples below for packaging machines, water treatment, motor start-stop, and more. Each diagram is editable — click any example to open it in the editor, modify values, and download or share. Use the generator to start from a blank canvas or adapt an existing diagram.
HOW TO
Make one yourself.
Choose a relay symbol
Select a relay coil and contact symbol from the circuit library.
Add PNP/NPN sensor inputs
Place PNP sensor blocks for sourcing inputs or NPN for sinking, depending on your PLC input module.
Wire coil and contacts
Connect the sensor output to the relay coil, and wire the contact to the PLC input or load.
Configure ratings
Set coil voltage, contact current, and terminal labels to match your hardware.
Export and share
Download as PNG, SVG, or PDF, or generate a share link for your team.
FAQ
Frequently asked questions
What is the difference between PNP and NPN sensors in a relay interface?
PNP sensors source current to the load (positive switching), while NPN sensors sink current (negative switching). A relay interface can adapt one type to the other to match PLC input specifications.
How do I wire a PNP sensor to a relay input?
Connect the PNP sensor output to the relay coil positive terminal, and connect the other coil terminal to ground. The relay contacts then switch the PLC input as needed.
Can I use a relay interface to convert PNP to NPN output?
Yes, a relay with a PNP-driven coil and NPN-wired contacts can convert a sourcing sensor signal to a sinking output, or vice versa, depending on the contact wiring.
What relay coil voltage should I use for a PLC input?
The coil voltage depends on the sensor supply and relay specifications. Common values are 24 V DC for industrial PLC systems, but always match the coil to your control voltage.
Can I edit these diagrams to match my exact hardware?
Absolutely. Every diagram opens in the editor where you can change symbols, wire connections, labels, and ratings to fit your specific relay interface model.
MORE CIRCUIT COLLECTIONS
4-Digit 7-Segment Display Circuit Diagrams
Adjustable DC Power Supply Circuit Examples
Aircraft Wiring Diagram Examples & Templates
Alarm System Circuit Diagrams
Amplifier Circuit Diagrams
Apple EIS Circuit Diagrams: Examples & Generator
Arduino Circuit Diagrams
Astable Multivibrator Circuit Diagrams
AT89S52 Relay Board Circuit Diagrams & Design Examples
Audio Clipper Circuit Diagrams
5-Band Audio Equalizer Circuit Diagrams
Automotive Circuit Diagram Examples & Maker
Battery Charger Circuit Diagrams
Battery Overcharge Protection Circuit Diagrams
Battery Series-Parallel Circuit Wiring Diagrams
Beauty Salon Cleaner Circuit Diagram Examples
BFO Metal Detector Circuit Diagrams
Blind Contact Detector Circuit Diagrams & Examples
Second-Order Butterworth Low-Pass Filter Circuit Diagram Examples
CMOS Logic Gate Circuit Diagrams
Contactor Interlock Control Circuit Diagrams
DC-DC Converter Circuit Diagram Examples
DC Shunt Generator Circuit Diagrams
PT2258 Digital Volume Control Circuit Diagrams
Dual Door Linkage Circuit Diagram Examples
Electric Wheelchair Controller Circuit Diagrams
Electronics Design Circuit Diagram Examples
ESP32 Battery Management Circuit Examples & Generator
ESP32 Embedded System Circuit Diagrams
ESP32 IoT Weather Station PCB Circuit Diagrams
ESP32 Load Monitoring Circuit Examples & Generator
ESP8266 Home Automation Relay Circuit Diagrams
Galvanic PWM Isolation Circuit Diagrams: Examples & Generator
GNSS Module Circuit Diagrams
Guitar Wiring Diagram Examples
Hand Crank Dynamo Circuit Diagrams
Highway Speed Checker Circuit Diagrams
Hobbs Enable Circuit Diagrams
Hydraulic Circuit Diagrams for Heavy Machinery and Industrial Systems
Inverter Circuit Diagrams
K-Line Transceiver Circuit Diagrams
Latching Power Switch Circuit Examples
LED Constant Current Protection Circuit Examples
Lighting Circuit Diagrams
Low-Noise Binaural Microphone Preamp Circuits
Monostable Multivibrator Circuit Diagram Examples
Motor Control Circuit Diagrams
Computer Mouse Circuit Diagrams
Multiplexed LED Matrix Circuit Diagrams
Non-Contact AC Voltage Detector Circuit Diagrams
NTC Heating Thermostat Circuit Examples
Parallel Resistor Circuit Diagram Examples & Maker
Photodetector Circuit Diagrams
Piezo Preamp Circuit Diagrams — Examples & Generator
Piezoelectric Energy Harvesting Circuit Diagrams & Examples
PLC Industrial Control Circuit Diagrams
Power Supply Circuit Diagrams
Pressure-Sensitive LED Mat Circuit Diagrams & Examples
0–300 Hz Pulse Generator Circuits for Electromagnets
Pump Control Circuit Diagrams & Examples
Railgun Circuit Diagrams: Examples and Free Generator
Raspberry Pi GPIO LED Driver Circuit Diagrams
RC Car Circuit Diagrams
Rechargeable Table Fan Circuit Diagrams & Examples
Latching Relay Circuit Diagrams
Residential Wiring Diagram Examples
Satellite Dish Signal Detector Circuit Diagrams
Series LCR Circuit Diagram Examples
Smart Agriculture Circuit Diagrams
Solar Panel Circuit Diagrams
Solar Tracking System Circuit Diagram Examples
Solar Wind Battery Lighting with Zapper Circuit Diagrams
Spirit Pi Metal Detector Circuit Diagrams
Circuit Diagrams for Stereo Audio Splitters with Transformer Isolation
STM32 RS-232 to Ethernet Circuit Diagrams
Styrofoam Cutter Power Supply Circuit Diagrams
TEC Temperature Control Circuit Diagrams
Three-Phase DOL Motor Starter Circuit Diagram Examples
Three-Phase Star-Delta Connection Circuit Diagrams
Timer Switch Circuits: Examples & Design Templates
TTP223 Touch Switch Circuit Diagrams
Vacuum Tube Amplifier Circuit Diagrams
Water Level Controller Circuit Diagram Examples & Templates
Wind Turbine DC Charging Circuit Diagrams
Full-Bridge WPT Sender Circuit Diagrams
Start from a blank canvas →
Open the AI editor and describe what you need — export PNG/SVG when you're done.