OMRON

Omron E3JK-DN11 Photoelectric Sensor Comprehensive Explanation

I. Product Model and Series Classification
Full Model: E3JK-DN11
Product Series: OMRON E3JK General Square Photoelectric Switch Series, belonging to Diffuse-reflective photoelectric sensor
Model Breakdown Interpretation
E3JK: OMRON Economic Square Photoelectric Switch General Series;
D: Diffuse-reflective, diffuse reflection detection type (light emitted hits the object and is reflected back to the receiving end to complete the detection);
N: NPN transistor output;
11: Standard detection distance version, with adjustable sensitivity through the top potentiometer.
II. Core Electrical and Hardware Parameters

1. Power Supply and Output
   Working Voltage: DC 10~30V, industrial standard DC power supply, can be directly connected to the PLC DC 24V input terminal;
   Output Type: NPN Collector Open-Drain Output;
   Load Current: Maximum 100mA, can directly drive PLC input, small indicator lights, intermediate relay coil;
   Connection Definition (printed on the body):
   Brown: DC 24V Positive Power Supply
   Black: NPN Signal Output Wire
   Blue: 0V Negative Ground Wire
2. Detection Performance
   Detection Method: Diffuse Reflection (no need for a reflective plate, directly detect the object)
   Standard Detection Distance: 0.1m~2m (can be continuously adjusted for detection distance by the top potentiometer)
   Detectable Objects: opaque materials, metals, plastics, paper, paper boxes, workpieces, transparent/semi-transparent materials with adjustable sensitivity for adaptation
   Response Speed: 500Hz, no loss of detection signal for high-speed assembly line materials
3. Structure and Protection
   Shell: ABS flame-retardant square housing, standard installation holes, convenient bracket fixation;
   Protection Grade: IP64, dust-proof, splash-proof cutting fluid, cooling water, suitable for ordinary oil-stained workshop environments;
   Environmental Temperature: -25℃ ~ +55℃, stable operation in hot and cold workshop environments;
   Certification: CE, general compliance for industrial equipment.
4. Key Functions
   Adjustable Sensitivity Potentiometer: Top knob on the body, freely switch between close-range small workpieces and long-range large materials;
   Built-in Overload and Short Circuit Protection, output short circuit will not burn the sensor;
   Resistant to strong light interference, not easily triggered by workshop fluorescent lights, sunlight direct exposure;
   Indicator Light: Red action indicator light, often on when an object is detected, convenient for on-site debugging and troubleshooting.
   III. Core Working Principle
   The sensor internally emits infrared light. When there is an object in front, the light is reflected back to the sensor’s receiving window, and the internal circuit conducts, the black output wire outputs a low-level signal, and the PLC collects the signal to determine “material is in place / there is a workpiece”;
   When there is no object blocking, there is no reflected light, the signal is disconnected.
   IV. Main Application Industries and Scenarios
5. Assembly Line Conveyor Equipment (Most Commonly Used)
   Pneumatic line, roller line material in-place detection, presence or absence of material judgment;
   Paper box, plastic box, packaging bag counting, material shortage alarm;
   Combined with CP1L, NJ series PLC to achieve assembly line start-stop, sorting and diversion control.
6. Packaging Machinery
   Stacking packaging machine, vertical sealing machine, labeling machine, cutting machine:
   Detecting film presence, packaging material in-place, label positioning, material shortage automatic stop alarm.
7. 3C Electronic Automation Equipment
   Syringe filling machine, screw locking machine, PCB board separation machine, testing fixture:
   Detecting workpiece in the fixture, whether the workpiece is placed in place, preventing empty machine operation.
8. Injection, die-casting, stamping equipment
   Detecting whether there is a product falling from the mold, whether the material head is present, whether the workpiece is out of place, preventing secondary mold closing and pressing.
9. Logistics Sorting, Warehouse Equipment
   Package recognition, material box in-place detection, stacker material presence, triggering sorting change action.
10. Woodworking, Textile, Food Equipment
11. Inspection of wood panels, fabric breakage detection, and material presence detection at food filling stations.
12. Auxiliary inspection of machine tools
    Output inspection of machined parts by CNC, auxiliary detection of coolant tank level, confirmation of door safety in place.
13. Reference for distinguishing the same series of photoelectric models
    E3JK-DN11 (this model): Diffuse reflection NPN output, adjustable from 0 to 2m, general standard model;
    E3JK-DP11: Diffuse reflection PNP output, compatible with PNP input type PLC;
    E3JK-RN11: Mirror reflection type (requires reflective plate), maximum detection distance of 4m;
    E3JK-TR11: Reflective type (emitter + receiver separation), maximum 10m, dedicated for harsh environments with strong light and dust;
    E3JK-DS30M1: Short-distance diffuse reflection, only 0.3m, for micro-part detection in narrow workstations.
14. Matching of supporting control systems
    Directly connect to all series of PLC digital input terminals of Omron:
    Small equipment: CP1L series PLC digital input;
    High-end entire line: NJ101 controller + NX-ECC203 remote IO module for signal acquisition;
    The detection signals are used for equipment logic interlock, counting, servo start trigger, and material shortage stop alarm.
15. For more models, please contact via email: plcvarious@foxmail.com