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Omron / Sentech E3NC-LA21 / LA51 / LA7 / LA24 / LA9 / LA54 / LA0 (E3NC-L amps); E3NC-SA21 / SA51 / SA7 / SA24 / SA9 / SA54 / SA0 (E3NC-S amps) machine vision sensor
Omron / SentechLaser measurement sensors
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Omron / Sentech E3NC-L / E3NC-S Smart Laser Sensor Amplifier Units

E3NC-LA21

The E3NC-L amplifiers (E3NC-LA21/LA51/LA7/LA9/LA24/LA54/LA0) drive E3NC-LH through-beam/retro-reflective/diffuse laser heads for high-speed presence detection with response times down to 80 us, while the E3NC-S amplifiers (E3NC-SA21/SA51/SA7/SA9/SA24/SA54/SA0) drive E3NC-SH CMOS laser heads for distance-settable measurement with response times down to 1.5 ms. All heads use a Class 1 visible red semiconductor laser at 660 nm. Amplifiers are available with NPN open-collector outputs (LA21/LA7/LA24, SA21/SA7/SA24) or PNP open-collector outputs (LA51/LA9/LA54, SA51/SA9/SA54), with 2-output+1-input or 1-output+1-input configurations and pre-wired (2 m), wire-saving-connector or M8-connector connection. The LA0/SA0 networking models carry no discrete I/O and instead connect to an E3NW communications unit for EtherCAT, CC-Link or CompoNet fieldbus integration, with up to 30 amplifier units chainable per group.

Brand
Omron / Sentech
Sensor type
Laser distance / presence sensor amplifier (E3NC Smart Laser Sensor)
Sensing method
Laser triangulation (E3NC-S CMOS heads) / through-beam, retro-reflective and diffuse-reflective (E3NC-L heads)
Light source
Visible semiconductor red laser diode, 660 nm, Class 1 (JIS/IEC/EN/FDA/GB-T)
Response time
E3NC-L: 80 us / 250 us / 1 ms / 16 ms; E3NC-S: 1.5 ms / 5 ms / 10 ms / 50 ms (selectable response modes)
Output type
NPN open-collector (LA21/LA7/LA24, SA21/SA7/SA24) or PNP open-collector (LA51/LA9/LA54, SA51/SA9/SA54); 30 VDC max, 100 mA max load
Communication
Networking models E3NC-LA0 / E3NC-SA0 connect via E3NW communications unit: EtherCAT (E3NW-ECT), CC-Link (E3NW-CCL) or CompoNet (E3NW-CRT)
Supply voltage
10 to 30 VDC (including 10% ripple p-p)
Connection
Pre-wired 2 m cable (LA21/LA51/SA21/SA51), wire-saving connector (LA7/LA9/SA7/SA9) or M8 connector (LA24/LA54/SA24/SA54)
Housing material
Case and cover: Polycarbonate (PC); cable: PVC (vinyl chloride)
Weight
Approx. 75 g (pre-wired amplifier unit only); approx. 115 g packed
Operating temperature
Operating -25 to 55 °C (groups of 1-2 units; derated to -25 to 40 °C for 17-30 units); storage -30 to 70 °C
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Technical overview

The Omron E3NC-L / E3NC-S range covers the amplifier units of the E3NC Smart Laser Sensor system rather than the optical heads themselves, so what you are specifying here is the signal-processing, display and output side of a two-part laser sensor. The amplifiers split into two families with very different jobs. E3NC-L amplifiers (LA21/LA51/LA7/LA9/LA24/LA54/LA0) drive E3NC-LH presence heads in through-beam, retro-reflective and diffuse-reflective configurations, and they are built for speed: selectable response modes run down to 80 microseconds, with 250 us, 1 ms and 16 ms steps available to trade speed for stability. E3NC-S amplifiers (SA21/SA51/SA7/SA9/SA24/SA54/SA0) instead drive E3NC-SH CMOS heads using laser triangulation, giving a distance-settable measurement output with response times of 1.5 ms, 5 ms, 10 ms or 50 ms. In both cases the light source is a Class 1 visible red semiconductor laser at 660 nm, certified to JIS/IEC/EN/FDA/GB-T, which means the beam is eye-safe for normal use and the visible spot makes alignment straightforward without extra eye-protection procedures.

For the installer, the key decision is which amplifier variant matches the head and the wiring scheme. Output is open-collector, available as NPN (LA21/LA7/LA24, SA21/SA7/SA24) or PNP (LA51/LA9/LA54, SA51/SA9/SA54), rated to 30 VDC and 100 mA maximum load, so these drive a PLC input or a small relay directly but are not intended to switch significant power. Configurations come as either two-output-plus-one-input or one-output-plus-one-input, and the connection style is what differentiates the part numbers within each polarity: pre-wired 2 m cable (LA21/LA51/SA21/SA51), wire-saving connector (LA7/LA9/SA7/SA9) or M8 connector (LA24/LA54/SA24/SA54). Supply is a flexible 10 to 30 VDC including 10% ripple, which suits standard 24 VDC machine cabinets. The S-family triangulation amplifiers turn a measured distance into a switching decision via a settable threshold, so the same hardware can act either as a binary trigger or as a go/no-go dimensional gate depending on how you teach it.

Physically these are compact DIN-rail or clip-mount amplifier blocks: a polycarbonate case and cover, PVC cable, and roughly 75 g per pre-wired unit. The amplifier carries only an IP50 rating, so it belongs inside an enclosure or control cabinet, while the paired E3NC-LH/SH heads are the IP67 components that go out on the machine in the wet or dusty zone. Operating temperature is -25 to 55 C for groups of one or two units, derated to -25 to 40 C once you chain 17 to 30 units side by side, which is the practical limit on how densely you can pack a measurement block. For higher-level integration the LA0/SA0 networking models drop the discrete I/O entirely and connect through an E3NW communications unit, exposing the sensor data over EtherCAT (E3NW-ECT), CC-Link (E3NW-CCL) or CompoNet (E3NW-CRT), with up to 30 amplifier units chainable per group so a whole bank of laser measurements reaches the controller over a single fieldbus drop.

Best for

  • High-speed presence and edge detection on fast lines, using an E3NC-L amplifier with a through-beam or retro-reflective head and the 80 us response mode to catch small or rapidly moving parts
  • Distance-settable measurement and go/no-go gating with an E3NC-S triangulation amplifier, where a taught threshold turns measured distance into a pass/fail switching output for dimensional checks
  • Cabinet-mounted signal processing for laser heads working in harsh IP67 zones, keeping the IP50 amplifier protected inside the enclosure while the head sits out on the machine
  • Fieldbus-integrated multi-point measurement using LA0/SA0 networking amplifiers and an E3NW unit to bring up to 30 chained channels onto EtherCAT, CC-Link or CompoNet
  • Standard 24 VDC machine builds needing NPN or PNP open-collector outputs wired straight into PLC inputs across electronics, automotive, packaging and food-and-beverage cells

Selection notes

  • Match the amplifier family to the task: E3NC-L (response down to 80 us) for fast presence detection, E3NC-S (1.5 to 50 ms) for distance-settable triangulation measurement. The amplifier must be paired with the corresponding E3NC-LH or E3NC-SH head.
  • Choose output polarity to suit the PLC: NPN variants (LA21/LA7/LA24, SA21/SA7/SA24) or PNP variants (LA51/LA9/LA54, SA51/SA9/SA54). Both are open-collector, limited to 30 VDC and 100 mA, so use a relay or contactor if you need to switch real load.
  • Select the connection style early, as it defines the part number within each polarity: pre-wired 2 m cable, wire-saving connector, or M8 connector. This affects panel layout and how easily a unit can be swapped.
  • Plan the thermal budget when chaining amplifiers. Rated -25 to 55 C for one or two units, but derated to -25 to 40 C for banks of 17 to 30 units, so dense blocks need cooler cabinet conditions.
  • Respect the IP split: the amplifier is only IP50 and must be enclosed, while the IP67 head handles the dusty or wet machine environment. For fieldbus rather than discrete I/O, specify the LA0/SA0 networking models plus the matching E3NW communications unit (EtherCAT, CC-Link or CompoNet).

Specifications: General
BrandOmron / Sentech
Sensor typeLaser distance / presence sensor amplifier (E3NC Smart Laser Sensor)

Specifications: Performance
Response timeE3NC-L: 80 us / 250 us / 1 ms / 16 ms; E3NC-S: 1.5 ms / 5 ms / 10 ms / 50 ms (selectable response modes)

Specifications: Interface
CommunicationNetworking models E3NC-LA0 / E3NC-SA0 connect via E3NW communications unit: EtherCAT (E3NW-ECT), CC-Link (E3NW-CCL) or CompoNet (E3NW-CRT)
ConnectionPre-wired 2 m cable (LA21/LA51/SA21/SA51), wire-saving connector (LA7/LA9/SA7/SA9) or M8 connector (LA24/LA54/SA24/SA54)

Specifications: Electrical
Supply voltage10 to 30 VDC (including 10% ripple p-p)
Power consumption1560 W

Specifications: Environment
Operating temperatureOperating -25 to 55 °C (groups of 1-2 units; derated to -25 to 40 °C for 17-30 units); storage -30 to 70 °C
IP ratingIP50 (amplifier unit); paired sensor heads rated IEC IP67

Specifications: Sensing
Sensing methodLaser triangulation (E3NC-S CMOS heads) / through-beam, retro-reflective and diffuse-reflective (E3NC-L heads)
Light sourceVisible semiconductor red laser diode, 660 nm, Class 1 (JIS/IEC/EN/FDA/GB-T)

Specifications: Output
Output typeNPN open-collector (LA21/LA7/LA24, SA21/SA7/SA24) or PNP open-collector (LA51/LA9/LA54, SA51/SA9/SA54); 30 VDC max, 100 mA max load

Specifications: Mechanical
Housing materialCase and cover: Polycarbonate (PC); cable: PVC (vinyl chloride)
WeightApprox. 75 g (pre-wired amplifier unit only); approx. 115 g packed

Frequently asked questions

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