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Omron / Sentech ZX2-LDA11 / ZX2-LDA41 (amplifier units) machine vision sensor
Omron / SentechLaser measurement sensors
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Omron / Sentech ZX2-LDA11 / ZX2-LDA41 Laser Displacement Sensor Amplifier Units

ZX2-LDA11

The ZX2-LDA11 and ZX2-LDA41 are DIN-rail-mounted amplifier units for the Omron ZX2 series CMOS laser displacement sensor system, differing only in transistor polarity (NPN vs PNP). They accept input from ZX2-LD sensor heads (ZX2-LD50, LD50L, LD100, LD100L, LD50V) and provide analog output switchable between 4–20 mA current or ±5 V / 1–5 V voltage, plus three open-collector judgment outputs (HIGH/PASS/LOW). The minimum measurement period is 30 µs with 15 selectable response times from 60 µs to 500 ms, and an 11-segment display allows on-unit configuration. Advanced functions include smart tuning, peak/bottom hold, zero reset, mutual interference prevention for up to five units, and a 4-bank switching function.

Brand
Omron / Sentech
Sensor type
Laser displacement (CMOS type)
Sensing method
Laser triangulation (CMOS)
Light source
Red semiconductor laser (Class 2)
Output type
NPN open-collector (ZX2-LDA11) / PNP open-collector (ZX2-LDA41); analog: 4–20 mA or ±5 VDC / 1–5 VDC
Response time
60 µs to 500 ms (15 selectable steps: 60 µs, 120 µs, 240 µs, 500 µs, 1 ms, 2 ms, 4 ms, 8 ms, 12 ms, 20 ms, 36 ms, 66 ms, 128 ms, 250 ms, 500 ms)
Supply voltage
10 to 30 VDC, including 10% ripple (p-p)
Operating temperature
Operating: 0 to +50°C; Storage: –15 to +70°C
IP rating
IP40 (IEC60529)
Connection
Prewired; standard cable length 2 m; vinyl insulated round cable, 5.2 mm dia., 11 conductors
Housing material
Case: PBT (polybutylene terephthalate); Cover: Polycarbonate; Buttons: Polyacetal; Cable: PVC
Dimensions
72 mm (W) × 47.6 mm (H) × 36.8 mm (D); cover open: 84.6 mm wide
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Technical overview

The ZX2-LDA11 (NPN) and ZX2-LDA41 (PNP) are DIN-rail-mounted amplifier units at the heart of Omron's ZX2 modular laser displacement system. They accept input from any ZX2-LD series sensor head — the LD50, LD50L, LD100, LD100L, or LD50V — and translate raw CMOS triangulation data into industrially actionable signals. The core measurement engine achieves a minimum measurement period of 30 µs and exposes 15 selectable response-time steps spanning 60 µs to 500 ms (60 µs, 120 µs, 240 µs, 500 µs, 1 ms, 2 ms, 4 ms, 8 ms, 12 ms, 20 ms, 36 ms, 66 ms, 128 ms, 250 ms, 500 ms). This wide range is deliberately chosen: steps in the 60–240 µs band suit high-speed part detection on fast-moving conveyor lines, while steps in the 8–66 ms band provide heavier averaging that improves stability on vibrating fixtures or rough surfaces. Installers can select the fastest step whose noise floor still meets their tolerance budget — the 11-segment front-panel display and smart tuning function make this on-unit, tool-free calibration straightforward.

Output flexibility is a defining feature of these amplifiers. The analog output is field-switchable between 4–20 mA current loop and ±5 VDC or 1–5 VDC voltage modes, meaning the same hardware can feed a PLC analog card, a data-acquisition system, or a process controller without rewiring — only a configuration change on the unit is required. Alongside the analog channel, three open-collector judgment outputs (HIGH, PASS, LOW) provide hard-wired threshold decisions for reject gates, alarms, or robot handshakes without any upstream processing. The NPN/PNP split between the LDA11 and LDA41 covers virtually every PLC and safety-relay input card in the field; the choice is purely determined by the sink/source wiring convention of the target controller. The 11-conductor, 2 m prewired cable also carries discrete inputs for laser OFF, zero reset, timing, reset, and bank switching, enabling synchronized multi-step measurement sequences directly from the machine controller.

For multi-sensor installations the built-in mutual interference prevention supports up to five ZX2 amplifier units sharing a mounting rail without cross-talk — critical in tight panel layouts where adjacent laser beams would otherwise corrupt readings. The 4-bank switching function lets a single amplifier store and switch between four independent threshold or output-scaling configurations under external PLC control, which is particularly useful on flexible assembly lines that run multiple part variants. The housing is a DIN-rail PBT case with a polycarbonate cover, rated IP40, and rated for 0–50 °C operation (storage −15 to +70 °C). The 10–30 VDC wide-range supply means no separate regulated PSU is required on most 24 VDC machine control panels. At approximately 135 g (main unit) and 72 × 47.6 × 36.8 mm with cover closed, the unit occupies a single compact DIN slot, and the cover opens to 84.6 mm wide for front-panel access during commissioning.

Best for

  • High-speed dimensional gauging on production lines where part height, step, or gap must be confirmed within sub-millisecond cycle budgets — the 60 µs minimum response time and analog output feed PLC control loops without camera-system latency.
  • Flexible multi-variant assembly cells running four or more distinct part types: the 4-bank switching function stores separate threshold sets and switches under PLC command, eliminating manual re-teach between changeovers.
  • Robot-guidance applications requiring a hard-wired trigger-ready architecture — the timing and zero-reset inputs synchronise the amplifier with robot axes, while the three judgment outputs drive gripper accept/reject logic directly.
  • Panel-space-constrained cabinets housing multiple displacement axes: mutual interference prevention for up to five units on the same rail removes the need for physical separation or time-multiplexed firing circuits.
  • Mixed NPN/PNP machine environments or brownfield retrofits where the site wiring standard is fixed: selecting LDA11 (NPN) or LDA41 (PNP) matches the existing PLC I/O card without rewiring the cabinet.

Selection notes

  • NPN vs PNP is the single mandatory decision before ordering: ZX2-LDA11 for NPN (sink) PLC inputs, ZX2-LDA41 for PNP (source) inputs. The two models are otherwise electrically and mechanically identical, and the part number cannot be field-converted.
  • The amplifier does not contain its own sensing optics — a ZX2-LD sensor head (ZX2-LD50, ZX2-LD50L, ZX2-LD100, ZX2-LD100L, or ZX2-LD50V) must be ordered separately and matched to the required standoff distance, spot size, and measurement range for the application.
  • Analog output mode (4–20 mA vs ±5 V / 1–5 V) is selectable on the unit, but confirm the receiving analog input card's impedance and range before wiring: the current-loop 4–20 mA mode is preferred in electrically noisy environments because it is inherently immune to voltage drop over long cable runs.
  • The IP40 rating protects against solid objects larger than 1 mm but provides no water ingress protection — the amplifier must be mounted inside a sealed enclosure (minimum IP54 cabinet) if the installation involves wash-down, coolant mist, or outdoor exposure.
  • Response time selection directly trades measurement noise for speed: at 60–240 µs the averaging window is very short and surface reflectivity variations or vibration will appear as reading scatter; stepping to 1–8 ms is recommended as a starting point for most dimensional gauging tasks, with the smart tuning function used to verify stability before committing.

Specifications: General
BrandOmron / Sentech
Sensor typeLaser displacement (CMOS type)

Specifications: Performance
Response time60 µs to 500 ms (15 selectable steps: 60 µs, 120 µs, 240 µs, 500 µs, 1 ms, 2 ms, 4 ms, 8 ms, 12 ms, 20 ms, 36 ms, 66 ms, 128 ms, 250 ms, 500 ms)

Specifications: Interface
ConnectionPrewired; standard cable length 2 m; vinyl insulated round cable, 5.2 mm dia., 11 conductors
CommunicationDigital I/O (laser OFF, zero reset, timing, reset, bank inputs)

Specifications: Electrical
Supply voltage10 to 30 VDC, including 10% ripple (p-p)
Power consumption3000 W

Specifications: Environment
Operating temperatureOperating: 0 to +50°C; Storage: –15 to +70°C
IP ratingIP40 (IEC60529)

Specifications: Sensing
Sensing methodLaser triangulation (CMOS)
Light sourceRed semiconductor laser (Class 2)

Specifications: Output
Output typeNPN open-collector (ZX2-LDA11) / PNP open-collector (ZX2-LDA41); analog: 4–20 mA or ±5 VDC / 1–5 VDC

Specifications: Mechanical
Housing materialCase: PBT (polybutylene terephthalate); Cover: Polycarbonate; Buttons: Polyacetal; Cable: PVC
Dimensions72 mm (W) × 47.6 mm (H) × 36.8 mm (D); cover open: 84.6 mm wide
WeightApprox. 200 g (packed); main unit only approx. 135 g

Frequently asked questions

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