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Multiple Web Width Measurement — Digital Monitoring — SCU6x

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✓ What You'll Achieve

After completing this guide, wired to your SCU6x controller with combined pass/fail monitoring output — all lanes within tolerance or any lane out of tolerance — on NPN digital outputs for your stacklight, alarm, or PLC.

Estimated time: ~3–4 hours (includes overlap teaching)

☐ What You Need

SCU6x Digital Monitoring

Which controller variant? Digital monitoring provides a combined pass/fail across all lanes (not per-lane), because the controller has only 3 NPN outputs. For per-lane monitoring, use the Industrial Ethernet path.

Prerequisites

Sensor size selection: Single sensor: sensing range must cover all lanes (including gaps) plus lateral wander margin. Two sensors: each sensor covers a portion of the total lane span, and the combined coverage must span all lanes with margin.

SCU6x Output Options

SCU6x models differ by output: DIO provides a combined GO/NO-GO pass/fail across all lanes, C(x)D provides per-lane data over Industrial Ethernet, and C(x)DIO provides both. (SCU6x has no analog output.)

ModelOutputs
SCU6x DIOCombined GO/NO-GO pass/fail across all lanes (not per-lane)
SCU6x C(x)DIOCombined all-lane GO/NO-GO pass/fail, plus per-lane width data over Industrial Ethernet

1 Install the Sensor

Multiple web width measurement uses free span mounting (web unsupported between rollers). Install the sensor so that the length of the sensor is parallel to the cross-machine direction (the width direction of the web). All strips and gaps must be visible within the sensor field of view.

Dual Sensor Installation: For dual-sensor multi-width measurement, mount both sensors with the same camera orientation, then set their electronic orientation oppositely — one referencing the left edge of the lane span, the other the right. Teach the overlap region so the controller stitches the two fields of view.

Two Sensor Setup (SCU6x Only)

  • Mount both sensors side by side so their combined fields of view cover all lanes
  • Overlap the fields of view — the two sensors must have an overlapping region so no edge falls in a dead zone between them
  • Mount both with the same camera (physical) orientation, but set their electronic orientation oppositely — one sensor referencing the left edge of the span, the other the right
  • The sensors do not physically overlap — they are mounted side by side, but their sensing ranges overlap
  • Not available for 1DC — use SCU6x with two ODC sensors for wide lane spans
Light source: Infrared (IR) — default for edge-based detection of multiple strips.

Reference Documents

2 Wire the System

Sensor connects via Quick Disconnect cable. Digital monitoring output via M12 connector.

  1. Sensor: Connect Quick Disconnect Sensor Cable (U2-01975) from ODC sensor to SCU6x port S1 (and S2 for two sensors)
  2. Power: Connect 24 V DC Input Power Cable for SCU6x or 1DC (21218x-5m) to SCU6x port Z2
  3. Digital I/O: Connect M12 12-pin Digital I/O Cable (21228-3m) from SCU6x port P2 to stacklight/alarm/PLC digital inputs
NPN 24V-compatible outputs. Combined pass/fail signal for all lanes. Configuration via SCU6x touchscreen.
Dual Sensor Wiring: Connect second sensor cable to controller port S2.

3 Configure & Verify

The SCU6x and 1DC share the same controller firmware with a dedicated multiple web width measurement mode that auto-detects lanes and computes per-lane widths.

Two Sensor Overlap Setup (SCU6x Only)

Two sensors with overlapping fields of view cover wide lane spans. An additional calibration step establishes the overlap between sensors.

  1. Complete single-sensor configuration for each sensor individually
  2. Present a single strip of known width that spans the overlap zone between the two sensors
  3. Position it so one edge is seen by only sensor 1 and the other edge by only sensor 2, while the strip passes through the overlap zone
  4. Enter the known width on the controller and press the Teach Overlap/Offset button
  5. The controller measures each sensor's contribution and computes the overlap distance
  6. Alternatively, if you know the exact physical overlap, enter it manually via the touchscreen or App
After overlap calibration, proceed with the same multi-web configuration steps — enable multiple web mode, optionally teach individual lane corrections and patterns.
What success looks like: Both sensors show green indicators, lane count reflects all lanes across both sensors, width values correct for lanes in the overlap zone.

Common Configuration Mistakes

  • Gaps between strips too small — controller cannot distinguish adjacent lanes (see Install for the minimum gap).
  • Forgetting to press Apply after changing parameters
  • Confusing teach overlap with teach correction — they are separate operations
  • Overlap teaching sample doesn't span correctly — one edge must be in sensor 1 only, other edge in sensor 2 only
  • Not re-teaching overlap after moving sensors — width readings drift for lanes in the overlap zone

View full configuration documentation

Watch

▶ How to Set the SCU6x Controller for Multiple Web Width Measurement ▶ Advanced Multiple Web Width Measurement — SCU6x Controller and App Integration

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