---
title: "Quick Start: Multiple Web Width Measurement — Digital Monitoring — SCU6x"
application: multi-web-width
variant: digital
controller: scu6x
valid_sensors: ["ODC 48", "ODC 96", "ODC 192", "ODC 288", "ODC 384", "ODC 480", "ODC 768", "ODC 960"]
output_type: digital
estimated_time: "~2–3 hours (single sensor), ~3–4 hours (includes overlap teaching) (dual sensor)"
last_updated: "2026-07-14"
guide_url: "https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x"
pdf_url: "https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.pdf"
---

# Quick Start: Multiple Web Width Measurement — Digital Monitoring — SCU6x

> Install, wire, and configure a Roll-2-Roll® ODC sensor with a SCU6x controller for multiple web width measurement via Digital Monitoring.

## 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:** ~2–3 hours (single sensor), ~3–4 hours (includes overlap teaching) (dual sensor)

## What You Need

### Products

- ODC Family sensor — select size so sensing range covers all lanes plus wander margin
- SCU6x controller (any variant)
- Quick Disconnect Sensor Cable - 3m (10 ft) (U2-01975)
- 24 V DC Input Power Cable for SCU6x or 1DC - 5m (21218x-5m)
- M12 12-pin Digital I/O Cable (3m) (21228-3m)
- 24 VDC power supply
- For two sensors: second ODC Family sensor + second sensor cable (U2-01975)

*Note: 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

- Machine accessible and safe to work on
- 24 VDC power available at the installation location
- Sensor mounting location identified — plan where to install one or two sensors within the machine frame for optimal coverage of all lanes
- For Ethernet paths: Ethernet network ready (switch port available, IP address planned)
- For Digital Monitoring path: stacklight, alarm, or PLC digital input wired and ready
- Strips or lanes running (or available to run) for initial setup and teaching
- For two-sensor overlap setup: a single strip of known width, wide enough to span the overlap zone between the two sensors

## 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.)

| Model | Outputs |
|-------|---------|
| SCU6x DIO | Combined GO/NO-GO pass/fail across all lanes (not per-lane) |
| SCU6x C(x)DIO | Combined all-lane GO/NO-GO pass/fail, plus per-lane width data over Industrial Ethernet |

## Install

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.

### Single Sensor Setup

- Position the sensor so all lanes and gaps are visible within the sensor field of view
- Allow margin on the outer edges for lateral wander
- Mount closer to one roller to minimize web flutter
- Ensure the web plane is parallel to the sensor length axis
- Minimum gap between strips: approximately 2 mm for the controller to distinguish individual lanes

### 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.

**Sensor sizing:** 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.

**Reference documents:**

- [Sensor Installation Recommendations (inspection applications)](https://r2r.tech/documentation/manuals/sensor-installation-recommendations-inspection-applications.md)

## Wire

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

*Note: NPN 24V-compatible outputs. Combined pass/fail signal for all lanes. Configuration via SCU6x touchscreen.*

## 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.

### Single Sensor Configuration

One sensor sees all lanes. The controller processes the sensor image, detects every edge, identifies gaps between strips, and computes the width of each lane automatically.

1. Power on — the sensor detects all edges and the touchscreen shows the sensor image
2. Navigate to the Width screen and select Multiple Web (instead of Single Web)
3. The controller auto-detects all lanes and displays the number of lanes and per-lane widths
4. Use the arrow keys on the touchscreen to scroll through individual lane widths
5. Optionally use the Roll-2-Roll App for configuration instead of the touchscreen

**Teaching:**

1. Present strips of known width in front of the sensor
2. Select the lane to teach (SCU6x: on the touchscreen or App; 1DC: via the App)
3. Enter the known width and press the Teach Correction button
4. The controller stores the correction for that lane
5. Repeat for each lane that needs correction

**Success:** Touchscreen shows per-lane width values, updating in real time as lanes change.

### 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

*Note: After overlap calibration, proceed with the same multi-web configuration steps — enable multiple web mode, optionally teach individual lane corrections and patterns.*

**Success:** Both sensors show green indicators, lane count reflects all lanes across both sensors, width values correct for lanes in the overlap zone.

### Pattern Teaching (Optional)

Locks in expected lane positions and widths. After teaching, the controller alerts on deviation — useful for slitter rewinders where blade positions are set and should remain constant during a run.

1. Ensure all lanes are running at correct widths and positions
2. Activate pattern teaching mode on the touchscreen or App
3. The controller stores the current lane positions, widths, and count as the reference pattern

*Note: After pattern teaching, the controller alerts when: a lane shifts from its taught position, a lane width deviates from its taught value, a lane disappears, or an unexpected new lane appears.*

**Success:** Pattern teaching indicator active. Controller alerts immediately if a strip is removed, added, or shifted.

### Digital Monitoring Setup

For the digital monitoring path (SCU6x only).

1. Enable multiple web mode on the touchscreen
2. Set the nominal width for the lanes
3. Set the upper limit and lower limit tolerance
4. NPN outputs provide combined pass/fail: all lanes within tolerance = OK; any lane out of tolerance = alert
5. Touchscreen still shows per-lane width data — digital output is just the combined signal

*Note: If the SCU6x has the C(x) Ethernet option, thresholds can also be set remotely via Ethernet.*

**Success:** Per-lane widths visible on touchscreen. NPN outputs inactive when all lanes within tolerance. Remove or shift a strip to verify the alert activates.

### 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

**Configuration reference:** [Controller Documentation](https://r2r.tech/documentation/manuals/scu6x-industrial-ethernet-register-map-v41.md)

## Go Further

### Related Quick Start Guides

- [Web Width Measurement (Edge-Based)](https://r2r.tech/resources/quick-start/web-width/ethernet/scu6x.md) — Single web width measurement with SCU5, SCU6x, or 1DC
- [Position Measurement](https://r2r.tech/resources/quick-start/position-measurement/ethernet/scu6x.md) — Edge, centerline, or contrast/line position measurement
- [Splice Detection](https://r2r.tech/resources/quick-start/splice-detection/ethernet/scu6x.md) — Can run simultaneously with multi-web width measurement on the same hardware

### Learn More

- [Web Width Measurement and Monitoring](https://r2r.tech/articles/web-width-measurement.md)

### Reference Documents

- [SCU6x Controller User Manual](https://r2r.tech/documentation/manuals/scu6x-sensor-and-web-guide-controller-user-manual.md)
- [SCU6x Industrial Ethernet Register Map](https://r2r.tech/documentation/manuals/scu6x-industrial-ethernet-register-map-v41.md)
- [Sensor Installation Recommendations (inspection applications)](https://r2r.tech/documentation/manuals/sensor-installation-recommendations-inspection-applications.md)

## Available Sensor Models

Select a sensor model at the guide page to see datasheets, 2D drawings, 3D models, and STEP file downloads.

- [ODC 48](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md?sensor=odc-48) (48 mm)
- [ODC 96](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md?sensor=odc-96) (96 mm)
- [ODC 192](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md?sensor=odc-192) (192 mm)
- [ODC 288](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md?sensor=odc-288) (288 mm)
- [ODC 384](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md?sensor=odc-384) (384 mm)
- [ODC 480](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md?sensor=odc-480) (480 mm)
- [ODC 768](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md?sensor=odc-768) (768 mm)
- [ODC 960](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md?sensor=odc-960) (960 mm)

## Related Quick Start Guides

- [Splice Detection — Industrial Ethernet — 1DC Series](https://r2r.tech/resources/quick-start/splice-detection/ethernet/1dc.md)
- [Splice Detection — Industrial Ethernet — SCU6x](https://r2r.tech/resources/quick-start/splice-detection/ethernet/scu6x.md)
- [Splice Detection — Digital Output — SCU6x](https://r2r.tech/resources/quick-start/splice-detection/digital/scu6x.md)
- [Position Measurement — Analog Output — SCU5](https://r2r.tech/resources/quick-start/position-measurement/analog/scu5.md)
- [Position Measurement — Industrial Ethernet — SCU5](https://r2r.tech/resources/quick-start/position-measurement/ethernet/scu5.md)
- [Position Measurement — Industrial Ethernet — SCU6x](https://r2r.tech/resources/quick-start/position-measurement/ethernet/scu6x.md)
- [Position Measurement — Industrial Ethernet — 1DC Series](https://r2r.tech/resources/quick-start/position-measurement/ethernet/1dc.md)
- [Web Width Measurement — Analog Output — SCU5](https://r2r.tech/resources/quick-start/web-width/analog/scu5.md)
- [Web Width Measurement — Digital Monitoring — SCU5](https://r2r.tech/resources/quick-start/web-width/digital/scu5.md)
- [Web Width Measurement — Industrial Ethernet — SCU5](https://r2r.tech/resources/quick-start/web-width/ethernet/scu5.md)
- [Web Width Measurement — Digital Monitoring — SCU6x](https://r2r.tech/resources/quick-start/web-width/digital/scu6x.md)
- [Web Width Measurement — Industrial Ethernet — SCU6x](https://r2r.tech/resources/quick-start/web-width/ethernet/scu6x.md)
- [Web Width Measurement — Industrial Ethernet — 1DC Series](https://r2r.tech/resources/quick-start/web-width/ethernet/1dc.md)
- [Multiple Web Width Measurement — Industrial Ethernet — SCU6x](https://r2r.tech/resources/quick-start/multi-web-width/ethernet/scu6x.md)
- [Multiple Web Width Measurement — Industrial Ethernet — 1DC Series](https://r2r.tech/resources/quick-start/multi-web-width/ethernet/1dc.md)

## Support

- Email: experts@r2r.tech
- Phone: +1-888-290-3215