---
title: "Quick Start: Retrofit an Existing Web Guide — Master-Slave Guiding — SCU6x"
application: retrofit
variant: master-slave
controller: scu6x
valid_sensors: ["ODC 48", "ODC 96", "ODC 192", "ODC 288", "ODC 384", "ODC 480", "ODC 768", "ODC 960"]
output_type: master-slave
estimated_time: "varies"
last_updated: "2026-09-16"
guide_url: "https://r2r.tech/resources/quick-start/retrofit/master-slave/scu6x"
pdf_url: "https://r2r.tech/resources/quick-start/retrofit/master-slave/scu6x.pdf"
---

# Quick Start: Retrofit an Existing Web Guide — Master-Slave Guiding — SCU6x

> Install, wire, and configure a Roll-2-Roll® ODC sensor with a SCU6x controller for retrofit an existing web guide.

## What You'll Achieve

After completing this guide, your existing guide runs on Roll-2-Roll control with the slave web following the master web's side-to-side position — the new actuator keeps the two layers aligned.

## What You Need

### Products

- [SCU6x](https://r2r.tech/products/sensor-controller/scu6x) web-guide controller, as ordered for your actuator
- Roll-2-Roll LHS linear actuator, supplied in your kit
- Two ODC Family infrared sensors — one master, one slave, on the two web paths
- Quick Disconnect Sensor Cable - 3m (10 ft) (U2-01975)
- Second Quick Disconnect Sensor Cable (U2-01975) for the slave sensor
- Sensor mounting rail and bracket (SKU 7-020001 for 1 in sensors, SKU 7-020006 for 1.5 in)
- 24 V DC Input Power Cable for SCU6x or 1DC - 5m (21218x-5m)
- Actuator cordset matched to your LHS model (SKU 21224 for LHS-005/020, SKU 21225 for LHS-030)
- Servo-center proximity sensor (SKU 7-140004)
- 24 VDC power supply, 5 A minimum (SKU 0-100006)

### Prerequisites

- The machine is shut down and locked out per your facility's procedures.
- Your existing web-guide frame and carriage are structurally sound, and the carriage moves freely through its full travel by hand.
- A 24 VDC supply (5 A minimum) is available at the install location.
- Your web material is on the machine, ready to thread through the guide.
- Keep the SCU6x Sensor and Web Guide Controller User Manual within reach (/documentation/manuals/scu6x-sensor-and-web-guide-controller-user-manual) — you'll use it while commissioning.

## Install the Web Guide

Install the Roll-2-Roll sensor, controller, and actuator onto your existing web-guide structure — reuse the mechanical carriage, replace the controls.

### Confirm the Existing Web-Guide Frame

- Confirm the frame is still solidly bolted to the machine through its base-plate holes, with no loose or missing fasteners.
- Confirm the web travels in the direction of the arrows on the frame. The guide corrects in one direction only, so a frame turned around during its service life fights the web instead of steering it.
- Confirm the frame is level — rollers parallel to the machine idlers and square to web travel, with no tilt to either side. Check it with a machine square, a tram rod, or by measuring from each entry and exit roller to the guide roller.
- Rock the moving carriage by hand and feel for play in the guide bearings. Slop or a notchy, catching feel means worn bearings — plan to clean or replace them before you fit the new actuator.

### Evaluate and Remove the Old Actuator

- Before you disturb anything, sketch or photograph how the old actuator attaches at both ends — to the machine frame at one end, the moving carriage at the other. Record the orientation, the pivot or bolt pattern, and the fastener sizes; you'll match the new actuator to this geometry.
- Note the old actuator's fully-retracted and fully-extended positions against the frame's travel extremes — this is the stroke the guide actually uses.
- Remove the old actuator. Mark and store its mounting hardware, and keep any pivot pins or brackets you plan to reuse.
- With the old actuator off, move the guide carriage by hand through its full range. It should slide smoothly end to end with no binding, notching, or stiff spots. If it binds, clean and re-lubricate or replace the guide bearings before you go on — a new actuator can't compensate for a structure that doesn't move freely.

### Install the New Actuator

- Bench-test the new actuator before you mount it. Connect its cables to the controller, apply 24 VDC, and jog it end to end from the operator interface. It should travel smoothly the full stroke. If it doesn't move or it stalls, re-check the cabling and the supply before you commit it to the machine.
- Identify your mount type from the actuator's suffix — an -RF suffix is a fixed mount (a bolt-down mounting plate), and a -TG suffix is a floating mount (pinned, with a rod eye at the front and a spherical bearing or clevis at the rear). Either way, mount the new actuator in the same orientation as the one you removed, with its line of motion exactly in line with the carriage travel.
- Fixed (-RF) mount — fasten the mounting plate so the actuator's linear motion is exactly in line with the existing carriage. Attach the front end to the moving structure through the threaded holes, bolts, or pivot pins that match the old actuator's orientation, and apply thread-locker to any fastener screwed directly into the actuator.
- Floating (-TG) mount — connect the front rod eye to the moving carriage and the rear spherical bearing or clevis to the frame. Add an anti-rotation feature at the spherical-bearing end so the actuator body can't spin, and let the pins carry the rotation so the actuator self-aligns as the guide moves.
- Check the alignment — jog the guide slowly across its full travel and watch it move without struggling or binding. If it fights at any point, loosen the mounts, re-square the actuator to the carriage, and re-check.
- Match the stroke to the guide travel — confirm the actuator's fully-retracted and fully-extended positions coincide with the frame's travel extremes, and center the stroke on the raceway center. If the actuator over-travels the guide, reduce the digital stroke length in the controller; if it under-travels, add mechanical stops.
- Install the servo-center proximity sensor (SKU 7-140004) so it switches exactly at mid-stroke — with the guide centered, position it to see metal within 2 mm for one half of the travel and clear space for the other half. Jog through mid-stroke and confirm its LED toggles on and off right at center; the controller uses this transition to find the actuator's home position during commissioning.

### Choose the Sensor Location and Mount the Sensor

- Mount the sensor in the exit span, just after the guide roller — as close to the roller as your machine allows. The sensor must see the corrected web; mounted anywhere else, guiding becomes unstable.
- Clamp the sensor bracket to its rail in the exit span, but don't fully tighten it yet.
- Set the working distance from the sensor face to the web to 5–15 mm (0.2–0.6 in), and keep the web within 5–30 mm of the sensor as it wanders during guiding.
- Keep everything at least 150 mm (6 in) behind the web clear in the sensor's view — the camera-style sensor can otherwise pick up background objects.
- Guiding a shiny, metallic, or clear web? Tilt the sensor a few degrees toward the web so its angled light returns to the lens, then re-check the working distance.
- Tighten the bracket.
- If the web plane visibly lifts or drops in the exit span when the guide corrects hard (you'll confirm this during commissioning), add a backup roller with minimal wrap just before the sensor to steady the web — then keep the sensor close. Don't move the sensor farther downstream to escape the problem; distance costs you guiding response.

### Pre-Power Mechanical Checks

- Do these with the power off, before you commission. With the new actuator mounted, don't force the guide by hand — you can back-drive the actuator.
- Confirm the web travels in the direction of the arrows on the frame.
- Confirm the new actuator is mounted in line with the carriage travel, in the same orientation as the one you removed.
- Confirm the actuator's retracted and extended limits line up with the frame's travel extremes.
- Confirm the servo-center proximity sensor is installed and its LED changes state as the carriage passes mid-stroke.
- Confirm every cable is routed and strain-relieved, and that nothing is powered yet.

**Reference documents:**

- [Retrofit Installation Checklist](https://r2r.tech/documentation/manuals/retrofit-installation-checklist.md)
- [Upgrade Kit Installation Checklist](https://r2r.tech/documentation/manuals/upgrade-kit-installation-checklist.md)

## Install the Sensor

### Install the Sensors — Master-Slave Guiding

- Master-slave guiding uses two ODC infrared sensors on two separate web paths: a master sensor on the master (reference) web and a slave sensor on the web this retrofitted guide steers.
- Line up the master and slave sensors at the same point across the machine, relative to the machine centerline.
- Make the web-path length from the master sensor to the lamination point equal to the path length from the slave sensor to the lamination point — this timing has to match.
- Mount the slave sensor in the exit span after its guide roller, as close to the roller as your machine allows, and mount both sensors the same way round.

## Configure & Verify

Power up the controller and commission the retrofitted guide, one checked step at a time.

### Master-Slave Guiding — Power Up and Commission

Commission master-slave guiding on your retrofitted guide — set up the slave guide first, then bring in the master so the slave web follows it.

1. Power on the controller. If it wakes in Automatic, switch to Manual — it resumes whatever mode it was last in, and every step below runs from Manual.
2. Set both sensors to edge sensing. The master sensor reads the master (reference) web; the slave sensor reads the web this guide steers.
3. Disable the master sensor for now — you'll commission the slave guide on its own first.
4. Set the slave sensor's orientation to Left or Right to match its edge, by pressing the sensor button (Sensor 1 or Sensor 2) on the home screen to cycle Left → Center → Right, and check it on the Web Position Indicator — you should see a dark region on the matching side. If it reads all dark or all light, fix the working distance or orientation before continuing.
5. Check the jog direction. Tap Jog Left, then Jog Right, and watch the guide. It should move the way each button says. If it moves the opposite way, reverse Motor Polarity under Power User → Actuator → Motor Polarity, then jog again to confirm.
6. Servo-center the actuator. Tap Servo Center and let the guide travel to its home position (half its stroke each way). If it heads away from home instead of toward it, reverse Servo Center Polarity under Power User → Actuator → Servo Center Polarity, then servo-center again. If it hits a mechanical stop before finishing, re-check the servo-center sensor position from the pre-power checks.
7. Set the guide point for the slave web, then switch to Automatic and confirm the slave web corrects the right way. If it steers away from the guide point, reverse Error Polarity under Power User → Controller, then watch it correct again. Get steady slave guiding before adding the master.
8. Enable the master sensor and set its orientation to match its edge the same way, by pressing the sensor button (Sensor 1 or Sensor 2) on the home screen to cycle Left → Center → Right, then check it on the Web Position Indicator. Turn on the master/slave function.
9. Confirm which sensor is master and which is slave — the master supplies the guide-point offset, the slave is the edge the actuator follows.
10. Check the master/slave polarity. Shift the master web off its sensor center and watch the slave web move the same way. If the slave web moves the opposite way, flip the master/slave polarity, then re-check.
11. Prove the safety hold. Lock on Lost Edge watches the slave web — pull the slave web out of its sensor's view and confirm the guide holds its last position. When the slave web tracks the master and the hold works, your retrofitted web guide is commissioned.

## PLC Integration

The controller accepts remote commands two ways — over Industrial Ethernet, or through the DIO option's discrete 24 V dry-contact inputs. Either lets a PLC command guide mode and position without touching the controller screen.

- Industrial Ethernet (C(x) models) — send auto-mode on/off, jog, servo-center, and guide-point commands over EtherNet/IP, PROFINET, or EtherCAT.
- DIO option — hard-wired 24 V NPN dry-contact inputs for remote on/off and mode switching, no Ethernet required, wired straight from PLC digital outputs or relay contacts.
- The two can run together — Ethernet for data and fine control, DIO for hard-wired interlocks.
- Lock on Lost Edge inhibits actuator motion when the guided edge leaves the sensor's view; Loss of Contrast Inhibit does the same when a taught line or contrast feature is lost.

**Register map:**

- [SCU6x Industrial Ethernet Register Map](https://r2r.tech/documentation/manuals/scu6x-industrial-ethernet-register-map-v41.md)

**Support files:**

- [EDS File (EtherNet/IP)](https://r2r.tech/documentation/support-files/ethernetip-eds-file-scu6x-firmware-version-41-using-hilscher-module.md)
- [Add-on Instruction (AOI) for Studio 5000](https://r2r.tech/documentation/support-files/rockwellab-add-instructions-scu6x-cedmced-controller-v41.md)

## Go Further

### Related Quick Start Guides

- [Intermediate Web Guide](https://r2r.tech/resources/quick-start/web-guiding-intermediate/edge/scu6x.md) — Install a new Roll-2-Roll web guide from scratch, when there's no existing structure to reuse
- [Web Width Measurement](https://r2r.tech/resources/quick-start/web-width/ethernet/scu6x.md) — Measure web width alongside or independently of guiding
- [Unwind/Rewind Web Guide](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/edge/scu6x.md) — Shift heavy rolls on a retrofitted unwind or rewind stand using a high-thrust RLA

### Reference Documents

- [Retrofit Installation Checklist](https://r2r.tech/documentation/manuals/retrofit-installation-checklist.md)
- [Upgrade-Kit Installation Checklist](https://r2r.tech/documentation/manuals/upgrade-kit-installation-checklist.md)
- [Servo Center and Servo Installation](https://r2r.tech/documentation/manuals/servo-center-servo-installation.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/retrofit/master-slave/scu6x.md?sensor=odc-48) (48 mm)
- [ODC 96](https://r2r.tech/resources/quick-start/retrofit/master-slave/scu6x.md?sensor=odc-96) (96 mm)
- [ODC 192](https://r2r.tech/resources/quick-start/retrofit/master-slave/scu6x.md?sensor=odc-192) (192 mm)
- [ODC 288](https://r2r.tech/resources/quick-start/retrofit/master-slave/scu6x.md?sensor=odc-288) (288 mm)
- [ODC 384](https://r2r.tech/resources/quick-start/retrofit/master-slave/scu6x.md?sensor=odc-384) (384 mm)
- [ODC 480](https://r2r.tech/resources/quick-start/retrofit/master-slave/scu6x.md?sensor=odc-480) (480 mm)
- [ODC 768](https://r2r.tech/resources/quick-start/retrofit/master-slave/scu6x.md?sensor=odc-768) (768 mm)
- [ODC 960](https://r2r.tech/resources/quick-start/retrofit/master-slave/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 — Digital Monitoring — SCU6x](https://r2r.tech/resources/quick-start/multi-web-width/digital/scu6x.md)
- [Multiple Web Width Measurement — Industrial Ethernet — 1DC Series](https://r2r.tech/resources/quick-start/multi-web-width/ethernet/1dc.md)
- [Intermediate Web Guide — Edge Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-intermediate/edge/scu5.md)
- [Intermediate Web Guide — Edge Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-intermediate/edge/scu6x.md)
- [Intermediate Web Guide — Center Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-intermediate/center/scu5.md)
- [Intermediate Web Guide — Center Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-intermediate/center/scu6x.md)
- [Intermediate Web Guide — Line Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-intermediate/line/scu5.md)
- [Intermediate Web Guide — Line Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-intermediate/line/scu6x.md)
- [Intermediate Web Guide — Contrast Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-intermediate/contrast/scu5.md)
- [Intermediate Web Guide — Contrast Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-intermediate/contrast/scu6x.md)
- [Intermediate Web Guide — Master-Slave Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-intermediate/master-slave/scu5.md)
- [Intermediate Web Guide — Master-Slave Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-intermediate/master-slave/scu6x.md)
- [Intermediate Web Guide — Open-Loop Oscillation — SCU5](https://r2r.tech/resources/quick-start/web-guiding-intermediate/oscillation-open/scu5.md)
- [Intermediate Web Guide — Open-Loop Oscillation — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-intermediate/oscillation-open/scu6x.md)
- [Intermediate Web Guide — Closed-Loop Oscillation — SCU5](https://r2r.tech/resources/quick-start/web-guiding-intermediate/oscillation-closed/scu5.md)
- [Intermediate Web Guide — Closed-Loop Oscillation — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-intermediate/oscillation-closed/scu6x.md)
- [Unwind/Rewind Web Guide — Edge Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/edge/scu5.md)
- [Unwind/Rewind Web Guide — Edge Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/edge/scu6x.md)
- [Unwind/Rewind Web Guide — Center Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/center/scu5.md)
- [Unwind/Rewind Web Guide — Center Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/center/scu6x.md)
- [Unwind/Rewind Web Guide — Line Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/line/scu5.md)
- [Unwind/Rewind Web Guide — Line Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/line/scu6x.md)
- [Unwind/Rewind Web Guide — Contrast Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/contrast/scu5.md)
- [Unwind/Rewind Web Guide — Contrast Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/contrast/scu6x.md)
- [Unwind/Rewind Web Guide — Oscillation (Open Loop) — SCU5](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/oscillation-open/scu5.md)
- [Unwind/Rewind Web Guide — Oscillation (Open Loop) — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/oscillation-open/scu6x.md)
- [Unwind/Rewind Web Guide — Oscillation (Closed Loop) — SCU5](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/oscillation-closed/scu5.md)
- [Unwind/Rewind Web Guide — Oscillation (Closed Loop) — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/oscillation-closed/scu6x.md)
- [Unwind/Rewind Web Guide — Master/Slave Guiding — SCU5](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/master-slave/scu5.md)
- [Unwind/Rewind Web Guide — Master/Slave Guiding — SCU6x](https://r2r.tech/resources/quick-start/web-guiding-unwind-rewind/master-slave/scu6x.md)
- [Retrofit an Existing Web Guide — Edge Guiding — SCU5](https://r2r.tech/resources/quick-start/retrofit/edge/scu5.md)
- [Retrofit an Existing Web Guide — Edge Guiding — SCU6x](https://r2r.tech/resources/quick-start/retrofit/edge/scu6x.md)
- [Retrofit an Existing Web Guide — Center Guiding — SCU5](https://r2r.tech/resources/quick-start/retrofit/center/scu5.md)
- [Retrofit an Existing Web Guide — Center Guiding — SCU6x](https://r2r.tech/resources/quick-start/retrofit/center/scu6x.md)
- [Retrofit an Existing Web Guide — Contrast Guiding — SCU5](https://r2r.tech/resources/quick-start/retrofit/contrast/scu5.md)
- [Retrofit an Existing Web Guide — Contrast Guiding — SCU6x](https://r2r.tech/resources/quick-start/retrofit/contrast/scu6x.md)
- [Retrofit an Existing Web Guide — Line Guiding — SCU5](https://r2r.tech/resources/quick-start/retrofit/line/scu5.md)
- [Retrofit an Existing Web Guide — Line Guiding — SCU6x](https://r2r.tech/resources/quick-start/retrofit/line/scu6x.md)
- [Retrofit an Existing Web Guide — Master-Slave Guiding — SCU5](https://r2r.tech/resources/quick-start/retrofit/master-slave/scu5.md)

## Support

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