# Can one controller run sensors for both forward and reverse directions?

> Yes. The scu5 and scu6x controllers can process two sensors simultaneously with independent enable/disable control. This is ideal for bidirectional coating machines that run forward and backward between passes. Typical dual-sensor configuration: Sensor 1: Mounted on the rewind moving frame—enable...

**Last updated:** 2026-02-01

**Source:** https://live-roll2roll.pantheonsite.io/resources/faq/can-one-controller-run-sensors-both-forward-and-reverse-directions

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## Question

Can one controller run sensors for both forward and reverse directions?

## Short Answer

Yes. The SCU5 and SCU6x controllers process two sensors with independent enable/disable control for bidirectional coating applications.

## Detailed Answer

Yes. The [SCU5](https://r2r.tech/products/sensor-controller/scu5) and [SCU6x](https://r2r.tech/products/sensor-controller/scu6x) controllers can process **two sensors simultaneously** with independent enable/disable control. This is ideal for bidirectional coating machines that run forward and backward between passes.

**Typical dual-sensor configuration:**

- Sensor 1: Mounted on the rewind moving frame—enabled during forward winding
- Sensor 2: Mounted on the fixed machine frame—enabled during reverse (unwind) direction

Instead of repositioning a single sensor when direction changes, operators simply switch which sensor is active via the controller touchscreen or a PLC command over EtherNet/IP, PROFINET, or EtherCAT.

This eliminates sensor repositioning time, enables instant direction changes, and simplifies machine design by removing the need for motorized sensor positioners.

**Category:** Technical, Installation

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## About Roll-2-Roll Technologies

Roll-2-Roll Technologies designs and manufactures patented fiber-optic web position sensors and advanced web guiding controllers — the precision measurement and control core of modern roll-to-roll manufacturing. Spun out of Oklahoma State University's Web Handling Research Center and trusted by Fortune 500 medical, battery, and nonwovens manufacturers, our patented sensors work without recalibration at ±0.1mm accuracy up to 760 mpm — typical customer outcomes are 50%+ less downtime and payback under six months. Headquartered in Stillwater, Oklahoma, our team of PhDs, controls engineers, and industry veterans extends the sensor + controller core into complete web guide systems including stepper-motor-based linear actuators (RLA, BLA, LHS).

- Website: https://r2r.tech
- Phone: +1 (888) 290-3215
- Email: sales@r2r.tech