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A Smart PLC Alternative: OPTA Series – (PLRs) Programmable Logic Relays

Sept 29, 2025 - Mac's II Agencies OPTA vs PLCs Why Finder’s Programmable Logic Relay Is the Right-Sized Solution 5

September 29, 2025

OPTA vs PLCs: Why Finder’s Programmable Logic Relay (PLR) Is the Right-Sized Solution

By: Brandon Armstrong, Industrial Sales Manager, Mac’s II Agencies

If you’ve ever been stuck choosing between a simple relay and a full-blown PLC, you know the frustration. Relays feel too limited. PLCs? Too expensive, too complex, and loaded with features you’ll never use. What you really need is something in between.

That’s exactly where the Finder OPTA Programmable Logic Relay (PLR) shines — the right-sized, cost-smart solution for automation.

Sept 29, 2025 - Mac's II Agencies OPTA vs PLCs Why Finder’s Programmable Logic Relay Is the Right-Sized Solution PLR
Meet OPTA: The Micro PLC Designed for Smarter, Simpler Automation.

Why Traditional PLCs Can Be Overkill

PLCs are powerful tools, but for many projects, they’re simply more than you need:

  • Pricey hardware and software that can strain budgets.
  • Licensed programming environments that take time (and training) to master.
  • An overload of unused features, leaving you paying for functions your project doesn’t require.

For applications that don’t demand a rocket launcher, Finder’s OPTA provides the balance: enough intelligence to handle modern automation, without the excess baggage.

Who’s Behind OPTA: Finder’s Legacy of Innovation

Finder has been designing relays and control solutions since 1954. Their Italian-made products are known worldwide for reliability and innovation. By teaming up with Arduino Pro, Finder combined decades of industrial expertise with the flexibility of open-source programming. The result? A device that feels approachable for makers and efficient for professionals, all while carrying CE and cULus certifications for industrial-grade applications.

Sept 29, 2025 - Mac's II Agencies OPTA vs PLCs Why Finder’s Programmable Logic Relay Is the Right-Sized Solution PLR
Program Without Limits: OPTA Runs on the Open, License-Free Arduino IDE

A High-Level Overview: OPTA at a Glance

ModelConnectivityBest For
OPTA LITEEthernet (RJ-45), USB-CSimple Ethernet control and programming
OPTA PLUSEthernet, USB-C, RS-485 (Modbus RTU)Serial integration
OPTA ADVANCEDEthernet, USB-C, RS-485, Wi-Fi/BLEWireless IoT and Industry 4.0 applications

All three share the same foundation: 12-24 V DC supply, 8 digital/analog inputs, 4 relay outputs (10A), USB-C for programming/data logging, and RJ-45 for Ethernet/Modbus TCP/IP.

Expandable by Design

Need more I/O? OPTA supports up to five expansion modules, scaling to:

  • 80 digital inputs
  • 30 analog inputs
  • 40 digital outputs
  • 30 analog outputs

This flexibility means OPTA can start small and grow with your project.

  • Sept 29, 2025 - Mac's II Agencies OPTA vs PLCs Why Finder’s Programmable Logic Relay Is the Right-Sized Solution 5
  • Sept 29, 2025 - Mac's II Agencies OPTA vs PLCs Why Finder’s Programmable Logic Relay Is the Right-Sized Solution 5

OPTA: Smart Automation Without the Bloat

So, what makes OPTA stand out? It’s all about balance. You get:

  • Flexible Programming: Use familiar IEC 61131-3 languages like Ladder or FBD, or dive into Arduino IDE for open-source freedom.
  • Scalable Models: From the Ethernet-ready Lite, to the RS‑485/Modbus-ready Plus, to the wireless-enabled Advanced.
  • Right-Sized Performance: With 8 inputs and 4 relay outputs (10A), it’s ready for most automation needs without being oversized.
  • Expansion on Demand: Add more inputs and outputs as your project grows, up to 80 digital or 30 analog inputs.

In short: smart control that doesn’t make you overthink.

Sept 29, 2025 - Mac's II Agencies OPTA vs PLCs Why Finder’s Programmable Logic Relay Is the Right-Sized Solution 3 PLR
From Concept to Factory Floor, OPTA Scales with Your Automation Needs.

Real-World Impact: Who OPTA Works For

Whether you’re an OEM, an industrial automation engineer, or a building automation designer, OPTA helps you stay agile:

  • Manufacturing & logistics: Simplify machine control, log data securely, and connect to Industry 4.0 systems without breaking the bank.
  • Building management: Optimize energy use, automate security lighting, or improve HVAC efficiency with minimal setup.
  • Smart infrastructure: Airports, malls, parking facilities, the OPTA makes it easier to scale automation in dynamic environments.

Finder OPTA: Right-Sized Automation

Full PLCs will always have their place. But if your project doesn’t need all the extras, why overcomplicate it? The Finder OPTA PLR is automation without the overkill, designed to give you just enough control, with the flexibility to grow.

Curious Whether OPTA Is the Right Fit for Your Next Project?

Mac’s II Agencies’ team can help you compare models, understand the options, and find the smart choice for your automation goals.

Connect with Mac’s II Agencies today and make automation simple, effective, and cost-smart.

Sept 29, 2025 - Mac's II Agencies OPTA vs PLCs Why Finder’s Programmable Logic Relay Is the Right-Sized Solution 3

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