Introducing the E8v3 Module: a compact, industrial-grade RS485 Modbus relay module built for reliable and scalable control in tight spaces. Powered by an ARM CPU, this 8-channel controller features pluggable OMRON® relays, extendable manual override buttons (up to 500 meters), and flexible 12/24V control logic. Designed as a dependable slave device for PLCs, building automation systems, or any Modbus master, the E8v3 delivers robust 16A switching capacity in a space-saving DIN-rail package. Whether for distributed control networks or as a standalone relay bank, the E8v3 brings industrial reliability to your automation projects.

Why You'll Love This Controller

✔ Industrial Modbus Slave for Seamless Integration
Designed as the perfect team player in any automation network. Standard Modbus RTU protocol ensures easy integration with PLCs, SCADA systems, building management controllers, and even home automation platforms like Home Assistant (via ESPHome Modbus controller).

✔ True Redundancy with Extendable Manual Override
A standout feature for critical applications. Place physical control buttons up to 500 meters away for a genuine automation bypass—essential loads can be manually operated even if the entire control network or master controller fails.

✔ Ultimate Flexibility in Control Logic
Three ways to command your relays—Modbus for centralized automation, direct HIGH/LOW level signals for simple hardwired control, or manual buttons for local override. The E8v3 adapts to your system architecture, not the other way around.

✔ Built for Harsh Industrial Environments
With a -40°C to +55°C operating range, OMRON® relays rated for millions of operations, and robust construction, this module delivers decades of reliable service in demanding settings like factories, greenhouses, or outdoor installations.

✔ Maintenance-Friendly Pluggable Relays
When a relay eventually reaches end-of-life after years of service, replace it in seconds—no soldering, no board replacement, no extended downtime. Your system stays operational while maintenance is performed.

✔ Simple Hardware Configuration
The intuitive DIP switch system makes Modbus addressing quick and error-free. Set your address, enable communication, and you're online—no complex software setup or programming required.

✔ Space-Saving Design
At just 170mm wide, the E8v3 delivers full industrial functionality in a compact package, making it ideal for retrofit projects or installations where cabinet space is at a premium.

Among other outstanding features are the following:

• Extendable Manual Override Buttons: 8 onboard buttons can be extended via cable up to 500 meters, enabling centralized physical control from anywhere in your facility—a true automation bypass feature for ultimate system redundancy.

• Pluggable OMRON® Relays: High-quality 16A SPDT relays (COM/NO/NC contacts) can be individually replaced without soldering, drastically reducing downtime and simplifying long-term maintenance.

• Flexible Triple-Mode Control: Operate via RS485 Modbus commands for centralized automation, direct HIGH/LOW level signals (12/24V) for hardwired simplicity, or manual buttons for local override—choose the method that best suits your application.

• Industrial-Grade Durability: Engineered for harsh environments with an extended operating temperature range of -40~55°C and relay ratings of 5 million+ mechanical / 100,000+ electrical operations.

• Simple Addressing with DIP Switch: 4-bit DIP switch enables easy hardware configuration of Modbus address (bits 1-3) and RS485 communication control (bit 4)—no software or programming required.

• Compact Footprint: With dimensions of just 170 x 105 x 73 mm, the E8v3 fits easily into crowded electrical cabinets while delivering full-featured functionality.

Technical Specifications: