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$995.00 (USA and Canada only)

Availability: In stock
groov RIO edge EMU; 3-phase power and energy monitoring, 18 data & accumulation values per phase; 10 summation values

Production Specification

The GRV-R7-I1VAPM-3 is a groov RIO energy monitoring unit (EMU) designed as an intelligent, distributed power and energy monitoring module. With built-in web-based configuration, commissioning, flow logic software, and the ability to run control programs written in IEC 61131-3 compliant languages, the groov RIO EMU also offers support for multiple OT and IT protocols. All these capabilities give the groov RIO EMU the flexibility to fit into IIoT projects (especially those that require energy data acquisition or communications) or traditional energy management control systems, or to act as a stand-alone energy management control unit.. Learn more about monitoring power and energy with groov products.

The groov RIO EMU simultaneously measures volts AC RMS and amps AC RMS on Category III wye (up to 400 VAC) or delta (up to 600 VAC) circuits. It can monitor three-phase AC current using 0.333 V, 1 V, or 5 A current transformers (CT). (Opto 22 offers a range of split-core current transformers suitable for the groov RIO EMU.) Each phase can be configured to ignore signals below a specified threshold in power measurement and energy accumulation to help you tune signal accuracy.

From the two measured field inputs, the module automatically calculates a total of 64 data values, including voltage and current; true, reactive and apparent power; power factor, frequency, net energy, and other values, as well as accumulated energy values for all phases. 

You can use groov RIO EMUs in several ways:

  • As an edge energy monitoring unit, communicating data between loads and data destinations. You can:
    • Push data directly to on-premises or cloud apps, databases, or other software, typically using the included Node-RED
    • Publish data to an MQTT broker
    • Respond to Modbus/TCP requests for data
    • Configure with browser-based groov Manage software
    • Manage local user accounts and permissions, or from a central location through an LDAP server
  • As a traditional energy monitoring unit (on its own or as part of a larger system), configuring channels through your control program:
    • With a groov EPIC processor running a PAC Control strategy; add a groov RIO EMU as an I/O unit
    • With CODESYS applications:
      • As part of a larger energy monitoring system: download and install the Opto 22 CODESYS Library Package to the CODESYS Development System, then add a groov RIO EMU as an Ethernet device.
      • As a stand-alone energy monitoring and control unit: enable the on-board CODESYS runtime engine (requires purchase of GROOV-LIC-CRE-RIO), download and install the Opto 22 Library Package for CODESYS, build your control program, and run it on the groov RIO EMU.
    • With a custom control program through either groov RIO's OptoMMP memory map, its REST API, or through secure shell access (requires free GROOV-LIC-SHELL license)

The GRV-R7-I1VAPM-3 has a communications processor with two switched Gigabit Ethernet interfaces, one capable of Power over Ethernet (802.3af PoE Class 0) connections, supplying power to the groov RIO. It also has:

  • Supply terminals to connect to a 10-32 V DC power supply.
  • A USB host port, which can be used to connect additional devices like a Wi-Fi adapter, a USB memory stick, or a USB-to-serial adapter (none included).
  • Status LEDs to display the status of power, network, and electrical activity.
  • One 13-pin removable field I/O termination connector with spring clamp wire retention.
Specification GRV-R7-I1VAPM-3
Maximum UL61010-3 Measurement Category Category III 600 VAC
Delta Voltage Input Ranges, Vrms 600, 520, 260 (Line-to-Line)
Wye Voltage Input Ranges, Vrms 400, 300, 150 (Line-to-Neutral)
Voltage Accuracy
(% of range @ 50—60 Hz, excluding Voltage transformer)
Wye: ±0.35%, Delta: ±0.5%
Current Transformer (CT) Outputs Supported 5.0 A, 1.0 VAC or 0.3333 VAC
Current Accuracy
(% of CT range @ 50—60 Hz, excluding Current transformer)
Power Accuracy
(% of (Vrms range) * (CT current rating), @ 50-60Hz)
Data Refresh Time 1 s
Step Response Time 1 s
Problem Indication Vrms out of range, Irms out of range
Number of Data Channels 64
Ethernet Two switched Gigabit ports; daisy-chainable; ETH1 with 802.3af PoE powered device (PD)
USB One Port, USB 2.0 HS
Memory 1 GB RAM, 4.0 GB user space
Power Supply 802.3af PoE Class 0 or 10—32 V DC (but not both)
Power Consumption 4.5 W
Isolation (field to Ethernet / power input) 3600 VAC working, 5400 VAC transient
Isolation (channel-to-channel) N/A
Minimum GRV-R7 Firmware Version 3.3.0
Minimum groov EPIC Firmware Version 3.3.0
Minimum PAC Project Version 10.4000
Minimum Library Package for CODESYS Version
Field Connector Wire Size 28—14 AWG
Torque, field connector screw 2.5 in-lb (0.28 N-m)
Power Connector Wire Size 22—14 AWG
Torque, DC power connector screws 7.0 in-lb (0.79 N-m)
Torque, panel mount tab screw 2.0 in-lb (0.23 N-m)
Temperature (operating) -20 °C to +70 °C
Temperature (storage) -40 °C to +85 °C
Relative Humidity (non-condensing) 5—95%
MTBF (minimum, 25 °C) 1.2 Mhrs
Agency Approvals UL/cUL(Class 1 Div. 2); CE, ATEX(Category 3, Zone 2), RoHS; DFARS; CB Scheme; UKCA
Warranty 30 months

groov RIO EMU User's Guide

This user's guide shows you how to assemble, initialize, configure, commission, and maintain a groov RIO  EMU, part number GRV-R7-I1VAPM-3. groov RIO EMUs can monitor the electrical energy used in your facility and then deliver that data to online software applications, control systems, and business systems—using your existing wired or wireless Ethernet network. groov RIO EMUs give you the detailed, real-time data you need to analyze energy consumption and reduce energy costs.

The guide explains how to:

  • Mount and wire a groov RIO EMU
  • Complete the first configuration steps after you turn it on (initialize)
  • Navigate groov Manage
  • Set up cybersecurity features
  • Connect it to a network or multiple networks
  • Configure groov RIO EMU to correctly measure your electrical load(s)
  • Enable MQTT 
  • Maintain your groov RIO EMU by applying firmware updates, performing periodic backups and basic troubleshooting including how to conduct an OptoRSS (Remote Support Service) session

groov RIO Energy Monitoring Unit Data Sheet

This data sheet describes Opto 22's groov RIO® Energy Monitoring Unit (EMU), an edge energy monitoring module for industrial internet of things (IIoT) and automation applications. With a single part number (GRV-R7-I1VAPM-3), you can monitor AC voltage, current, power, and energy usage on wye or delta circuits up to UL 61010-3 measurement category III; power over Ethernet; and mounting without the need for a rack or chassis—in a compact industrial package. It can monitor three-phase AC current using 0.333 V, 1 V, or 5 A current transformers (CT). The module includes built-in processing and communication through web-based configuration, flow logic software, efficient data communication methods, centralized user management, and support for multiple operations technology (OT) and information technology (IT) protocols to simplify any IIoT or automation application.

groov Products Comparison Chart

This two-page chart compares features of the following groov products:

groov EPIC System Product Guide

This document lists all the Opto 22 groov EPIC® System part numbers, including groov EPIC processors, power supplies, and chassis; groov I/O modules; and groov RIO® edge I/O modules. It also describes the main features of groov EPIC and groov RIO.

PC-Based I/O Overview

This document shows examples of system architecture for PC-based I/O control systems and lists Opto 22 products that work together for PC-based control. System examples include:

  • Ethernet systems using SoftPAC, a software-based programmable automation controller programmed with PAC Control
  • Ethernet systems using the OptoMMP protocol
  • Direct control of I/O using no I/O processor (no brain)
  • High-speed control using the Pamux protocol
NOTE: Before choosing to use a PC for control, consider groov EPIC.  A groov EPIC processor offers many features similar to a PC, such as a Linux OS with optional secure shell access; cybersecurity features; Ethernet, USB, and HDMI ports; and the ability to run the control program and HMI on the same hardware. In addition, a groov EPIC system offers real-time control using traditional programming languages; guaranteed-for-life I/O on the same chassis; industrial toughness for hazardous locations; and easier integration with company computer networks, manufacturing, business, and facility systems, and cloud-based services & software.

groov RIO Firmware Release Notes

Release notes for the latest update to groov RIO® edge I/O modules, including part numbers GRV-R7-MM1001-10GRV-R7-MM2001-10 and GRV-R7-I1VAPM-3. Includes information on new features, enhancements, and bug fixes; groov Manage, groov View, Node-RED, and Ignition Edge® (GRV-R7-MM2001-10 only).

Note: This document was formerly called a readme. The name was changed to more accurately describe its content.

To get the latest firmware, go to each product's respective firmware download page (click on the product link, then click the Download tab). Follow instructions in the following documents to install the firmware:

Getting Started with MQTT in groov Products

Opto 22’s groov EPIC® edge programmable industrial controller and groov RIO® edge I/O give you many ways to use MQTT data communications—via groov Manage, Node-RED, or Ignition Edge from Inductive Automation®. This guide helps you understand which approach is best for you and helps you get started fast.

Guide to Networking groov Products

This guide helps you understand the basics of networking over wired Ethernet networks and wireless LANs. It also provides guidelines for setting up communications between your Opto 22 groov products and your systems and equipment. groov products include:

The goal is for you to be able to securely monitor, control, and move data between your automation equipment and computer networks, including the internet.

The guide includes information on IP addresses, gateway routers, MQTT, VPNs and port forwarding, additional resources, and networking terms.

OptoMMP Protocol Guide

This guide is for programmers who are writing custom applications to communicate with Opto 22 memory-mapped devices. These devices include groov EPIC processors; groov RIO modules; SNAP PAC controllers and SNAP PAC EB and SB brains; G4EB2 brains; SNAP Ultimate, SNAP Ethernet, and SNAP Simple I/O; E1 and E2 brain boards, and SNAP-LCE controllers.

The guide describes how to use the IEEE 1394-based OptoMMP memory-mapped protocol for programming. The guide also contains the complete memory map for all Opto 22 memory-mapped devices.

NOTE: This guide replaced previous individual programming guides for SNAP Ultimate I/O (form #1312) and SNAP Ethernet I/O (form #1227). This document was formerly called the "SNAP Ethernet-Based I/O Units Protocols and Programming Guide."

groov RIO EMU Brochure

This brochure highlights some of the features of Opto 22's groov RIO Energy Monitoring Unit (EMU) (part number GRV-R7-I1VPAM-3). It lists a variety of use cases, summarizes how to include it in different application environments, describes the range of data collected and calculated, and it includes the wiring diagram.

If you want more in-depth information, see the groov RIO EMU Data Sheet (form 2352).

Press Release: Opto 22’s groov EPIC and groov RIO version 3.4 features more OPC UA server and MQTT options

The latest firmware updates for groov EPIC and groov RIO offer new data services capabilities plus updated software for security.

Press Release: Opto 22 releases groov RIO EMU distributed energy monitoring unit

GRV-R7-I1VAPM-3 offers three-phase industrial AC monitoring in a standalone edge I/O module.

Using IEEE Floats in Opto 22 Products

While computers, CPUs, and electronic devices store numbers in binary format, most often they represent real numbers as floating point numbers, or floats. For example, in industrial automation applications, all analog values read from an I/O unit are floats.

This document describes how the IEEE 754 standard for floats is used in Opto 22 products, including groov RIO, groov EPIC, and SNAP PAC systems.

Configuring Email Applications for Opto 22 Products

You can use many Opto 22 products to send email notifications to keep engineers and technicians aware of
important conditions in your system. For example:

  • You can send email through a PAC Control strategy running on a groov EPIC or SNAP PAC controller.
  • Your groov View HMI can send event notifications via email.
  • Your Node-RED flow on groov RIO or groov EPIC can send email.
IMPORTANT: Due to security changes, you will stop receiving emails from your Opto 22 devices unless you
configure your email account with a new application-specific password. This technical note gives you details and steps to configure your account.

UKCA Declaration of Conformity (groov EPIC and groov RIO)

This document is the Manufacturer's Declaration of Conformity for the products listed herein, in accordance with the rules, regulations and standards of the United Kingdom. The models cited have been tested to the essential requirements listed in the Standards section, and fully comply with the legislation as listed in UK Legislation section.

White Paper: Building Industrial IoT from Edge to Cloud

Sharing process data has long been a goal of industrial automation, but traditional operational technology (OT) architectures are poor at scaling, priced prohibitively, and demand complex configuration and support. So how can we achieve the new, more ambitious goals of the industrial internet of things (IIoT)?

Read this white paper to see how next-generation distributed I/O and control are opening new possibilities for connected infrastructure.

White Paper: I/O for the IIoT

In an era of increasing connectivity and technical capabilities, it seems like simple ideas should be simple to achieve. But industrial internet of things projects, even simple ones, are still expensive, demand special skills, and involve many steps. 

This white paper introduces edge I/O, a new kind of product that simplifies IIoT applications. Opto 22's groov RIO is an example of an edge I/O product. 

ATEX Letter of Conformity for groov EPIC

This ATEX Letter of Conformity is provided to support CE Declaration of Conformity (groov EPIC and groov RIO), form 2261.

groov Products Cybersecurity Design and Best Practices Technical Note

Versión en Español

When you’re gathering, processing, and sharing operational data from industrial equipment on premises or located remotely, cybersecurity is a big worry. Opto 22’s groov EPIC® system can help you build a secure system.

This technical note describes the cybersecurity features built into groov RIO and groov EPIC and lists best practices for setting up a secure system. Using these features can help you comply with security guidelines as outlined in the ISA/IEC 62443 specification.

The tech note also includes system architecture diagrams showing how field devices, legacy PLCs, SCADA systems, MQTT communications, and software and services can work together with groov products to meet your automation and IIoT needs.

Declaration of Conformity (groov EPIC and groov RIO)

This document is the Manufacturer's Declaration of Conformity for the products listed herein, in accordance with European, international, and/or national standards and regulations.

Communication Tools & Protocols for Opto 22 Products Technical Note

This technical note describes the networking tools and protocols that are compatible with Opto 22 products for communication with a wide variety of software and systems.

Simplified IP Addressing

This technical note introduces you to IP addressing on an Ethernet network.

GRV-R7-I1VAPM-3 Firmware

This download contains current firmware for GRV-R7-I1VAPM-3. For a list of bug fixes and enhancements included in this firmware, see the groov RIO Firmware Release Notes.

CAD Drawing: groov RIO

This ZIP file includes drawings in various file formats for groov RIO part numbers: GRV-R7-MM1001-10GRV-R7-MM2001-10 and GRV-R7-I1VAPM-3.

CAD Drawings: groov EPIC and groov RIO I/O wiring

This ZIP file contains I/O wiring diagrams for groov EPIC I/O modules and groov RIO models, in DWG format.

groov Find

groov Find is an optional utility program you can use on a Microsoft Windows computer to locate groov RIO units, groov EPIC processors, and groov Boxes on your network. Using groov Find, you can see these products' IP addresses and access them through a web browser.

NOTE: If you are using a Mac, groov Find is available for free in the App Store.

If you can't access your groov RIO, groov EPIC, or groov Box with a web browser, your network may not provide DHCP and DNS services. groov Find can help you locate your groov product, connect to it, and assign it a fixed IP address if necessary.

For more information, see the groov RIO User's Guide (form 2324), the groov EPIC User's Guide (form 2267), or the groov View User's Guide (form 2027).

Security Certificates

Current security certificates are embedded in the firmware for Opto 22 products. If you are using recent firmware or can update your device to current firmware, you do not need any of these certificates. If you cannot update firmware, then you can apply a certificate from this zip file as needed.

Before you download, read the Legal Agreement.

This zip file contains the following certificates:

  • DigiCert High Assurance EV Root CA (DigiCert.der) - Valid from 11/9/2006 to 11/9/2031
  • GeoTrust Primary Certification Authority (GeoTrustPCS.crt) - Valid from 11/26/2006 to 7/16/2036
  • GlobalSign Root CA (GSR1.crt) - Valid from 9/1/1998 to 1/28/2028
  • GTS Root R1 (gtsr1.der) - Valid from 6/21/2016 to 6/21/2036
  • GTS Root R2 (gtsr2.der) - Valid from 6/21/2016 to 6/21/2036
Certificate installation instructions are located here: Background information

A valid security certificate may be required by mail servers to allow you to send emails from your Opto 22 products, for example, through: 
  • a PAC Control strategy running on a groov EPIC or SNAP PAC controller
  • a groov View HMI sending event notifications
  • a Node-RED flow on groov RIO or groov EPIC
Valid security certificates may also be required by other services you may be using via software on your Opto 22 device (for example, using Node-RED to move data in and out of Google Sheets).

All providers of email or other services update their security certificates from time to time. When that happens, your email or other service will stop working until you either install a new certificate or update firmware that contains the new certificate. Make sure you set up error handling procedures or other ways to verify that services are working. 

Opto 22 updates certificates as soon as we know about new ones. If you see a security error (for example, -2104 in PAC Control) or have some other indication of a certificate issue, be sure to check for new firmware or download this zip file. If you need help, contact Opto 22 Product Support.

Video: Introducing groov RIO EMU (Energy Monitoring Unit)

Meet groov RIO EMU (Energy Monitoring Unit) — I/O for the IIoT. The RIO EMU has the exact same physical form factor as others in the RIO family, like the MM1 and MM2. Watch a quick product overview and discover all the RIO possibilities.

Webinar: Introducing groov RIO

Join Benson Hougland for a live presentation and demonstration of Opto 22's new groov RIO — I/O for the IIoT.

Video: IntegrateLive! Workshop - Power Monitoring

Discover how tracking power consumption isn't just about being green; it's a strategic move to slash peak demand electricity charges significantly. By identifying when and where energy use spikes, you can implement strategies to smooth out consumption, potentially saving substantial amounts on your utility bills.