Opto 22 - Resources & Tools

When inspecting a control engine in PAC Terminal or Debug mode in PAC Control, the Autorun buttons in the Inspect dialog box may be grayed out and not clickable if the controller is running SNAP PAC firmware R10.6b and lower.

PAC Display may not start after reporting MSVCR120.dll error

Knowledge Base - KB91615 - 10/12/2026

When attempting to start PAC Display, you may encounter the following error message, and PAC Display may fail to start: "The code execution cannot proceed because MSVCR120.dll was not found...more

PAC Display Configurator may crash when configuring an alarm point

Knowledge Base - KB91585 - 10/12/2026

After selecting an alarm point in the Graphic Dynamic Attributes dialog box and checking Alarm Point from the Control Engine Driven list, PAC Display Configurator may crash.

PAC Display may incorrectly apply the Comm Failure color to table object graphics

Knowledge Base - KB91566 - 10/12/2026

If any tags on the controller have a Comm Failure quality, PAC Display may incorrectly apply the Comm Failure color to a table object graphic when the Enable graphic color change option is enabled in the Runtime setup.

PAC Display Runtime Pro may crash after sending concurrent alarm emails

Knowledge Base - KB91543 - 10/12/2026

After PAC Display Runtime Professional sends concurrent alarm emails, the Event Log Viewer may show that an email was successfully sent followed by a series of email failure messages.

The “Set I/O Unit Scratch Pad Integer 64 Element” command in an action block may cause error -95 in PAC Control

Knowledge Base - KB91609 - 10/12/2026

When running a strategy that has the “Set I/O Unit Scratch Pad Integer 64 Element” command in an action block, you may see error -95 (“Data stack is not empty”) in the PAC Control message queue.

A renamed subroutine parameter not updated in OptoScript blocks

Knowledge Base - KB90030 - 10/12/2026

In a subroutine, if a user renames a subroutine passed parameter, then the name will not automatically update in OptoScript blocks in the subroutine.

PAC Project Software - MSI for Command Line Installation

Downloads - 10/12/2026

Use this .msi (Microsoft® Installer) installation file to install PAC Project software from the command line in Microsoft Windows®. A command line installation of PAC Project in silent mode...more

SoftPAC Software-based Programmable Automation Controller

Downloads - 10/12/2026

SoftPAC™ is a software-based programmable automation controller (PAC) designed for PC-based control. Programmed just like an Opto 22 hardware PAC, SoftPAC runs your PAC Control strategy...more

OptoOPCServer

Downloads - 10/12/2026

OptoOPCServer is a fast and efficient OPC 2.0-compliant server for exchanging data with Opto 22 groov EPIC and SNAP PAC systems running PAC Control strategies, or with SNAP Ethernet-based I/O...more

OptoDataLink

Downloads - 10/12/2026

OptoDataLink, part of the PAC Project Professional Software Suite, provides data exchange between groov EPIC processors or the SNAP PAC system and popular databases such as Microsoft® SQL...more

PAC Control Professional

Downloads - 10/12/2026

PAC Control, part of the PAC Project Software Suite, is an intuitive, flowchart-based tool for programming industrial automation, process control, building automation, remote monitoring, data...morePAC Control, part of the PAC Project Software Suite, is an intuitive, flowchart-based tool for programming industrial automation, process control, building automation, remote monitoring, data acquisition, and Industrial Internet of Things (IIoT) applications. Using PAC Control, you create and debug control programs and then download and run them on a groov EPIC edge programmable industrial controller or on a SNAP PAC industrial controller. In addition to industrial control, groov EPIC, SNAP PAC R-series, and SNAP PAC S-series controllers are developer and IIoT ready with a built-in HTTP/HTTPS server and a RESTful API. This product includes software and documentation in Adobe Acrobat PDF format as a download. The download file includes other PAC Project software in addition to PAC Control. You can purchase PAC Control Professional as an individual application or as part of the PAC Project Professional Software Suite, which also includes software for HMI development, OPC communication, and database connectivity. Upgrade Information To find out if you can upgrade to this version for free, see the Opto 22 Software Upgrade Policy. If you are using older (not groov EPIC, groov RIO, or SNAP PAC) controllers or brains with PAC Project, see the SNAP PAC System Migration Technical Note (form 1688) for important information. Installation Information All PAC Project software, both Basic and Professional, is in one single download. You can install the Basic version right away to get started. To install PAC Control Professional, first purchase the software and contact Opto 22 to confirm your purchase and receive your password. Click for more about purchasing software and getting a password. When you have your password, download and run the installer file. Choose PAC Project Professional and enter your password for PAC Control Professional. The following applications are installed by default. If you do not want them all, uncheck the ones you do not want when prompted during the installation process. PAC Control Professional (password required) PAC Display Basic PAC Manager (used only with SNAP PAC controllers and I/O units) Tools (PAC Utilities) EtherNet/IP Configurator <less

PAC Control Basic

Downloads - 10/12/2026

PAC Control, part of the PAC Project Software Suite, is an intuitive, flowchart-based tool for programming industrial automation, process control, building automation, remote monitoring, data...more

PAC Display Professional

Downloads - 10/12/2026

PAC Display Professional, part of the PAC Project Professional Software Suite, is a user-friendly HMI package for building operator interface applications to communicate with groov EPIC systems, SNAP...more

PAC Display Basic

Downloads - 10/12/2026

PAC Display Basic, part of the PAC Project Software Suite, is a user-friendly HMI package for building operator interface applications to communicate with groov EPIC systems, groov RIO edge I/O modules...more

PAC Project Professional

Downloads - 10/12/2026

The PAC Project Software Suite from Opto 22 provides all the software you need for industrial automation, process control, building automation, remote monitoring, data acquisition, and Industrial...moreThe PAC Project Software Suite from Opto 22 provides all the software you need for industrial automation, process control, building automation, remote monitoring, data acquisition, and Industrial Internet of Things (IIoT) applications in any field. PAC Project software is fully integrated with groov EPIC processors, groov RIO edge I/O modules, SNAP PAC controllers and brains, and groov and SNAP I/O. See current release details in the PAC Project Readme (Release Notes). PAC Project Professional includes the following: PAC Control Professional for developing control programs to run on groov EPIC processors and SNAP PAC controllers. groov EPIC, SNAP PAC R-series, and SNAP PAC S-series controllers are developer and IIoT ready with a built-in HTTP/HTTPS server and a RESTful API. PAC Display Professional for creating HMIs for operators and technicians PAC Manager for SNAP PAC configuration and maintenance OptoOPCServer for communication with OPC 2.0 clients OptoDataLink for sharing SNAP PAC system data with databases SoftPAC for running control programs on a software-based programmable automation controller (PAC) designed for PC-based control This is a software product that includes complete documentation in Adobe Acrobat PDF format. About Controller Redundancy PAC Project Professional includes support for controller-level redundancy when used with identical SNAP PAC S-series controllers and the SNAP PAC Redundancy Option Kit (part number SNAP-PAC-ROK). To use controller redundancy, controller firmware R9.1b or higher is required. NOTE: Support for controller redundancy has been restricted to SNAP PAC S-series controllers running firmware version R10.4e or lower using PAC Project versions R9.0 to R10.6. In PAC Project R10.6 and higher, you are no longer able to create new strategies containing controller redundancy. You can continue to maintain existing strategies that have controller redundancy; however, those controllers must use firmware version R10.4e or lower. Upgrade Information To find out if you can upgrade to this version for free, see the Opto 22 Software Upgrade Policy. If you are using older (not groov EPIC, groov RIO, or SNAP PAC) controllers or brains with PAC Project, see the SNAP PAC System Migration Technical Note (form 1688) for important information. Installation Information All PAC Project software, both Basic and Professional, is in one single download. You can install the Basic version right away to get started. To install PAC Project Professional, first purchase the software, and then contact Opto 22 to confirm your purchase and receive your password. Click for more about purchasing software and getting a password. When you have your password, download and run the installer file. Choose PAC Project Professional and enter your password. The following applications are installed by default. If you do not want them all, uncheck the ones you do not want when prompted during the installation process. PAC Control Professional PAC Display Professional OptoOPCServer OptoDataLink SoftPAC PAC Manager Tools (PAC Utilities) EtherNet/IP Configurator <less

PAC Project Basic

Downloads - 10/12/2026

The PAC Project Software Suite from Opto 22 provides all the software you need for industrial automation, process control, building automation, remote monitoring, data acquisition, and Industrial...more

PAC Project Demo

Downloads - 10/12/2026

PAC Project Demo contains everything you need to demonstrate or experiment with Opto 22's PAC Project Software Suite: PAC Control development software and a pre-made control strategy...more

SNAP PAC Sim Control Engine Simulator

Downloads, Demo - 10/12/2026

SNAP PAC Sim is Microsoft Windows-based software that simulates the control engine of an Opto 22 programmable automation controller (PAC). You can use SNAP PAC Sim with Opto 22 PAC Project...more

PAC Project Release Notes

Documents - rm_pac_proj - 10/12/2026

This is the latest Release Notes (formerly called Readme) for PAC Project Basic and Professional. It includes information about new features, enhancements, and bug fixes for each PAC Project...more

SNAP D Series Racks (with Terminal Strip) Data Sheet

Documents - 0778 - 10/9/2026

The SNAP I/O D Series racks are designed for discrete control applications and can accommodate 4, 6, 8, or 12 SNAP 4-channel digital modules. These MC and MC-P model racks provide a screw-type terminal...more

Case Study: From Single-Site to Production-Ready Water Treatment

Documents, Case Studies - 2462 - 10/8/2026

View the HTML page Groundwater and surface water carry high concentrations of boron in California's Central Valley. For the local farmers and growers, elevated boron levels can cause reduced...more

groov EPIC & groov RIO System Product Guide

Documents - 2250 - 10/7/2026

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...more

Legacy Edition, PAC Control Commands Quick Reference

Documents - 1713 - 10/6/2026

This document is the Legacy Edition of the PAC Control Commands Quick Reference. It lists all PAC Control commands used with both SNAP PAC hardware and legacy hardware. Use this reference card if...more