NOTE: Although still fully supported and in production, the SNAP Simple brain is not recommended for new development. We recommend the SNAP-PAC-EB2 brain instead.

Opto 22 SNAP Simple I/O™ is a low-cost solution that offers Ethernet/TCP communications as well as analog, simple digital, and serial capability on the same mounting rack. Used for high-density commercial and industrial applications and for remote monitoring applications with high I/O point counts, a SNAP Simple I/O unit consists of a SNAP-ENET-S64 brain mounted on a SNAP M-series rack with standard SNAP I/O™ analog, digital, and serial modules.

This guide is for programmers who are writing custom applications to communicate with Opto 22 memory-mapped devices. These devices include 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."

This document shows you how to set up communication between Ethernet-based Modbus systems (using Modbus/TCP) and the SNAP PAC System. In addition to the SNAP PAC System (SNAP PAC S-series and R-series controllers and SNAP PAC brains), the guide also covers Modbus/TCP communication with older Opto 22 Ethernet-based devices, including SNAP Ethernet, SNAP Simple, and SNAP Ultimate I/O; and E1 and E2 brain boards.

This README file lists revision changes made to the SNAP Simple I/O firmware used in SNAP Simple I/O brains.

Readme for ioProject Basic and Professional, the legacy versions of PAC Project. Includes information on features, enhancements, and bug fixes for each ioProject application: ioControl, ioDisplay, OptoOPCServer, ioManager, and ioUtilities.

This document describes migration options for customers integrating the SNAP PAC System with older Opto 22 systems. It explains the SNAP PAC System's similarities and differences with earlier systems, defines legacy products, and shows how to mix old and new hardware.

Customers moving to the SNAP PAC System may also want to consult form #1693, Legacy and Current Product Comparison and Compatibility Charts.