Build your system in the SNAP I/O Configurator.

Now developer and IoT ready with a built-in HTTP/HTTPS server and RESTful API. See Programming and Protocols, below.

** Compatible with groov EPIC. You can control SNAP PAC R-series I/O units with groov EPIC or control groov EPIC I/O units with a SNAP PAC R-series controller running PAC Control R10.a or higher. **

The SNAP-PAC-R2-FM programmable automation controller provides control, communication, and I/O processing in a compact, rack-mounted package. One of four components of the SNAP PAC System, the SNAP-PAC-R2-FM is fully integrated with PAC Project software, SNAP PAC brains, and SNAP I/O modules.

NOTE: The SNAP-PAC-R2-FM is Factory Mutual approved. If you don't need FM approval, see the SNAP-PAC-R2 instead.

Used with the included PAC Project Basic software suite (or PAC Project Professional, purchased separately), the Ethernet-based SNAP-PAC-R2 can handle almost all your industrial control, remote monitoring, and data acquisition needs.

System Architecture
This intelligent, flexible PAC can be used in several ways. The SNAP-PAC-R2 can provide complete cell control on its own rack with I/O modules. It can also control SNAP PAC and groov EPIC I/O units at the same time for a larger system. Or the R1 can be used in a more extensive distributed control system as an I/O unit controlled by a groov EPIC processor or a SNAP PAC S-series controller. It can even be used as intelligent remote I/O for Allen-Bradley Logix PLC systems, such as ControlLogix and MicroLogix.

Networking
Two independent, 10/100 Mbps Ethernet network interfaces are included on each SNAP-PAC-R2. These interfaces have separate IP addresses and can be used to segment the control network from the company network or to provide Ethernet link redundancy in case of link failure or maintenance. In addition, the controller has an RS-232 serial port with hardware handshaking, which can be used for PPP (Point-to-Point Protocol) communication over a modem or for direct connection to serial devices.

Programming and Protocols
The SNAP-PAC-R2 is programmed using the included PAC Control software. PAC Control is a flowchart-based tool for developing control applications, or strategies . You create and debug the strategy on your computer and then download it to the R2, where it runs independently. The controller has 16 MB of RAM and can run up to 16 PAC Control flowcharts at once (many more can be included in the strategy).

REST API: All I/O point and strategy variable data is available for secure access using the built-in HTTPS server and RESTful API, with data delivered in JSON format. For complete API documentation and steps for getting started,see developer.opto22.com. In addition, two Node-RED nodes are available. Note that minimum firmware R9.5a and PAC Project R9.5a are required to use the REST API.

You can build full-featured operator interfaces (HMIs) using the included PAC Display software, which taps the same tagname database you've already developed in PAC Control. SNAP PAC R-series controllers are also compatible with Opto 22's groov products and groov View HMI tool.

In addition to control, the SNAP-PAC-R2 provides communication. Because it is based on the Internet Protocol (IP), the SNAP-PAC-R2 can communicate simultaneously using several different protocols, including TCP/IP, EtherNet/IP, PPP, Modbus/TCP, SNMP for network management, SMTP for emailing, and OptoMMP, the open memory-mapped protocol used by all Opto 22 Ethernet-based devices.

I/O Processing
The controller mounts on a SNAP PAC mounting rack with up to 4, 8, 12, or 16 digital, analog, serial, and special-purpose I/O modules. Choose the modules needed for your application from the extensive line of SNAP I/O modules.

• Analog features include thermocouple linearization, minimum/maximum values, offset and gain calibration, scaling, TPO (time-proportional output), output clamping, filter weight, ramping, totalizing, and watchdog timer. The SNAP-PAC-R2 also offers up to 96 PID loops.
• Digital features are simplified on the SNAP-PAC-R2. Digital features include status, latching, watchdog timer, TPO, totalizing, and pulse generation.

For high-speed digital features, see the SNAP-PAC-R1.

To compare product features, see the Compare SNAP PAC controllers and brains.

Build your system in the SNAP I/O Configurator.