Now you can integrate HART® (Highway Addressable Remote Transducer) smart devices such as field-mounted process transmitters and analyzers with your SNAP PAC System.
Communicate status, diagnostics, configuration, and other information with smart devices using the SNAP-AIMA-iH input module. This module has two isolated channels of 4-20 mA analog input current. The HART protocol categorizes the SNAP-AIMA-iH as a current input connection type, which means that the module is a low impedance device.
See full description and specs for the SNAP-AIMA-iH.
How To Use Them
Mount HART SNAP I/O modules alongside other analog, digital, and serial SNAP I/O modules on a SNAP PAC rack with a SNAP PAC brain or rack-mounted controller for I/O processing and communications. You'll need to supply external loop power supplies for these modules.
Each module includes LED indicators to provide status information, such as HART channel operation, communication errors, or zero loop current or voltage reading.
Most customers use HART SNAP I/O modules with a SNAP PAC programmable automation controller and PAC Control automation software. Several HART-specific commands were added to PAC Control version 9.4 to make communication easier. Sample PAC Control subroutines show you how to use these commands to communicate with HART devices.
Required: SNAP PAC controller or brain firmware R9.4 or higher; PAC Control R9.4 or higher. All HART commands for wired devices including universal, common practice, and device-specific commands are available for these modules in PAC Control.
HART SNAP I/O modules can also be used with other automation systems. If you have a .NET/Mono application, you can integrate the modules into it using the SNAP PAC .NET HART developer toolkit.
NOTE: These modules are designed for use with SNAP PACs and SNAP PAC brains. They're not compatible with legacy brains and controllers.
A Word (or Three) about Isolation
Channel-to-channel isolation. The two channels on each of these modules are isolated from each other. Channel-to-channel isolation gives you complete freedom from ground-loop problems even on grounded devices connected to channels on the same module.
Transformer isolation. All SNAP analog modules provide transformer isolation, which prevents ground loop currents from flowing between field devices and causing noise that produces erroneous readings. Ground loop currents are caused when two grounded field devices share a connection, and the ground potential at each device is different.
Optical isolation. All SNAP I/O modules provide optical isolation that protects sensitive control electronics from industrial field signals: 4,000 volts of transient (4000 V for 1 ms) protection.
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HART is the most widely used digital communications protocol in process automation. Now you can communicate with HART current loop devices and use their data to increase uptime, improve productivity, and enhance safety.
Communicate with smart HART devices using the SNAP-AOA-23-iH output module, with its two isolated channels of 4-20 mA analog output current. The HART protocol categorizes the SNAP-AOA-23-iH as a current output device, which means that each channel controls the loop current and is a high impedance device.
See full description and specs for the SNAP-AOA-23-iH.
Communication with HART Devices
Each isolated channel on HART SNAP I/O modules includes an integrated HART modem, which allows the channel to communicate digitally with a HART FSK (frequency-shift keying) signal superimposed onto the analog 4-20 mA current loop.
As part of a SNAP PAC I/O unit, each channel is a master device that communicates with other HART current loop devices in either point-to-point or multidrop configurations.
For lots more information about the HART protocol, visit www.hartcomm.org.
Lifetime Warranty, Free Product Support
Yes, you read that right.
Like most of our I/O, the SNAP-AIMA-iH and the SNAP-AOA-23-iH are guaranteed for life. And they're factory calibrated and ready to use when they arrive.
And like all our products, they include free product support from our experienced engineers in our Temecula, California headquarters.
About Opto 22
Commercial and industrial businesses, OEMs, and system designers have used Opto 22 products for more than 40 years to monitor, control, and get data from all kinds of machines and devices.
- Our solid-state relays and I/O modules are famous for their reliability. Most are guaranteed for life.
- Opto 22 controllers communicate over standard networks using open protocols.
- Our systems can exchange data with company databases, Allen-Bradley PLC systems, Modbus systems, OPC clients.
- Opto 22 products are manufactured and supported in the U.S.A. Product support is free.
Learn more about Opto 22.