Analog IO modules with HART communications

Opto 22's SNAP-AIMA-iH and SNAP-AOA-23-iH two-channel analog input and output modules use HART communications to extract status, diagnostics, and other information to increase uptime, improve productivity, and enhance safety.

By Opto 22 September 27, 2014

Opto 22’s SNAP-AIMA-iH and SNAP-AOA-23-iH two-channel analog input and output modules use HART communications to extract status, diagnostics, and other information from smart devices such as field-mounted process transmitters and analyzers. This information can be used by the automation system and/or the asset management system to increase uptime, improve productivity, and enhance safety.

The SNAP-AIMA-iH analog input module has two isolated 4-20 mA input channels, and the SNAP-AOA-23-iH output module has two isolated 4-20 mA output channels. Each channel features an integrated HART modem that allows the channel to communicate digitally with the HART FSK (frequency-shift keying) signal imposed on the 4-20 mA current loop, enabling communication with the target smart device. 

The SNAP-AIMA-iH analog input module is categorized by the HART protocol as a current input connection type, which means that the module is a low-impedance device. The SNAP-AOA-23-iH analog output module is categorized by the HART protocol as a current output device, which means that each channel can provide the required loop current and is a high-impedance device. 

Each module also includes LED indicators to provide status information, such as HART channel operation, communication errors, or zero loop current or voltage reading. Both analog modules are transformer isolated as well as optically isolated from all other modules and from the I/O processor. 

Opto 22

Opto22 – Opto 22 

– Edited by CFE Media. See more Control Engineering I/O system and module products.


Author Bio: Opto 22 designs and manufactures industrial control products and Internet of Things platforms that bridge the gap between information technology (IT) and operations technology (OT). Based on a core design philosophy of leveraging open, standards-based technology, Opto 22 products are deployed worldwide in industrial automation, process control, building automation, industrial refrigeration, remote monitoring, and data acquisition applications. Designed and manufactured in the U.S.A., Opto 22 products have a worldwide reputation for ease-of-use, innovation, quality, and reliability. For over 40 years OEMs, machine builders, automation end-users, and information technology and operations personnel have and continue to trust Opto 22 to deliver high-quality products with superior reliability. The company was founded in 1974 and is privately held in Temecula, California, U.S.A. Opto 22 products are available through a global network of distributors and system integrators. For more information, contact Opto 22 headquarters at +1-951-695-3000 or visit www.opto22.com.