DATA SHEET HART SNAP I/O Modules Form 2080-150402 HART SNAP I/O Modules Features Channel-to-channel isolation Rugged packaging and convenient pluggable wiring. Accepts up to 14 AWG wire. Factory calibrated no user adjustment necessary Communicates digitally with HART current loop devices Description HART SNAP I/O modules for analog current input and output isolation gives you complete freedom from ground-loop provide communication with other Highway Addressable problems even on grounded devices connected to channels Remote Transducer (HART) current loop devices. on the same module. Each channel on each module features an integrated HART Transformer isolation prevents ground loop currents from modem that allows the channel to communicate digitally flowing between field devices and causing noise that with a HART FSK (frequency-shift keying) signal superimposed produces erroneous readings. Ground loop currents are onto the analog 420 mA current loop. The channel is a caused when two grounded field devices share a connection, master device when used together with SNAP PAC brains or and the ground potential at each device is different. controllers to communicate with other HART current loop devices in either point-to-point or multidrop configurations. Transformer isolation provides 1500 volts of transient (1500 V for 1 s) protection for control electronics from industrial field Current input and output modules are available. Both provide signals. channel-to-channel isolation and are factory calibrated. SNAP-AIMA-iH Input Module Using HART SNAP I/O Modules The SNAP-AIMA-iH provides two channels of isolated analog HART SNAP I/O modules are part of the SNAP PAC System. input current with a range of 420 mA. External loop power They mount on SNAP PAC racks alongside other SNAP I/O supplies are required for current loops. modules (analog, digital, and serial), so you have the combination of I/O you need at any location. As shown in the The SNAP-AIMA-iH is categorized by the HART protocol as a diagram on the following page, the SNAP PAC I/O unit can current input connection type, which means that the module communicate over a standard Ethernet network to databases, is a low impedance device. HMIs, and other devices. These modules require a SNAP PAC brain or rack-mounted SNAP-AOA-23-iH Output Module controller for I/O processing and communications. They are The SNAP-AOA-23-iH provides two channels of isolated not compatible with legacy brains and controllers. analog output current with a range of 420 mA. External loop power supplies are required for current loops. HART SNAP I/O modules are designed for use with a SNAP PAC programmable automation controller and PAC Control The SNAP-AOA-23-iH is categorized by the HART protocol as a automation software. Several HART-specific PAC Control current output device, which means that each channel commands (available in PAC Control version 9.4 and higher) controls the loop current and is a high impedance device. Part Numbers Isolation Part Description All SNAP analog modules are transformer isolated as well as Isolated two-channel analog current input, SNAP-AIMA-iH optically isolated from all other modules and from the I/O HART communication, 420 mA processor. In addition, the modules in this data sheet have all Isolated two-channel analog current SNAP-AOA-23-iH output, HART communication, 420 mA channels isolated from each other. Channel-to-channel Opto 22 43044 Business Park Drive Temecula, CA 92590-3614 www.opto22.com PAGE SALES 800-321-6786 951-695-3000 FAX 951-695-3095 sales opto22.com SUPPORT 800-835-6786 951-695-3080 FAX 951-695-3017 support opto22.com 1 20142015 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.HART SNAP I/O Modules System Architecture - HART SNAP I/O Modules make it possible for these modules to communicate any HART command that adheres to the HART request- response model or the burst message model. In your PAC Control strategy you will need to assemble all request data sent to the module and to parse all response data returned by the module. In this way the modules can communicate with any wired HART device using any HART command. For details and examples on all PAC Control commands, see form 1701, the PAC Control Command Reference, available at www.opto22.com. The HART-specific PAC Control commands include: Get HART Unique Address Send/Receive HART Command Receive HART Command Receive HART Command Burst In addition, the following string commands (also in PAC Control version 9.4 and higher) should be useful: HART Developer Toolkit Pack Float into String HART SNAP I/O modules can also be used without PAC Control. Opto 22 offers the Pack Integer 32 into String SNAP PAC .NET HART developer toolkit so you can easily integrate HART SNAP I/O Pack Integer 64 into String modules into an existing .NET/Mono application. Pack String into String This toolkit is available for download at www.opto22.com. Unpack String LEDs Each module includes four LED indicators on the top of the module. LEDs 1 and 3 refer to channel 0 LEDs 2 and 4 refer to channel 1. LED 1 or 2 LED 3 or 4 Description Status Activity Solid Green Blinking Green HART channel is operational loop voltage and current are within limits. HART communication error: On a SNAP-AOA-23-iH, check loop voltage. Excessive load resistance or an incorrect loop power supply may cause voltage to be too low. Solid Red Blinking Red On a SNAP-AIMA-iH, check loop current to make sure it is between 3.9 mA and 20.2 mA. NOTE: If loop voltage and current are correct, contact Product Support. Current loop open or loop voltage is zero. Implies that the channel is not OFF -- being used. Opto 22 43044 Business Park Drive Temecula, CA 92590-3614 www.opto22.com PAGE SALES 800-321-6786 951-695-3000 FAX 951-695-3095 sales opto22.com SUPPORT 800-835-6786 951-695-3080 FAX 951-695-3017 support opto22.com 2 20142015 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations. DATA SHEET HART SNAP I/O Modules Form 2080-150402