Purchase now: Allen-Bradley 1756-IF16H HART Analog Module
Purchase now: Atlantechdrives provides you the 1756-IF16H, a revolutionary, top-tier 16-channel analog input module featuring embedded HART (Highway Addressable Remote Transducer) protocol capabilities, masterfully engineered by Rockwell Automation for the ControlLogix 1756 platform. In advanced process industries like oil and gas, pharmaceuticals, and continuous chemical batching, standard 4-20mA signals only tell half the story. The 1756-IF16H is a massive game-changer. It reads the standard 4-20mA analog Primary Variable (like a tank’s fluid level), but simultaneously decodes the high-frequency digital HART data superimposed directly on top of the exact same two copper wires. This allows the ControlLogix processor to extract up to four additional digital variables (SV, TV, QV) from a single smart instrument—such as temperature and density from a Coriolis mass flowmeter—while also constantly monitoring the instrument’s internal diagnostic health. Crucially, the 1756-IF16H has the HART modem built directly into the module silicon, completely eliminating the need to purchase, wire, and maintain expensive external third-party HART multiplexer panels.
Technical Specifications of the 1756-IF16H
The 1756-IF16H utilizes incredibly high-resolution 16-bit analog-to-digital conversion, ensuring flawless process control while seamlessly parsing HART v5, v6, and v7 digital packets across all channels simultaneously.
- Part Number: 1756-IF16H
- Platform: ControlLogix 1756 System
- Input Type: Analog Current with Embedded HART Protocol
- Number of Channels: 16 Single-Ended or 8 Differential
- Input Range: 0…20mA, 4…20mA (HART requires 4-20mA)
- HART Compatibility: Fully supports HART versions 5, 6, and 7
- Resolution: 16-bit precision
- Backplane Current Draw: 250 mA at 5.1V DC; 75 mA at 24V DC
Expert Tips: The Power of Asset Management Pass-Through
While pulling additional process variables into the PLC logic is fantastic, the true superpower of the 1756-IF16H lies in instrument maintenance and calibration. Expert Tip: Historically, if a technician needed to recalibrate a smart pressure transmitter, they had to walk out into the hazardous plant floor, open the instrument housing, and plug in a handheld HART communicator. The 1756-IF16H supports full CIP-to-HART pass-through routing. This means an instrument engineer sitting in a safe, air-conditioned control room can open an FDT/DTM software package (like Endress+Hauser FieldCare, PACTware, or Rockwell’s FactoryTalk AssetCentre) on their laptop, connect to the ControlLogix chassis over EtherNet/IP, and route directly through the 1756-IF16H module to remotely calibrate, configure, and troubleshoot the field instrument. This saves thousands of hours of dangerous field labor and prevents unnecessary process shutdowns.
Installation Advice: HART Loop Resistance Requirements
To successfully transmit the high-frequency digital HART signal on top of a standard 4-20mA DC current loop, the physical wiring circuit must possess a specific amount of electrical resistance. The HART protocol strictly requires a minimum of 250 ohms of total loop resistance to develop a measurable voltage signal that the internal modems can detect. If your field wiring distance is extremely short and you are using a high-quality 24V DC power supply, your natural copper resistance may be too low, and the 1756-IF16H will fail to establish HART communication (though the analog 4-20mA signal will still work). In these cases, you must physically install a 250-ohm, high-precision resistor in series with the loop to satisfy the protocol requirements.
Frequently Asked Questions (FAQs)
Q: Can I use the 1756-IF16H with standard, non-HART 4-20mA instruments?
A: Yes, absolutely. The module is fully backwards compatible. If you connect a standard «dumb» 4-20mA sensor, the module will simply read the analog current perfectly, just like a standard 1756-IF16 would, ignoring the lack of digital HART data.
Q: Do I need a separate HART modem or multiplexer if I use this module?
A: No. That is the massive advantage of the 1756-IF16H. The HART demodulators are built directly onto the module’s printed circuit board, saving vast amounts of cabinet space, wiring labor, and hardware costs compared to legacy multiplexer architectures.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This 16-channel analog input module is commonly integrated into process control systems managed by an SLC 5/03 or ControlLogix 5573 series brain.
For advanced instrument diagnostics via HART protocol, this module requires the data integrity provided by the 1756-BA2 energy storage module.
