1756-IF16H ControlLogix 16 Pt Analog Input HART Module - PLC Provider Industrial Automation Supplier PLC HMI Drives

Table of Contents

What is 1756-IF16H?

The 1756-IF16H is a high-performance 16-channel analog input module belonging to the ControlLogix series. It plays the role of a “perception hub” in industrial automation systems, responsible for converting continuous physical quantities (such as temperature, pressure, flow rate, etc.) from on-site sensors into precise digital signals that the control system can recognize.
The 1756-IF16H is an enhanced version of the basic model 1756-IF16, and its main feature lies in supporting the HART communication protocol. The HART protocol enables the superimposition of digital communication on traditional 4-20mA analog signals, facilitating advanced diagnosis, field instrument configuration, and real-time status monitoring.

1756-IF16H Features and Functions

Features:

High-precision conversion: Using sigma-delta ADC (24-bit converter) with a resolution of 16 to 21 bits and a typical accuracy of ±0.05% of full scale, it can provide accurate analog-to-digital conversion.
HART Protocol Support: Supports HART protocol versions 5, 6, and 7 with a dedicated HART modem per channel to communicate directly with HART field devices without the need for an external HART multiplexer or additional wiring.
Flexible channel configuration: It has 16 analog input channels and supports three signal wiring configurations: single-ended, differential and high-speed differential. It can be flexibly selected according to actual needs to adapt to different signal input requirements.
Simplified system architecture: Field devices can be directly connected to the I/O module, eliminating the need for additional HART multiplexers, saving installation costs and space, and simplifying the system architecture.
Harsh environment adaptation: Some versions are equipped with coating protection, which can provide reliable protection in harsh industrial environments and ensure stable operation of the module.
Hot-swappable function: Supports hot-swapping and is equipped with removable terminal blocks for quick installation and maintenance, reducing system downtime.

Functions:

Analog input and processing: Accepts a variety of current and voltage signals, such as ±10V, 0 – 10V, 0 – 5V, 0 – 20mA and 4 – 20mA, etc., and performs real-time sampling and processing of these analog input signals to provide accurate data for subsequent control and analysis.
HART communication and device management: Through the HART protocol, the primary value (PV), secondary value (SV), tertiary value (TV) and fourth value (FV) of the HART device can be read and written. These values can be directly applied to control applications as controller tags. It can also be used with mainstream asset management software, such as Device Type Manager (DTM) and Asset Manager software to realize the configuration, monitoring and management of HART devices.
Fault detection and diagnosis: It has a variety of fault detection functions, such as under-voltage, over-voltage detection, disconnection detection, etc., and also provides process alarm, rate alarm and other functions, which can promptly detect and report abnormal conditions during module operation, and the HART device configuration and diagnostic information can be viewed in the Studio 5000 Automation Engineering & Design Environment software to facilitate maintenance and troubleshooting.
Channel Parameter Configuration: Engineering units, filtering, and real-time sample rate can be adjusted for each channel. “Current Only” or “Current and HART” can be selected to increase information availability, and HART data can be accessed without writing application code.

1756-IF16H Usage Steps

Hardware installation:

Installation location selection: Install the module in a suitable slot location in the ControlLogix rack, ensuring sufficient space and good cooling conditions.
Connection Terminals: Use the separately ordered Removable Terminal Block (RTB) or 1492 Analog Interface Module (AIFM) to connect all field-side wiring. Make input/output, power and ground connections via the pins of the RTB or AIFM and secure them to the module using locking pins to prevent accidental loosening.

Software configuration

Using Studio 5000 software: Configure the module in Studio 5000 Automation Engineering & Design Environment software. First, you need to add the device description file of the 1756-IF16H module to the software so that the software can recognize and manage the module.
Channel parameter settings: Engineering units, filtering and real-time sampling rate can be adjusted for each channel. Each channel can also be selected with “current only” or “current and HART” options to increase the availability of information. For example, if you only need to collect analog current signals, you can select “current only”; if you also need to obtain digital information from HART devices, select “current and HART”.
HART Device Configuration: Supports read/write functionality for HART protocol versions 5, 6, and 7. In the software, you can view the primary value (PV), secondary value (SV), tertiary value (TV) and fourth value (FV) of the HART device and apply these values directly to the control application as controller tags. The parameters of the HART device can also be set through software, such as PV unit, range, etc.

Communicate with HART devices

Direct connection to HART devices: Each channel of the 1756-IF16H has a dedicated HART modem that communicates directly with HART devices in the field without the need for an external HART multiplexer or additional wiring.
Data collection and management: Analog signals and HART digital data can be collected at the same time, and asset management of HART devices, such as configuration, calibration, diagnosis, etc., can be realized through Device Type Manager (DTM) and Asset Manager software.

Troubleshooting and maintenance

Status LED Viewing: There are status LEDs on the module that display the status of communications, module health, and input/output devices. Through the status of the indicator light, you can quickly determine whether the module is operating normally and whether there is a fault.
Software diagnostic information viewing: In the Studio 5000 software, you can view module fault reports, channel fault labels, channel status labels and other information to help users accurately locate the cause of the fault and perform corresponding maintenance and processing. In addition, the module supports hot swapping, which allows module replacement or maintenance while the system is running, reducing downtime.

It should be noted that the 1756-IF16H needs to be used with a specific removable terminal block (such as 1756-TBCH or 1756-TBS6H).

FAQ

1.What is the accuracy of the analog input of the 1756-IF16H module?

The analog input accuracy of the 1756-IF16H module varies depending on the input signal type, as follows:
Voltage input range: Calibration accuracy better than 0.05%.
Current input range: Calibration accuracy better than 0.15%.
Additionally, the module features a sigma-delta ADC (24-bit converter) with a resolution of 16 to 21 bits and a module error of 0.3% of range over temperature with HART disabled.

2. What is the temperature range of the 1756-IF16H module?

The operating temperature range of the 1756-IF16H module is 0°C – 60°C. Non-operating temperature range is – 40℃ – 85℃.

3. What is the analog input impedance of the 1756-IF16H module?

The analog input impedance of the 1756-IF16H module varies depending on the input signal type, from greater than 10 megohms for voltage inputs to 249 ohms or 250 ohms for current inputs.

Conclusion

In general, 1756-IF16H is a powerful and reliable ControlLogix series analog input module. Its high channel count, high accuracy, wide signal compatibility and critical HART protocol support make it an ideal choice for high-precision data acquisition and intelligent equipment management in complex industrial environments, especially in process industries.