ControlLogix 8 Pt Isolated Analog Input Module 1756-IF8IH Channel PLC

Manufacturer	Allen Bradley
Part Number	1756-IF8IH
Product Type	PLC

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Description
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Overview

1756-IF8IH is a ControlLogix 8-channel isolated HART current analog input module. It has a built-in independent HART modem for each channel and 250V AC continuous isolation between channels and between channels and backplanes. It provides 16-21-bit resolution current signal acquisition and supports 0-20mA and 4-20mA standard industrial current signals.

Specification

Feature	Specification
Input Channels	8 differential current input channels, independent isolation per channel
Signal Types	0-20mA, 4-20mA (supports 2-wire/4-wire HART transmitters)
Resolution	16-21 bits (programmable, depending on filter settings)
HART Capability	Independent HART modem per channel, supports HART 5/6/7 versions, does not support burst mode/PSK/multi-drop configuration
Isolation Rating	250V AC continuous isolation between channels; 250V AC enhanced isolation between channels and backplane
Sampling Rate	Programmable, typical scan time per channel < 10ms in standard mode
Diagnostic Functions	Open-circuit detection, over/under-range alarm, module temperature monitoring, HART communication status diagnosis
Physical Characteristics	36-pin connector, single-slot installation in ControlLogix chassis, supports hot swapping

FAQ:

1.What standard industrial current signal types does the 1756-IF8IH support, and is it compatible with 2-wire/4-wire HART transmitters?

The standard industrial current signal types supported by the 1756-IF8IH are 0-20mA and 4-20mA.

1756-IF8IH is compatible with 2-wire and 4-wire HART transmitters. Each channel is equipped with an independent HART modem, which can simultaneously collect analog current signals and HART digital diagnostic data.

2.What versions of the HART protocol does the 1756-IF8IH support? Does it support burst mode or multi-station configuration?

1756-IF8IH supports three versions of HART 5, HART 6, and HART 7; it does not support HART burst mode (burst mode) and multi-drop (multi-drop / multi-point) configuration, and is only suitable for point-to-point HART communication scenarios.

3.What are the core functional differences between the 1756-IF8IH and the 1756-IF8I and 1756-IF8H modules?

Comparison Item	1756-IF8IH	1756-IF8I	1756-IF8H
Full Module Name	8-channel Isolated HART Current Analog Input Module	8-channel Universal Isolated Analog Input Module	8-channel Isolated HART Voltage/Current Analog Input Module
Supported Signal Types	Current signals only (0-20mA, 4-20mA)	Current (0-20mA) + Voltage (±10V, 0-10V, 0-5V)	Current (0-20mA, 4-20mA) + Voltage (±10V, 0-10V, 0-5V)
HART Functionality	Built-in independent HART modem per channel, supports HART 5/6/7	No HART functionality	Built-in independent HART modem per channel, supports HART 5/6/7
Isolation Design	250V AC continuous isolation between channels; 250V AC enhanced isolation between channels and backplane	250V AC continuous isolation between channels; 250V AC enhanced isolation between channels and backplane	250V AC continuous isolation between channels; 250V AC enhanced isolation between channels and backplane
Application Positioning	Dedicated to HART smart current transmitter acquisition, for high-precision monitoring and diagnosis in process industries	Universal analog signal acquisition, for current/voltage signal monitoring of non-intelligent devices	Hybrid system integration, supports both HART smart devices and general analog sensors
Typical Application Scenarios	Connection of HART smart pressure/flow/temperature transmitters in petrochemical, power energy industries	Connection of non-intelligent sensors (e.g. non-HART pressure sensors, level gauges) for basic monitoring	Mixed scenarios requiring simultaneous access to HART smart devices (current/voltage type) and general analog sensors

Looking for Original New ControlLogix 8 Pt Isolated Analog Input Module 1756-IF8IH Channel PLC?

We supply this 1756-IF8IH mainly to system integrators and maintenance teams for replacement and retrofit projects.

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