Analog I/O module Allen-Bradley model 1756-OF8H

Technical specifications

Lifecycle Status

Active

Repair Options Available

Yes

Display

Module Health, In Calibration,Mode

Isolation

None between channels (Single,Ended)

Number of channels

8

Output signal

+/- 10.4V, 0-20 mA, 4-20 mA

Special Features

Supports HART Protocol

Analogue inputs configurable

true

Analogue outputs configurable

false

Calibrated accuracy

Voltage: Better than 0.1% of range @ 25 °C (77 °F) with HART disabled, Current: Better than 0.15% of range @ 25 °C (77 °F) with HART disabled

Conducted RF immunity

10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz

Data format

Integer mode (left justified, 2 s complement) IEEE 32-bit floating point

EFT/B immunity

±2kV @ 5kHz on signal ports

Emissions

IEC 61000-6-4

Enclosure type rating

None (open-style)

ESD immunity

6 kV contact discharges, 8 kV air discharges

Gain drift with temperature

Voltage: 20 ppm/°C, Current: 35 ppm/°C

Input conversion method

Successive approximation

Input, current

true

Input, resistance thermometer

false

Input, resistor

false

Input signal, configurable

true

Input, thermocouple

false

Input, voltage

true

Isolation voltage

50V (continuous), basic insulation type, output channels to backplane, No isolation between individual output channels type tested at 1500V AC @ 60s

Load reactance

Voltage: 1 µF, Current: 10 µH

Module error

Voltage: 0.15% of range, Current: 0.3% of range

Module HART scan time

Analog: 12 ms, minimum, floating point, HART: typically 1 s per HART channel enabled. Estimate 10 s if all 8 channels have HART enabled, Pass through messages, handheld communicators, sary masters, communication errors, or configuration changes can s

Module keying

Electronic, software configurable

Nonoperating temperature

-40 °C

North American temperature code

T4

Offset drift

100 µV/°C, 200 nA/°C

Open circuit detection time

Current output only (output must be set to <0.1 mA)

Operating temperature

0 °C <Ta <60 °C (32 °F <Ta <140 °F)

Output conversion method

R-Ladder DAC, monotonicity with no missing codes

Output, current

false

Documents / datasheets

Source reviewed: 2026-10-24

Description

Analog I/O module Allen-Bradley part number 1756-OF8H; Number Of Channels: 8; Output Signal: +/- 10.4V, 0-20 mA, 4-20 mA; Input, current: true. Technical specifications, condition and supply feasibility are checked before ordering.