1756-OF8H

Overview

1756-OF8H is an 8-channel HART-enabled analog output module from Allen-Bradley, designed for precise voltage and current output control with integrated HART communication in ControlLogix systems.

General Information

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Series: ControlLogix

• Module Type: HART Analog Output Module

• Channels: 8 voltage or current outputs

• HART Support: 1 modem per module

• Isolation: None (single-ended)

• Electrical Connection: Screw/spring clamp (copper wire)

• Wire Category: 2 (signal ports)

• Terminal Block: 1756-TBNH, torque 1.36 Nm (12 in-lb)

• Module Keying: Electronic, software configurable

Electrical Specifications

• Output Ranges: −10…+10 V, 0…20 mA, 4…20 mA

• Output Signal: ±10.4 V, 0–20 mA, 4–20 mA

• Load Reactance: Voltage: 1 µF, Current: 10 µH

• Resolution: 15–16 bit for all ranges

• Output Conversion: R-Ladder DAC, monotonic

• Input Conversion: Successive approximation

• Data Format: Integer mode (2’s complement, left-justified), IEEE 32-bit floating point

• Offset Drift: 100 µV/°C, 200 nA/°C

• Gain Drift: Voltage: 20 ppm/°C, Current: 35 ppm/°C

• Module Error: Voltage: 0.15% of range, Current: 0.3% of range

• Overvoltage Protection: ±24 V DC

Performance

• Settling Time:

• Current (no HART): <23 ms to 95% with resistive loads

• Current (with HART): <37 ms to 95% with resistive loads

• Voltage: <8.5 ms to 95% with resistive loads

Power Requirements

• Backplane Current: 5.1 V DC @ 230 mA, 24 V DC @ 230 mA

• Total Backplane Power: 6.54 W

• Power Dissipation: 4.92 W

• Thermal Dissipation: 16.78 BTU/h

• Slot Width: 1

Environmental Conditions

• Operating Temperature: 0…+60 °C (32…140 °F)

• Non-Operating Temperature: −40 °C

• Relative Humidity: 5–95% non-condensing

• Vibration: 2 G @ 10…500 Hz

• Shock: 30 G operating, 50 G non-operating

Immunity & Protection

• ESD Immunity: 6 kV (contact), 8 kV (air)

• EFT/B Immunity: ±2 kV @ 5 kHz on signal ports

• Conducted RF Immunity: 10 V rms, 1 kHz sine-wave, 80% AM from 150 kHz–80 MHz

• Surge Protection: ±2 kV line-earth (CM) on shielded ports

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