Allen‑Bradley 1756-OF8H is an 8-channel HART-capable analog output module
Allen‑Bradley 1756-OF8H is an 8-channel HART-capable analog output module - Image 2

Allen‑Bradley 1756-OF8H is an 8-channel HART-capable analog output module

  • 1756-OF8: Standard 8-ch analog output module without HART, suitable for conventional analog control loops.
  • 1756-OF8HK: Conformal coated variant of 1756-OF8H for corrosive, humid or dusty harsh environments.
  • 1756-OF8IH: 8-channel isolated HART analog output module with channel-to-channel isolation.
  • 1756-IF8H: 8-channel HART analog input module, matching 1756- for paired HART I/O system design.
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Description

 Allen‑Bradley 1756-OF8H is an 8-channel HART-capable analog output module

 

Product Title & Description

Model: 1756-OF8H The Allen‑Bradley 1756-OF8H is an 8-channel HART-capable analog output module for Rockwell Automation ControlLogix platform. It provides configurable current and voltage analog outputs together with built-in HART modem to communicate with HART field transmitters and valve positioners. Designed for process control in petrochemical, power, water treatment and manufacturing plants, this module delivers high-precision analog control plus smart instrument diagnostics over the same field wiring.

 

Core Product Overview

1756-OF8H belongs to the ControlLogix 1756 I/O family, serving as a high-performance analog output interface between ControlLogix controller and field HART-enabled process instruments. It supports per-channel configuration for voltage or current signals, with 15–16 bit high resolution. The integrated HART function allows bi-directional communication: not only sending analog setpoints to field devices, but also reading device status, diagnostic alarms, tag information and calibration data without extra wiring. Open-circuit detection is included for current loops to simplify troubleshooting. This module occupies one single slot in ControlLogix chassis and requires separate removable terminal block (RTB) for field wiring. It is widely adopted in continuous process automation where smart HART instruments are deployed.

1756-OF8H

Main Technical Specifications

  • Manufacturer: Rockwell Automation (Allen‑Bradley)
  • Part Number: 1756-OF8H
  • Product Type: 8-channel Analog Output Module with HART
  • Series: ControlLogix 1756
  • Number of Output Channels: 8
  • Signal Ranges:
    • Current: 0–20 mA, 4–20 mA (max 0–21mA)
    • Voltage: -10.4 VDC ~ +10.4 VDC
  • Resolution: 15–16 bits
  • Accuracy: ±0.1% of full range (voltage); ±0.5% of full range (current)
  • Backplane Power Draw: 5.1V DC @230mA; 24V DC @230mA
  • Max Power Dissipation: 6.54 W
  • Isolation: Channel-to-backplane isolation; no isolation between individual output channels
  • Response Time: 8.5 ms (voltage), 23 ms (current)
  • Supported Protocol: HART 5 / HART 7
  • Operating Temperature: 0°C ~ +60°C
  • Ambient Humidity: 5% to 95%, non-condensing
  • Certifications: CE, ATEX, IECEx, RCM, CCC
  • Required Terminal Blocks: 1756-TBNH / 1756-TBSH (sold separately)
  • Mounting: Single slot in ControlLogix chassis

 

Quality Control Procedures

All Rockwell Automation modules comply with ISO9001 quality system and relevant IEC industrial standards.

  1. Component incoming inspection: Semiconductors, PCBs and passive components are sourced from approved suppliers, with 100% incoming screening.
  2. Automated assembly & traceability: SMT and final assembly are executed on automated lines. Serial number tracking enables full lifecycle traceability.
  3. Functional calibration & testing: Every finished module undergoes full channel calibration, HART communication test, over-range test and open-circuit detection verification.
  4. Environmental stress screening: Batch samples go through temperature cycling, vibration and EMC testing to validate robustness for industrial environments.
  5. Final visual inspection & packaging: Units passing all tests are labeled, packed with anti-static and shock-proof packaging, and released with factory test records.

 

Brand Related Model Recommendations

  • 1756-OF8: Standard 8-ch analog output module without HART, suitable for conventional analog control loops.
  • 1756-OF8HK: Conformal coated variant of 1756-OF8H for corrosive, humid or dusty harsh environments.
  • 1756-OF8IH: 8-channel isolated HART analog output module with channel-to-channel isolation.
  • 1756-IF8H: 8-channel HART analog input module, matching 1756- for paired HART I/O system design.

All above modules fit the same ControlLogix chassis, sharing similar software configuration workflow for system expansion and replacement.

 

Frequently Asked Questions (FAQ)

Q1: What PLC system is 1756- compatible with? A1: It works with ControlLogix 5550, 5560, 5570 and 5580 series controllers under RSLogix 5000 / Studio5000 environment.

Q2: Is the terminal block included with 1756-? A2: No. The RTB terminal block (1756-TBNH or 1756-TBSH) must be ordered separately.

Q3: What can the HART function of this module do? A3: It writes analog setpoints and reads HART device variables, diagnostics, alarm status and tag information from HART smart valves, transmitters and positioners.

Q4: Can I mix current and voltage outputs on different channels of one module? A4: Yes. Each of the 8 channels can be independently configured as current or voltage mode via Studio5000 software.

Q5: What is the warranty of original Allen‑Bradley module? A5: Standard 12-month factory warranty against manufacturing defects under proper installation and operating conditions.

 

Installation & Configuration Guide

7.1 Pre-installation Preparation

Verify part number and inspect module for physical damage. Prepare compatible ControlLogix chassis, RTB terminal block, shielded field cables and Studio5000 programming software. Power off the chassis before handling the module. Wear ESD protection to prevent electrostatic damage to electronics. Confirm field instrument signal type (current/voltage) and HART device compatibility.

7.2 Installation Steps

Insert the module into an empty slot of ControlLogix chassis and lock the module latch. Mount the selected RTB onto the module. Route shielded field wiring to RTB terminals following Rockwell wiring diagram. Tighten terminals to specified torque and connect cable shield to proper grounding point. Double-check wiring to avoid short circuit or reversed polarity. Maintain proper airflow clearance around chassis for heat dissipation.

7.3 System Configuration & Commissioning

Launch Studio5000, add 1756- to the I/O tree. Configure each channel for current or voltage range and enable HART communication as required. Download project to ControlLogix controller. Perform module health check and channel calibration. Verify analog output response and HART device communication. Test open-circuit diagnostic function for current loops. Record calibration and commissioning data.

7.4 Maintenance & Precautions

Keep chassis cabinet clean and within rated temperature range. Inspect terminal tightness and cable shielding during scheduled shutdowns. Do not exceed maximum voltage/current ratings. Do not disassemble module housing. If faults occur, check wiring, loop resistance and HART device status before module replacement.

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