Allen-Bradley 1756-OX8I ControlLogix Digital I/O Module

Only 5 item(s) left in stock

Manufacturer: Allen-Bradley
Product No.: 1756-OX8I
Country of origin:United States
Product Type: Digital I/O Module
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 260g
Dimensions: 3.5cm x 14cm x 14.5cm
Shipping port: Xiamen
Warranty: 12 months

The Allen-Bradley 1756-OX8I module provides eight isolated digital output contacts designed for integration within ControlLogix systems. This device supports both AC and DC voltage ranges, enabling control across diverse industrial applications. The 1756-OX8I features individually isolated output groups, ensuring safe and reliable operation in complex electrical environments. Engineered for seamless compatibility with ControlLogix backplanes, the module facilitates straightforward installation and maintenance in automation architectures. This module is ideal for applications requiring robust contact outputs, such as relay-based actuation, status indication, and small motor control. Its isolated design minimizes ground loops and enhances noise immunity, making it suitable for demanding industrial settings.

Features

Provides 8 N.O. (Normally Open) relay contacts.
Individually isolated output groups (two points per group) to minimize electrical interference.
Operates with a wide voltage range: AC (10...240V) or DC (5...125V).
High pilot duty rating (C300/R150) for reliable switching.
Includes status indicators for fault mode and scheduled outputs.
Software-configurable electronic keying to prevent improper module installation.
Open-style enclosure design for efficient heat dissipation.

Applications

Controlling external relays, solenoids, and contactors.
Providing status outputs for process instrumentation.
Driving indicator lights or audible alarms.
Interfacing with non-PLC controlled machinery in hybrid systems.
Small-scale motor start/stop control in isolated circuits.

Technical Specifications

Attribute	Value
Outputs	8 N.O. (Normally Open), individually isolated (two points per group)
Pilot Duty	C300/R150
Operating Voltage Range	5...125V DC10...240V AC
Contact Current Rating	1 A @ 5...30V DC0.5 A @ 48V DC0.22 A @ 125V DC1.5 A @ 250V AC 50/60 Hz0.75 A @ 480V AC 50/60 Hz
Output Delay Time	Off to On: 13 ms maxOn to Off: 13 ms max
Current Draw	@ 5.1V: 800 mA@ 24V: 100 mA
Total Backplane Power	2.9 W
Power Dissipation, max	3.1 W @ 60 degC (140 degF)
Thermal Dissipation	10.57 BTU/hr
Off-state Leakage Current	0 mA
Minimum Load Current	10 mA per point
Initial Contact Resistance, max	100 mOhm @ 6V 1A
Switching Frequency, max	1 operation/3 s (0.3 Hz at rated load)
Bounce Time, mean	1.2 ms
Expected Contact Life	300,000 cycles resistive100,000 cycles inductive
Scheduled Outputs	Synchronization within 167.6 ms, reference to the Coordinated System Time
States in Fault mode per point	Hold last state, On or Off (Off is default)
States in Program mode per point	Hold last state, On or Off (Off is default)
Isolation Voltage	250V (continuous), basic insulation type, outputs-to-backplane, and output-to-output
Module Keying	Electronic, software configurable
Fusing	Not protected. A fused IF6H is recommended to help protect outputs.
Removable Terminal Block	1756-TBCH1756-TBS6H
RTB Keying	User-defined mechanical
Slot width	1
Wire category	p(1)
Enclosure type	None (open-style)
North American temperature code	T4A

(1) Use this conductor category information for planning conductor routing as described in the system-level installation manual. See the Industrial Automation Wiring and Grounding Guidelines, publication 1770-4.1.

Environmental Specifications

Attribute	Value
Temperature, operating	0...60 degC (32...140 degF)IEC 60068-2-1 (Test Ab. Operating Cold)IEC 60068-2-2 (Test Bb. Operating Dry Heat)IEC 60068-2-14 (Test Nb. Operating Thermal Shock)
Temperature, nonoperating	-40...85 degC (-40...+185 degF)IEC 60068-2-1 (Test Ab. Unpackaged Nonoperating Cold)IEC 60068-2-2 (Test Bb. Unpackaged Nonoperating Dry Heat)IEC 60068-2-14 (Test Na. Unpackaged Nonoperating Thermal Shock)
Relative Humidity	5...95% noncondensingIEC 60068-2-30 (Test Db. Unpackaged Damp Heat)
Vibration	2 g @ 30...500 HzIEC 60068-2-6 (Test Fc. Operating)
Shock, operating	30 gIEC 60068-2-27 (Test Ea. Unpackaged Shock)
Shock, nonoperating	50 gIEC 60068-2-27 (Test Ea. Unpackaged Shock)
Emissions	IEC 61000-6-4
ESD Immunity	6 kV contact discharges8 kV air dischargesIEC 61000-4-2
Radiated RF Immunity	10V/m with 1kHz sine wave 80% AM from 80...2000 MHz10V/m with 200 Hz 50% Pulse 100% AM @ 800 MHz10V/m with 200 Hz 50% Pulse 100% AM @ 880 MHz30V/m with 1kHz sine wave 80% AM from 2000...2700 MHzIEC 61000-4-3
EFT/Burst Immunity	+-4 kV at 5 kHz on signal portsIEC 61000-4-4
Surge Transient Immunity	+-1 kV line-line (DM) and +-2 kV line-earth (CM) on signal portsIEC 61000-4-5
Conducted RF Immunity	10V rms with 1 kHz sine wave 80% AM from 150 kHz...80 MHzIEC 61000-4-6

Certifications

Certification(1)	Details
cULus	UL Listed Industrial Control Equipment, certified for US and Canada. See UL File E48599.UL Listed for Class I, Division 2 Group A,B,C,D Hazardous Locations, certified for US and Canada. See UL File E49480.
CE	European Union 2014/30/EU EMC Directive, compliant with:• EN 61326-1: Electrical Equipment for Measurement, Control and Laboratory Use. Industrial Requirements• EN 61000-6-2: Industrial Immunity• EN 61000-6-4: Industrial Emissions• EN 61508-2: Programmable Controllers (Clause 8.2 Zone A & B)• EN 61508-2: Programmable Controllers (Clause II)
RCM	European 2014/35/EU LVD, compliant with EN 61010-2: Programmable ControllersAustralian Radiocommunications Law, compliant with EN 61000-6-4: Industrial Emissions
FM	FM Approved Equipment for use in Class I Division 2 Group A,B,C,D Hazardous Locations
KC	Korean Registration of Broadcasting and Communications Equipment, compliant with Article 58-2 of Radio Waves Act, Clause 3
UKCA	In conformity with the following UK Statutory Instruments and their amendments:• 2016 No. 1091: Electromagnetic Compatibility Regulations• 2016 No. 1101: Electrical Equipment (Safety) Regulations• 2016 No. 107: Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres Regulations• 2012 No. 3032: Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment
Morocco	Arrêté ministériel n° 04-15 du 1er muharram 1437 (15 octobre 2015)Dispositions d'application relatives à la protection des équipements contre les influences de tensionArrêté ministériel n° 04-15 du 29 ramadan 1436 (16 juillet 2015)Compatibilité électromagnétique des équipements

(1) When product is marketed. See the Product Certification link at <a href="#">ra.rockwellautomation.com</a> for Declarations of Conformity, Certificates and other certification details.

Connections and Interfaces

Connector / Terminal	Function / Circuit Assignment
Supply Connections	• L1-0 to L1-7: Isolated AC/DC supply commons (Cut to Length)• DC-2 (H): Isolated DC supply common (Cut to Length)
Output Connections	• OUT-0 N.O. to OUT-7 N.O.: Individually isolated Form A (Normally Open) relay contacts
Mechanical	• Jumper Bar: For daisy chaining L1 supply to adjacent RTBs

Note: Connections are made via the removable 36-pin terminal block (1756-TBCH or 1756-TBS6H).

Field Installation Guidelines

CRITICAL RISK ASSESSMENT: ARC FLASH HAZARD AND EXPLOSION POTENTIAL. Do not disconnect mechanical wiring links or slide the Removable Terminal Block (RTB) off the locking connectors while active line voltages feed the contact termination blocks. High-potential energy fields present at relay output pins can arc, destroying the module or triggering localized power interruptions.

Chassis Alignment: Align the plastic card-guides of the module with the top and bottom channels of the target slot in the 1756 ControlLogix chassis bank.

Seating Mechanism: Slide the assembly firmly inward until the structural locking tabs click securely into place, bonding the dual-connector core to the active backplane interface.

Field Wire Termination: Strip your field cables to length, land the isolated AC/DC power lines onto the specific 36-pin RTB terminal blocks, and torque down the compression terminal screws to standard limits.

Surge Suppression: Install external surge suppression devices (such as varistors or snubbers) directly across inductive field loads to shield the internal mechanical relay contacts from high-voltage inductive kickback spikes.

RTB Mating: Push the pre-wired 1756-TBCH or 1756-TBSH block directly over the interface pins, snap the locking latch down, and thread the central retaining fasteners tightly to secure the field interface.

Key Features:

#ControlLogix #Digital I/O Modules

Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

What is the key advantage of individual channel-to-channel isolation on this relay assembly?

It provides complete electrical separation between points. This allows you to mix different AC line phases, voltage sources, or independent DC ground networks safely within a single physical module without cross-talk or short-circuits.

Does this contact module support immediate field replacement while under live chassis power?

Yes. The module is fully engineered to support Removal and Insertion Under Power (RIUP) workflows. You can swap the hardware out without downing the rest of the operational processing racks.

Why is external surge suppression recommended for the contact points?

Relay contact points are susceptible to wear from electrical arcing when driving inductive loads like solenoids or coils. Adding external suppression extends contact life and keeps high-frequency switching noise out of local electronics.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Color pattern	Black
Country of origin	United States
Power source	DC Power AC-powered

Allen-Bradley 1756-OX8I ControlLogix Digital I/O Module