Rockwell Products for Industrial Use

Overview

Brand Name:	Allen Bradley
Model Number:	1794-IB8
Country of Origin:	USA
Packaging Details:	Original new Factory Sealed
Delivery Time:	Delivery time in stock
Payment Terms:	T/T

Contact for quotation

Sales Manager:	Stella
Send an email:	[email protected]
Contact in Whatsapp:	+86 18159889985

Specifications

Parameter	Specification
Catalog Number	1794-IB8
Manufacturer	Rockwell Automation / Allen-Bradley
Product Family	FLEX I/O
Number of Inputs	8 (current-sinking)
Onstate Voltage (min.)	10V DC
Onstate Voltage (nom.)	24V DC
Onstate Voltage (max.)	31.2V DC
Onstate Current (min.)	2.0 mA
Onstate Current (nom.)	8.0 mA
Onstate Current (max.)	12.0 mA
Offstate Voltage (max.)	5.0V DC
Offstate Current (max.)	1.5 mA
Nominal Input Impedance	4.6 kΩ
Isolation Voltage	50V continuous (Basic Insulation Type); type tested @ 850V DC for 60 s between field side and system; no isolation between individual channels
Flexbus Current	20 mA @ 5V DC
Power Dissipation (max.)	3.5 W @ 31.2V DC
Thermal Dissipation (max.)	11.9 BTU/hr @ 31.2V DC
Surrounding Air Temperature Range	–20°C to +55°C (–4°F to +131°F)
Storage Temperature	–40°C to +85°C
Relative Humidity	5 to 95% non-condensing
Altitude	Up to 2000 m (6562 ft) without derating
Agency Certifications	c-UL-us (Class I Division 2 Groups A-D), UK/CE, ATEX (Ex ec IIC T3 Gc), IECEx (Ex ec IIC T3 Gc), RCM, KC
Terminal Base Compatibility	1794-TB3, 1794-TB3S
Dimensions	9.4x5x5.5cm
Weight	0.08kg

Description

The 1794-IB8 is an 8‑channel DC sinking input module from Rockwell Automation‘s FLEX I/O family, engineered to interface discrete field devices with programmable automation controllers. The 1794-IB8 accepts 24V DC signals from sourcing sensors such as pushbuttons, limit switches, and proximity sensors, converting them to logic‑level data for the controller. The 1794-IB8 mounts on a terminal base (1794‑TB3 or 1794‑TB3S) and connects to the backplane via the Flexbus connector. With a nominal input current of 8 mA, adjustable filter times up to 32 ms, and hazardous location approvals (Class I Division 2, ATEX Zone 2), the 1794-IB8 delivers reliable performance in demanding industrial environments.

Applications

Discrete Manufacturing – Monitoring pushbuttons, selector switches, and limit switches on packaging lines, conveyors, and assembly machinery
Material Handling Systems – Sensing product presence, position feedback, and jam detection via photoelectric sensors and proximity switches in automated warehouses
Process Control – Monitoring tank level switches, valve position feedback, and pump status in batch processing and continuous flow applications
Safety Interlock Systems – Receiving signals from guard door switches, emergency stop pushbuttons, and safety light curtains (when integrated with appropriate safety controllers)
Remote I/O Networks – Deploying in distributed I/O architectures using 1794-ASB (Remote I/O), 1794-AENT (EtherNet/IP), 1794-ADN (DeviceNet), or 1794-APBDPV1 (PROFIBUS) adapters
Hazardous Area Installations – Suitable for Class I Division 2 and ATEX/IECEx Zone 2 environments when mounted in appropriately rated enclosures

Features

8 Sinking DC Inputs – Accepts 24V DC signals from sourcing field devices with 2.0 mA minimum on‑state current
Wide Operating Voltage Range – Supports 10…31.2V DC, accommodating variations in field power supplies and cable voltage drops
Programmable Input Filtering – Eight selectable filter times (0.25 to 32 ms) via configuration bits to reject contact bounce and electrical noise
Flexbus Backplane Connection – Interfaces to the I/O backplane through the Flexbus connector for high‑speed data exchange with the adapter or neighboring modules
Hazardous Location Approvals – Certified for Class I Division 2 Groups A-D, ATEX/IECEx Zone 2 (Ex ec IIC T3 Gc), and CCC Ex for global deployment
Flexible Wiring Options – Supports 2‑wire and 3‑wire field devices (limit switches, proximity sensors, photoelectric sensors) with clear terminal numbering
Compact Modular Form Factor – Occupies a single FLEX I/O terminal base slot, maximizing panel density and simplifying system expansion
Diagnostic LED Indicators – Individual input status LEDs provide real‑time visual indication of each channel‘s ON/OFF state
Wide Temperature Operation – Operates from –20°C to +55°C, suitable for demanding industrial environments
Terminal Base Keying – Keyswitch (position 2) ensures correct module installation and prevents improper insertion

Competitive Advantage

High I/O Density in a Compact Footprint – The 8‑point design provides efficient channel count per slot, reducing overall system hardware costs and panel space requirements compared to lower‑density alternatives.
Global Hazardous Area Approvals – With c‑UL‑us Class I Division 2, ATEX/IECEx Zone 2 (Ex ec IIC T3 Gc), and CCC Ex certifications, the 1794‑IB8 simplifies system design for international projects requiring compliance with multiple safety standards.
Flexible Adapter Compatibility – Works seamlessly with a wide range of communication adapters—Remote I/O, ControlNet, DeviceNet, EtherNet/IP, and PROFIBUS—enabling integration into virtually any distributed I/O network architecture.
User‑Configurable Input Filtering – Eight selectable filter times allow precise tuning to match specific application needs, reducing false triggers from contact bounce or electrical noise without sacrificing response speed.
Dual‑wire and Three‑wire Support – Accepts both 2‑wire (signal + supply) and 3‑wire (signal + supply + common) field devices, providing flexibility for mixed sensor types in a single module.
Robust Industrial Design – Rated for –20°C to +55°C operation, 5‑95% humidity, and altitudes up to 2000 m, the module is built to withstand harsh factory floor conditions without derating.
Simplified Wiring and Maintenance – Clear terminal numbering and individual status LEDs accelerate installation, commissioning, and troubleshooting, reducing mean time to repair (MTTR).
TÜV Functional Safety Certified (1794‑IB16) – While the 1794‑IB8 is not TÜV SIL‑rated, the 1794‑IB16 variant offers SIL 2 capability, demonstrating Rockwell‘s commitment to safety and allowing for system‑wide safety integration using similar form‑factor modules.

Spare Parts and Accessories

Item	Catalog Number / Part	Description
Replacement Module	1794-IB8	Direct replacement for a failed or worn-out input module.
Terminal Base (Screw Clamp)	1794-TB3	Mounting base for field wiring connections; uses screw-type terminals.
Terminal Base (Spring Clamp)	1794-TB3S	Mounting base for field wiring; uses spring-clamp terminals for faster wiring.
Remote I/O Adapter	1794-ASB (Series E or later)	Interfaces the module to a Remote I/O network.
EtherNet/IP Adapter	1794-AENT (Series A, firmware ≥2.4)	Provides EtherNet/IP connectivity for the I/O rack.
DeviceNet Adapter	1794-ADN (Series B, firmware ≥2.4)	Enables DeviceNet network integration.
PROFIBUS Adapter	1794-APBDPV1 (Series B GSD)	Connects the module to a PROFIBUS network.
ControlNet Adapter	1794-ACN15 (Series C, firmware ≥4.1)	Provides ControlNet communication for the FLEX I/O system.
DIN Rail (Steel)	—	Zinc-plated chromate-passivated steel rail; secure to mounting surface every 200 mm; use end anchors.
Keyswitch	—	Set to position 2 on the terminal base for proper module keying.
Programming Software	Studio 5000 Logix Designer (v20 or later)	Required for module configuration and filter-time setting.
Documentation	1794-IN093 (Installation Instructions)	Detailed wiring, mounting, and configuration guidelines.
Grounding Guidelines	1770-4.1 (Industrial Automation Wiring and Grounding)	Covers proper grounding and noise immunity practices.
Dummy Cover (for empty slots)	—	Optional cover for unused terminal base slots to maintain airflow and protect against debris.