Product Details
Product Description
The 1734-IB8S (Part Number: 1734-IB8S) is a high-density safety input solution designed for the Allen-Bradley POINT I/O platform. This module is engineered to integrate seamlessly into SIL 3 and PLe safety applications, offering eight sinking input channels and four dedicated pulse test outputs. By utilizing CIP Safety protocol over EtherNet/IP or DeviceNet, it provides distributed safety control with advanced diagnostics for detecting short circuits and cross-channel faults in field wiring.
Technical Specifications and Hardware Parameters
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Product Brand: Allen-Bradley
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Module Identifier: 1734-IB8S
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Product Series: POINT I/O Guard I/O
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Input Quantity: 8 Safety Inputs
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Input Configuration: Current Sinking (Dry Contact or Solid State)
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Test Pulse Outputs: 4 Pulse Test Sources
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Nominal Operating Voltage: 24V DC
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Input Voltage Range: 19.2V DC to 28.8V DC
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POINTBus Current Draw: 175 mA at 5V DC
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Maximum Power Dissipation: 3.4 Watts
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Safety Certification: SIL 3 (IEC 61508) and PLe/Category 4 (ISO 13849-1)
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Thermal Performance: 2.8A total current capacity at 20°C ambient
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Compatible Terminal Bases: 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS
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Mechanical Keying: Position 8 (Key 1) and Position 1 (Key 2)
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Enclosure Rating: IP20 Open-style for cabinet mounting
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Hardware Revision Support: Series A and Series B
Module Functional Features and Safety FAQ
How do the pulse test outputs improve circuit safety?The 1734-IB8S generates specific pulse patterns on its four test outputs. When these are wired through safety devices back to the inputs, the module can detect if a wire has been crushed, shorted to a 24V power source, or shorted to another input signal. This prevents a "stuck-on" failure which could bypass a safety function.
Can this module be used with standard 1734 adapters?No, to utilize the safety functions of the 1734-IB8S, you must use a safety-rated network adapter such as the 1734-AENTR (for EtherNet/IP) and a GuardLogix or SmartGuard controller that supports CIP Safety communications.
What is the significance of the thermal derating value?At an ambient temperature of 20°C, the module can handle a cumulative field power current of 2.8A across all channels. As the temperature inside the electrical cabinet increases toward the maximum operating limit of 55°C, the allowable current decreases. Engineers must calculate the total load of connected sensors to ensure the module remains within its safe thermal operating envelope.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Understanding Root Causes of Unplanned PLC Stop Mode in Industrial Automation
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Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.