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Allen-Bradley 1756-IB16I Safety I/O Module

1. Product Description

The 1756-IB16I is a 16-channel digital input module designed for ControlLogix systems, featuring individual channel isolation for enhanced safety in industrial automation applications. It supports 10–30V DC inputs and provides SIL 3/PLe safety certification, making it suitable for critical safety systems .

2. Key Features

High Safety Compliance – Certified for SIL 3 (IEC 61508) and PLe (ISO 13849-1), ensuring reliable performance in safety-critical applications .
Individual Channel Isolation – Each of the 16 input channels is electrically isolated (250V continuous), preventing cross-channel interference .
Diagnostic Capabilities – Features LED indicators for input status, communication health, and module diagnostics, aiding in quick troubleshooting.
Flexible Integration – Compatible with ControlLogix 5580 and GuardLogix controllers, supporting CIP Safety protocols .
Robust Industrial Design – Operates in -40°C to +70°C environments with IP20 protection, suitable for harsh conditions .

3. Technical Specifications

Parameter	Specification
Input Type	DC Digital (Sinking/Sourcing)
Input Voltage Range	10–30V DC
Number of Channels	16 (individually isolated)
Isolation Voltage	250V continuous (channel-to-channel)
Safety Certification	SIL 3, PLe, CE, UL, CSA, GOST
Power Consumption	5.1V DC @ 150mA (backplane)
Mounting	ControlLogix Chassis

4. Applications

Machine Safety Systems – Emergency stop (E-stop) circuits, safety interlocks .
Process Industry – Safety shutdown systems in oil & gas, chemical plants.
Robotics – Collaborative robot (cobot) safety monitoring .
Transportation – Railway signaling and safety controls .

5. Installation & Precautions

Wiring Compliance – Use shielded cables in high-noise environments to prevent signal interference .
Grounding – Ensure proper grounding to minimize electrical noise and ensure safety compliance .
Channel Configuration – Verify input voltage compatibility (10–30V DC) before installation .
Safety Validation – Perform functional safety tests after installation to ensure SIL 3/PLe compliance .