Allen Bradley 1738-IB8M12 DC Input Module

The Allen-Bradley 1738-IB8M12, also cataloged as the 1738-IB8M12 DC Input Module, operates as a dedicated hardware component for 24 VDC discrete signal ingestion and field device monitoring within Allen-Bradley ArmorPoint I/O platforms.

Hardware Specifications

EtherNet/IP Deterministic Networks and I/O Density Scaling

• EtherNet/IP Deterministic Networks: Maps discrete input channel states directly to ArmorPoint network adapters, executing real-time data transfers across backplane buses without network transmission delays.
• I/O Density Scaling: Integrates eight non-isolated sinking channels using M12 micro connectors into a single module, doubling local point density for direct machine-mount applications.
• Firmware Flash Compatibility: Supports synchronized execution profiles and diagnostic reporting through dedicated LED indicators for module status, network connections, and individual channel logic states.

Frequently Asked Questions

Q: What environmental ingress protection level does the 1738-IB8M12 module provide? A: The module is sealed in an IP 67 rated housing, protecting internal components against industrial dust, liquid immersion, and chemical exposure.

Q: What diagnostic LED indicators are provided on the 1738-IB8M12 module? A: The front panel includes 8 individual channel status LEDs, 1 module status LED, and 1 network status LED to indicate power, fault, configuration, and link conditions.

Q: What is the altitude installation threshold for the 1738-IB8M12 without performance derating? A: The module is rated for direct installation in environments up to 2000 meters above sea level without requiring electrical or thermal derating.

Field Installation Guidelines

• Mount the sealed module directly to equipment frames using specified mounting hardware, verifying complete seating against the surface to maintain IP 67 integrity.
• Connect field sensors via industrial M12 micro cable assemblies. Tighten threaded connector rings hand-tight to standard torque limits to prevent moisture penetration.
• Separate DC input signal cabling from high-voltage AC power lines within the physical machine layout to mitigate electromagnetic interference.
• Ensure external power bus supplies meet 24 VDC operating limits before applying power to input circuits.