Schneider Electric / Invensys / Foxboro DM400YL 120 VAC Input/Output Module

The Schneider Electric/Invensys/Foxboro DM400YL is a discrete input/output module designed for integration with Foxboro I/A Series Distributed Control Systems and Invensys I/A Series platforms. Operating as an FBM10 (Fieldbus Module 10), the DM400YL provides eight channels of 120 VAC voltage monitoring inputs and eight channels of 120 VAC output switching with integrated current overload protection. The module supports expansion capabilities through a single optional expansion module, enabling scalable I/O configurations within distributed control architectures.

Technical Specifications

• Input Channels: 8 × 120 VAC voltage monitoring with transitions occurring between 20 and 79 VAC for OFF-ON and ON-OFF detection


• Output Channels: 8 × 120 VAC switching with current overload protection


• Overload Protection: Automatic retry operation - module opens for 64.5 line cycles and retries indefinitely upon overload detection; overloads exceeding 50 A risk module damage


• Isolation: 1250 VAC withstand capability for one minute between any channel and earth ground, or between any two channels


• Power Supply: 26 to 42 VDC input; 7 W maximum (main module only), 15 W maximum (main module plus expansion module)


• Weight: Approximately 2.00 lbs

Key Features

• LED indicators for module status and per-channel monitoring


• Configurable input filter time on a per-module basis


• Per-channel output configuration options: sustained or momentary operation modes with adjustable pulse output intervals


• Fail-safe configuration and fallback settings for critical safety requirements


• Single expansion module support for increased I/O density

Typical Applications The DM400YL functions as an interface module within Foxboro I/A Series control systems, handling discrete 120 VAC field devices including sensors, switches, solenoids, and contactor coils requiring industrial-grade isolation and overload protection.

Compatibility & Integration The module integrates directly with Foxboro I/A Series and Invensys I/A Series Distributed Control Systems via fieldbus connectivity. It operates as a component within the larger DCS architecture and supports hierarchical expansion through dedicated expansion module interfaces.