100-DNY42R | Allen-Bradley | Distributed Starter System

The 100-DNY42R is a DeviceNet Starter Auxiliary Module designed for distributed motor control applications in industrial automation systems. It is part of Allen-Bradley’s Distributed Starter System (DSA) and is intended to interface motor starters with a control system over a DeviceNet network. The module features 4 digital inputs at 24V DC and 2 relay outputs rated up to 250V AC or DC. This configuration enables localized control and feedback for starter operations directly from the network. Its compact design and robust construction make it suitable for panel-mounted installations in harsh industrial environments. It is commonly used in applications that require modular, networked starter configurations.

The 100-DNY42R uses the DeviceNet protocol, a robust and widely adopted industrial fieldbus developed for Allen-Bradley control systems. DeviceNet allows the module to communicate with PLCs and HMIs using a single network cable for power and data. It supports I/O messaging and configuration data transfer over a CAN-based physical layer. Through DeviceNet, the 100-DNY42R can report status changes, receive control commands, and participate in network-based diagnostics. Integration is performed via EDS (Electronic Data Sheet) files in RSNetWorx or Studio 5000 environments. The use of DeviceNet makes it compatible with existing legacy networks and simplifies modular system expansion.

The input channels on the 100-DNY42R are rated for 24V DC operation. This standard industrial control voltage ensures compatibility with a wide range of field sensors and pushbuttons. Input filtering and isolation help prevent false signals due to electrical noise or transient spikes. The power supply for DeviceNet communication may also use 24V DC, depending on the system configuration. Users should ensure that all connected devices share the same reference potential to avoid grounding issues. Proper wiring practices and shielding improve reliability in noisy environments.

The 100-DNY42R is designed for easy integration into motor starter assemblies and control panels. It can be mounted on DIN rails or flat-panel surfaces, depending on the enclosure and layout. Terminal blocks provide quick-connect access to inputs, outputs, and DeviceNet wiring. Panel mounting typically requires screws or snap-in brackets for vibration resistance. Its compact size and modular design allow it to be positioned close to contactors or overload relays. Proper spacing and airflow should be maintained to ensure thermal performance.

The 100-DNY42R includes two relay outputs capable of switching voltages up to 250V, either AC or DC. These electromechanical relays are designed for general-purpose control of actuators, indicator lights, or contactors. Each output is electrically isolated and protected to handle transient voltages. Relay outputs are especially useful in systems where high-current or high-voltage loads must be controlled directly. The module's relays support long operational life under rated conditions. Control logic for output actuation can be implemented locally via DeviceLogix or remotely from a PLC.