Woodhead SST-DN4-104-2 DeviceNet Interface Module

Product Details

SST-DN4-104-2 Product Description

The Woodhead SST-DN4-104-2 is a high-performance DeviceNet interface module engineered for seamless integration within distributed industrial control architectures. Designed to operate as a scanner or adapter node on DeviceNet networks, this module delivers deterministic communication, robust signal integrity, and reliable I/O data exchange across multi-vendor automation platforms. Whether deployed in a standalone PLC cabinet or embedded within a multi-rack control system, the SST-DN4-104-2 provides the communication backbone that connects field devices to supervisory control layers with precision and consistency.

In modern industrial automation, the DeviceNet interface is not merely a communication card — it is the structural bridge between the control layer and the device layer. The SST-DN4-104-2 fulfills this role by supporting both master and slave operating modes, enabling flexible topology design across manufacturing cells, process skids, and distributed I/O panels. Its compatibility with standard DeviceNet cabling infrastructure and its support for explicit and I/O messaging make it a versatile component in both greenfield installations and brownfield system upgrades.

From an architecture standpoint, the SST-DN4-104-2 integrates directly with host PLC platforms via a standard ISA or PCI bus interface, depending on the variant configuration. This allows the module to be embedded within the controller chassis, reducing external wiring complexity and improving overall system compactness. The module's onboard memory and configurable node addressing support scalable network expansion without requiring hardware redesign, making it an ideal choice for phased automation rollouts and modular system architectures.

All units are shipped tested and verified, backed by a 12-Month Warranty, and available from in-stock inventory for rapid project deployment.

The SST-DN4-104-2 achieves its full architectural value when deployed as part of a coordinated automation platform. In a typical control cabinet, the module operates alongside a host PLC CPU — such as an Allen-Bradley SLC 5/05 or a ControlLogix L6x processor — providing the DeviceNet scanning function that the native CPU may not support natively. This pairing allows the PLC to offload network management tasks to the SST-DN4-104-2, freeing CPU cycles for real-time ladder logic execution and PID loop processing.

On the power layer, a dedicated 24 VDC DeviceNet network power supply — such as the Belden DNB-100 or equivalent ODVA-compliant supply — provides isolated bus power to the DeviceNet trunk line, ensuring stable voltage delivery to all connected nodes including valve terminals, motor starters, and distributed I/O blocks. The SST-DN4-104-2 monitors network health and can report power anomalies back to the host controller via its diagnostic registers.

At the I/O layer, the module communicates with field devices such as the Turck BL20 DeviceNet I/O station, Phoenix Contact Inline DeviceNet coupler, or Rockwell 1769-SDN compact DeviceNet scanner for auxiliary rack expansion. These devices extend the I/O footprint of the control system without requiring additional PLC racks, reducing hardware costs and cabinet space requirements.

For HMI integration, the SST-DN4-104-2 supports indirect data mapping through the host PLC's data table, allowing FactoryTalk View SE or Wonderware InTouch SCADA systems to visualize DeviceNet node status, fault codes, and I/O values in real time. This transparency across the HMI layer accelerates fault diagnosis and reduces mean time to repair (MTTR) during production incidents.

In redundant architecture designs, the SST-DN4-104-2 can be paired with a secondary scanner module in a hot-standby or parallel scanning configuration, ensuring continuous network operation during primary module maintenance or failure events. This redundancy capability is particularly valuable in continuous process industries where unplanned downtime carries significant financial and safety consequences.

Communication gateway integration is also supported: the SST-DN4-104-2 can coexist in a multi-network cabinet alongside EtherNet/IP gateways such as the ProSoft MVI56-DFNT or the HMS Anybus X-gateway, enabling protocol bridging between DeviceNet field devices and higher-level Ethernet-based supervisory systems. This multi-protocol coexistence is essential in hybrid automation environments where legacy DeviceNet infrastructure must be preserved while migrating supervisory layers to modern Ethernet architectures.

Discrete Manufacturing: In automotive body shop and assembly line applications, the SST-DN4-104-2 manages communication between the line PLC and DeviceNet-connected pneumatic valve manifolds, photoelectric sensors, and servo drive enable signals. Its deterministic scan cycle ensures that I/O state changes are reflected in the PLC data table within the required cycle time, supporting high-speed part transfer and quality inspection sequences.

Power Generation and Utilities: In power plant auxiliary systems and substation automation panels, the SST-DN4-104-2 interfaces with DeviceNet-enabled motor control centers (MCCs) and protection relays, providing the control system with real-time motor status, trip signals, and energy metering data. Its robust operating temperature range and ODVA conformance make it suitable for the demanding electrical environments found in power generation facilities.

Petrochemical and Refining: In process skid automation for pump stations, compressor packages, and heat exchanger control loops, the SST-DN4-104-2 connects field-mounted DeviceNet transmitters and positioners to the DCS or PLC control layer. Its support for explicit messaging enables on-demand parameter reads from smart field devices, supporting advanced process diagnostics and predictive maintenance workflows.

Water and Wastewater Treatment: Municipal water treatment facilities deploy the SST-DN4-104-2 to integrate DeviceNet-connected variable frequency drives (VFDs) on pump motors with the SCADA control system. The module's multi-node scanning capability allows a single interface card to manage the entire pump station network, simplifying cabinet design and reducing commissioning time.

Mining and Mineral Processing: In conveyor drive control systems and crusher automation panels, the SST-DN4-104-2 provides reliable communication between the PLC and DeviceNet-enabled soft starters, overload relays, and belt alignment switches. Its ability to operate in high-vibration and high-dust environments — when properly enclosed — makes it a dependable choice for harsh mining applications.

Q1: Is the SST-DN4-104-2 compatible with both Allen-Bradley and third-party PLC platforms?A: Yes. The SST-DN4-104-2 uses a standard ISA bus interface and is supported by Woodhead's SST configuration software, which is compatible with a wide range of host platforms including Allen-Bradley SLC 500, legacy ControlLogix systems with ISA backplane adapters, and industrial PCs running Windows-based control software. For non-Allen-Bradley platforms, the module's API-level driver support enables integration with Siemens, Mitsubishi, and other PLC environments through custom software development or third-party driver packages.

Q2: What is the recommended approach for replacing an SST-DN4-104-2 in a live production system?A: For planned replacement, export the existing network configuration using the SST Configuration Utility before removing the module. Install the replacement SST-DN4-104-2 in the same ISA slot, restore the configuration file, and perform a network health scan to verify all nodes are communicating correctly before returning the system to production. NANKMOS recommends maintaining one spare unit per active network segment to minimize replacement lead time. All replacement units supplied by NANKMOS are covered under a 12-Month Warranty and are tested prior to shipment.

Q3: How does the SST-DN4-104-2 support long-term maintenance and system lifecycle management?A: The SST-DN4-104-2 provides comprehensive diagnostic registers accessible via the host PLC's data table, including network error counters, node fault flags, bus-off event logs, and communication timeout indicators. These diagnostics enable predictive maintenance workflows by allowing maintenance engineers to identify degrading nodes before they cause production stoppages. NANKMOS maintains in-stock inventory of the SST-DN4-104-2 to support long-term spare parts programs, and all units are supplied with a 12-Month Warranty to provide lifecycle assurance for ongoing automation system maintenance.