Description
Product Introduction
The SAM Electronics SAM 401, part number 271.149.322, is a System Net Adapter Module used in legacy marine automation systems associated with SAM Electronics, Lyngsø Marine, and STN Atlas. GEAMAR 120 ISL installation documentation identifies the SAM 401 as a System Net Adapter Module and lists it among the system’s electronic modules. Its role is to support system-network connectivity between compatible automation components, rather than performing the field signal acquisition functions of digital or analog I/O modules.
For shipboard maintenance, the key issue is preserving compatibility with the existing system architecture. The SAM 401 is a legacy component, and supplier listings show several suffix or revision formats, including /E and -06. Before ordering, compare the installed label, part number, revision, and connector arrangement with the offered unit. Confirm that the replacement is intended for the same GEAMAR or related marine automation configuration. A matching SAM 401 model name alone does not establish compatibility with every system or revision.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product model | SAM 401 |
| Manufacturer / family | SAM Electronics / Lyngsø Marine / STN Atlas |
| STN Atlas part number | 271.149.322 |
| Alternate Lyngsø Marine part number | 962.002.600 |
| Product type | System Net Adapter Module / Dual System Bus Module |
| Primary function | System-network connectivity |
| Associated system | GEAMAR 120 ISL and compatible marine automation installations |
| Supply reference | 24 VDC system |
| Listed supply power consumption | 0 W in the GEAMAR 120 ISL installation table |
| Hardware revision | Verify from the installed module; suffixes vary in supplier listings |
| Weight | Approximately 470 g in one supplier listing |
| Mounting and connectors | Confirm against the module drawing and installed hardware |
Specification note: The available material does not establish a universal connector pinout, operating-temperature range, or network data rate for every SAM 401 revision. Confirm these details using the appropriate system documentation before installation.
SAM401 271.149 322
Application Scenarios and Pain Points
- Marine machinery monitoring: Supports network connectivity between compatible control and monitoring components.
- Engine control and alarm systems: Used within legacy shipboard automation architectures that exchange equipment status and process information.
- GEAMAR 120 ISL maintenance: Serves as a replacement spare for systems using the documented SAM 401 configuration.
- Legacy vessel support: Helps maintain existing installations where changing the network architecture would require wider engineering work.
Common failure and procurement risks include mismatched revisions, incorrect assumptions about the system bus, and a replacement unit that has not been functionally tested. Because this module handles system connectivity, successful power-up alone does not prove that communication with the connected control equipment has been restored.
Related Products
The following modules are documented within the same GEAMAR 120 ISL ecosystem. They are related components, not direct replacements for the SAM 401.
| Model | Function |
|---|---|
| ZM 411 | CPU module |
| SIM 401 | Serial interface module |
| MAM 401 | MIC 40 adapter module |
| SNB 501 | System Net Connection Board |
| DEM 401 | Digital input module |
| DRM 401 | Digital relay output module |
| AEM 402 | Analog input module |
| MXM 401 | Analog multiplexer module |
| MXM 402 | Analog multiplexer module |
| IOM 402 | Input/output module |
Engineer’s Guide: Field Pitfalls to Avoid
1. Match the exact part number and revision. Check whether the original is marked 271.149.322, 271.149.322/E, or another suffix variant. Do not treat the suffix as irrelevant without confirmation.
2. Verify the network architecture before swapping the module. Use the system drawings to identify the correct bus connection and neighboring equipment. Incorrect assumptions about the system net can lead to persistent communication faults.
3. Request functional test evidence for used stock. Ask the supplier to confirm the module’s condition, revision, and test status. Where possible, test communication with the intended system configuration before returning the installation to operational service.
Frequently Asked Questions
Q1: What is the SAM 401 module used for?
The SAM 401 is a System Net Adapter Module used for system-network connectivity in compatible SAM Electronics, Lyngsø Marine, and STN Atlas marine automation installations.
Q2: What is the part number for SAM 401?
The STN Atlas part number is 271.149.322. The associated Lyngsø Marine number is 962.002.600. Confirm any suffix or revision shown on the installed unit.
Q3: Is SAM 401 the same as a serial interface module?
No. GEAMAR 120 ISL documentation identifies the SAM 401 as the System Net Adapter Module and the SIM 401 as the Serial Interface Module. They perform different functions.
Q4: Which systems use the SAM 401?
Available documentation identifies it within the GEAMAR 120 ISL integrated monitoring and control system. Confirm the exact system configuration before using it as a replacement.
Q5: Why is the documented 24 VDC power consumption listed as zero?
The GEAMAR 120 ISL installation table lists 0 W for the SAM 401. This should be treated as a system-specific documented figure, not as proof that every revision has no electrical requirements under all conditions.
Q6: Can a SAM 401/E replace a SAM 401 without a suffix?
Do not assume that it can. Compare the revision, part number, connector layout, and system documentation. The suffix may indicate a relevant configuration or revision difference.
Q7: What should be checked when purchasing a refurbished SAM 401?
Request clear photographs of the label, confirmation of part number and revision, condition disclosure, and evidence of functional testing. Also verify that the supplier can support the required system compatibility checks.
