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SA371-3G
SA371-3G
SA371-3G

NORIS SA371-3G CPU Card Marine Control Module

  • Model: SA371-3G
  • Brand: NORIS (Noris Tachometerwerk)
  • Series: NORIMOS 1000 / NORIMOS 2000
  • Core Function: Central processing for monitoring system
  • Product Type: CPU / Processor Card (Plug-in PCB)
  • Key Specs: Rack-mounted CPU card; proprietary NORIS bus; marine automation system
  • ⚠️ Obsolete Model – Limited Stock Available
  • Condition: New Surplus / Used (depending on batch)
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Description

3. Key Technical Specifications

  • Module Type: Processor (CPU) card
  • System Compatibility: NORIMOS 1000 and NORIMOS 2000
  • Architecture: Plug-in PCB for rack system
  • Function: Central logic processing and system coordination
  • Part Variants: SA371-3G, SA371-3G-SW, SA371-3G-xxxx
  • Communication: Proprietary NORIS backplane bus
  • Application: Marine engine monitoring and alarm systems
  • Mounting: NORIMOS rack slot (dedicated CPU slot)
  • Power Supply: Backplane-fed (typically 24 V DC system)
  • Weight: ~1 kg class module
  • Programming: Factory-configured logic (non-user-programmable in modern PLC sense)
  • Operating Environment: Marine-certified installations (engine room panels)
SA371-3G
SA371-3G

 

4. Product Introduction

The NORIS SA371-3G is a processor card used as the central control unit in NORIMOS 1000 and 2000 marine monitoring systems. It executes system logic, manages alarm handling, and coordinates communication between I/O modules across the rack.

In practice, this module is critical—if it fails, the entire monitoring system goes blind. Engineers typically source this unit for like-for-like replacement in legacy vessels where a full migration to modern PLC/DCS platforms is not feasible.

 

5. Installation & Configuration Guide

Stage 1: Pre-Installation Preparation (10–15 min)

  • ⚠️ Safety First:
    • Inform engine control room
    • Shut down monitoring system
    • Isolate 24 V DC supply
    • Lock out/tag out
    • Wait minimum 5 minutes
  • Tools Required:
    • ESD wrist strap
    • PH1 screwdriver
    • Multimeter (Fluke 115 recommended)
    • Wire labels
    • Smartphone (for documentation)
  • Data Backup:
    • Photograph full rack layout
    • Document module slot positions
    • Record alarm behavior (this CPU defines logic)

Stage 2: Removing the Old Module (5–10 min)

  1. Open control cabinet
  2. Identify CPU slot (usually centrally located in rack)
  3. Label adjacent modules for reference
  4. Release locking mechanism
  5. Pull CPU card straight out
  • ⚠️ Note:
    Do NOT mix up slots — NORIMOS racks are not forgiving if modules are reinserted incorrectly

Stage 3: Installing the New Module (10 min)

  1. Wear ESD protection
  2. Confirm exact model (SA371-3G vs variants)
  3. Insert module firmly into rack
  4. Ensure full seating into backplane
  5. Secure locking tabs
  • Self-Checklist:
    • Correct slot used
    • Module fully seated
    • No bent pins

Stage 4: Power-On & Testing (15–20 min)

  • Pre-Power Check:
    • Measure 24 V DC rail stability
  • Power-On Steps:
    1. Energize system
    2. Observe system startup behavior
    3. Verify alarm panel initialization
    4. Confirm communication with I/O cards
  • ⚠️ Troubleshooting Note:
    • No system response → CPU not recognized (check seating)
    • Partial alarms → mismatch with I/O modules
    • Random faults → suspect aging capacitors or rack issues

 

6. Frequently Asked Questions (FAQ)

Q1: Can I hot-swap the SA371-3G CPU card?
No. This is not a modern hot-swappable architecture. Pulling it live can corrupt the system or damage the backplane.

Q2: Is this module obsolete?
Yes. Fully obsolete. You’re dealing with secondary market inventory only—either new surplus or salvaged units from decommissioned vessels.

Q3: Is there a direct replacement?
No direct drop-in. If this fails and no spare is available, you’re looking at a full retrofit to a modern control system (ABB, Siemens, or similar). That’s a project, not a repair.

Q4: Does this CPU store program logic?
Yes—but not in the PLC sense. The logic is embedded and system-specific. You don’t “download” programs like Siemens Step7. Replacement must match system configuration exactly.

Q5: Why do prices vary so much?
Supply chain reality. These units typically range from ~1,200 to 1,700 depending on condition and availability.
A tested unit with fast shipping is always priced higher.

Q6: What’s the most common failure mode?
Aging electronics—primarily capacitors and thermal stress. I’ve seen units pass power-up but fail after 2–3 hours under load.

Q7: Should I keep a spare onboard?
Absolutely. If your vessel still runs NORIMOS, not having a spare CPU is a risk. Lead time isn’t predictable, and downtime offshore is expensive.

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