STEINSOHN (Stein Sohn) Automation SMU – Substation Management Unit, Interschalt Maritime Systems

Product Information

Manufacturer	Steinsohn (H.M. Stein Sohn) Automation – a brand of INTERSCHALT maritime systems (Germany)
Model	SMU
Product type	Substation Management Unit
Type No. (label)	Partially legible – reads approximately F893011A. The SMU type commonly known on the market is F803001A; please compare with your unit's label (Not verified).
Serial No.	Handwritten on label – not clearly visible in the supplied photograph
Test date (label)	06/2015
Power supply	24 VDC +30% / -25%
Interfaces	LAN 1, LAN 2 (100 Mbit), hys0–hys5 (6 × 9-pin D-sub serial ports), VGA, USB 1 & 2
Settings	Address-H and Address-L rotary address switches
Indicators	Power, Run, Standby, Stop, Failure LEDs + "Status Information" display
Country of manufacture	Germany (as listed by market sources – not marked on the photo)
Condition	Refurbished (subject to confirmation)

Product Introduction

The Steinsohn (Stein Sohn) Automation SMU – Substation Management Unit is the computer/controller module of a ship's distributed alarm, monitoring and control system built by Stein Sohn, a brand of INTERSCHALT maritime systems. It manages a substation (outstation) of the automation network: it collects data from I/O modules through its serial ports and passes it to the operator stations over the LAN.

SM MARINE SERVICE™ (https://www.smmarineservice.com/) supplies Stein Sohn / Interschalt SMU units and related automation spare parts to ships and repair yards worldwide.

What Is This Equipment?

Large ship automation systems are divided into "substations" placed close to the machinery – engine room, switchboard, pump room, reefer areas. Each substation has an SMU that acts as its local manager. The SMU communicates with the I/O modules (digital inputs, analog inputs and outputs) on its serial buses hys0–hys5, checks their status, and forwards alarms and values over redundant LAN 1 / LAN 2 to the alarm monitoring and power management workstations. The rotary Address-H / Address-L switches give each SMU its unique station address in the network.

Market sources list the same unit under the names Stein Sohn, Steinsohn Automation, Interschalt and Vista Automation, used in alarm monitoring and power management systems.

Main Features

• Substation controller for distributed marine alarm monitoring and control systems
• Dual LAN ports (LAN 1 / LAN 2, 100 Mbit) for redundant network communication
• Six serial interface ports hys0–hys5 for I/O module buses
• Rotary Address-H / Address-L switches for station addressing
• Power, Run, Standby, Stop and Failure LEDs plus Status Information display
• VGA and 2 × USB for service and diagnostics
• Wide-range 24 VDC supply (+30% / -25%) via plug-in terminal (24V / 0V / PE)
• Robust stainless front plate for panel or cabinet mounting

Steinsohn (Stein Sohn) Automation SMU – Substation Management Unit, a brand of INTERSCHALT maritime systems

Main Technical Specifications

Supply voltage	24 VDC, +30% / -25%
Power terminal	3-pole plug: 24V / 0V / PE
Network	2 × Ethernet RJ45, 100 Mbit (LAN 1, LAN 2)
Serial ports	6 × 9-pin D-sub (hys0 – hys5)
Service ports	VGA, USB 1, USB 2
Addressing	Address-H and Address-L rotary switches
Status	Power, Run, Standby, Stop, Failure LEDs; Status Information display
Weight	Approx. 1.26–1.27 kg (market listings)
Known versions	Rev 0.0, 0.2, 0.6; "SMU 2-1 Main", "SMU 2.2 Main" (market listings, Not verified)

Inside the Unit: PCBs, Modules & Part Numbers

Stein Sohn / Interschalt do not publish an internal parts list for the SMU, and no internal PCB part numbers were found in public sources. The assemblies below are described by function from the front-panel interfaces; part numbers are Not verified. Send us photos of the internal board labels for exact identification.

CPU / Main Processor Board

Runs the substation software, handles VGA and USB, and stores configuration. Part number: Not verified.

Serial Interface Board (hys0–hys5)

Provides the six serial buses to the I/O modules. Part number: Not verified.

Ethernet / LAN Interface

Dual 100 Mbit ports for redundant communication to operator stations. Part number: Not verified.

Power Supply Board (24 VDC)

Converts the 24 VDC supply for the internal electronics. Part number: Not verified.

Status Display & LED Board

Drives the Status Information display and the five status LEDs. Part number: Not verified.

Main Components & Related Units

• SMU – Substation Management Unit, type F803001A (market listing) – this product
• DCI24 – Stein Sohn Digital Contact Input Module
• F101003A – Stein Sohn Automation Analog Input Module
• BD01001A – Stein Sohn Reefer Container Monitoring System
• Operator stations / alarm monitoring PCs and power management system panels (models not verified)

Marine & Industrial Applications

• Engine room alarm monitoring and control systems
• Power management systems (PMS) and switchboard monitoring
• Reefer container monitoring on container ships
• Tank, pump and auxiliary machinery monitoring
• Replacement of a failed SMU in an existing Stein Sohn / Interschalt installation

SMU front panel: LAN 1/2, hys0–hys5 serial ports, Address-H/L switches, status LEDs, VGA, USB and 24 VDC supply

Common Problems & Troubleshooting

Safety: the SMU is part of the ship's alarm and control system. Inform the chief engineer and make sure monitoring is covered before switching it off. Switch off the 24 VDC supply before plugging or unplugging connectors, and use ESD protection when handling the unit.

• Failure LED on: check the Status Information display and the alarm list on the operator station; check supply voltage at the 24V/0V terminals.
• No Power LED: check the 24 VDC feed, fuse and the plug terminal.
• Substation communication lost: check LAN 1 / LAN 2 cables, switch ports and link LEDs.
• I/O module values missing: check the related hys port cable and connector and the I/O module power.
• After replacement no communication: make sure Address-H / Address-L are set exactly as on the old unit, and the software/configuration matches.

Maintenance Tips

• Note the Address-H / Address-L settings and cable positions before removing the unit
• Keep connectors tight and free of corrosion; check D-sub screws
• Keep the cabinet clean, dry and ventilated
• Check 24 VDC supply stability regularly
• Keep a tested spare SMU onboard for critical alarm systems

Spare Parts & Replacement Availability

SM MARINE SERVICE™ supplies Stein Sohn / Interschalt SMU units and related I/O modules. For a quotation, please send:

• Photo of the SMU label (Type number, serial number, revision)
• System name and vessel / shipyard details
• Fault description or LED/display status
• Required quantity, port and delivery date

We ship worldwide, subject to availability confirmation.

Why This Equipment Is Still Used

Stein Sohn / Interschalt automation systems are installed on many vessels in service. Replacing the whole alarm system is costly and needs class approval, so ship owners keep these systems running by replacing individual units such as the SMU with tested compatible spares.

FAQ

What is the Stein Sohn SMU?
It is the Substation Management Unit – the controller of one substation in a Stein Sohn / Interschalt ship automation system.

What is the type number F803001A?
It is the SMU type number used in market listings. The label on this unit is partly legible; please compare with your own label.

What power does the SMU need?
24 VDC, +30% / -25%.

What are the hys0–hys5 ports?
Six serial ports for communication with the substation's I/O modules.

Why are there two LAN ports?
For redundant network connection (LAN 1 / LAN 2) to the operator stations.

What do the Address-H and Address-L switches do?
They set the station address of the SMU in the network and must match the old unit when replacing.

Do you have the internal PCB numbers of the SMU?
They are not published. Send photos of the board labels and we will match them.

Which other Stein Sohn modules do you supply?
Related items include DCI24 digital contact input modules, F101003A analog input modules and BD01001A reefer monitoring units, subject to availability.

Is the SMU the same as Vista Automation SMU?
Market listings describe the same unit under Stein Sohn, Interschalt and Vista Automation names. Confirm with the label.

Is this unit refurbished?
Yes, this listing is refurbished; condition and stock are subject to confirmation.

Do you ship worldwide?
Yes, SM MARINE SERVICE™ ships worldwide from Bangladesh and China.

Short Product Description

Steinsohn (Stein Sohn) Automation SMU – Substation Management Unit, a brand of INTERSCHALT maritime systems, for marine alarm monitoring, control and power management systems. The SMU manages one substation of the ship's automation network, communicating with I/O modules over six serial ports (hys0–hys5) and with operator stations over redundant LAN 1 / LAN 2. It features Address-H/L switches, Power/Run/Standby/Stop/Failure LEDs, a status display, VGA and USB service ports and a 24 VDC (+30%/-25%) supply. Label test date 06/2015. Supplied refurbished by SM MARINE SERVICE™, Chattogram, Bangladesh, with worldwide shipping.

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SM MARINE SERVICE™ – Marine Automation & Navigation Equipment Supplier

Available Equipment Conditions: New • Used • Refurbished • Reconditioned (Specific product condition and availability are subject to confirmation.)

Stock Locations: Bangladesh • China

Services: Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing

Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh

Mobile / WhatsApp / Viber: +88 01818 929292

Email: info@smmarineservice.com

Website: https://www.smmarineservice.com/

Need a Stein Sohn SMU or any Interschalt automation spare? Send us your label photo today for a fast quotation.

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