Hirschmann OCTOPUS OS20/24 Switch Installation Power Supply

Hirschmann OCTOPUS OS20/OS24 High Protection Switch M12 Connection and PoE Power Deployment Guide

Introduction: Industrial network nodes in harsh environments

In harsh environments such as open-pit mines, tunnel engineering, rail transit vehicles, and ship decks, ordinary industrial switches often fail frequently due to insufficient protection levels (dust, splashing water, condensation). The Hirschmann OCTOPUS OS20/OS24 series managed switches are designed specifically for this type of scenario, featuring a fully sealed metal housing and an overall protection level of IP65/67. They are equipped with M12 circular connectors (D-code) and 7/8 "power interfaces, which can withstand high-pressure water flushing, salt spray, and condensation environments. The series offers 9 100Mbps M12 ports (ports 2-9 of the OS24 model support PoE+and comply with IEEE 802.3at), supporting redundant power supplies (24-48V or 72-110V wide voltage), with operating temperatures covering -40 ° C~+70 ° C, and certified for railways (EN 50155), ships (GL), and vehicles (e1). This article is based on the official installation manual and systematically reviews the model decoding, M12 power and signal contact wiring, waterproof installation, EMC ferrite configuration, and PoE management of OCTOPUS OS20/OS24, providing detailed guidance for engineers on network deployment in harsh environments.

Chapter 1 Product Positioning and Model Decoding

1.1 Unique positioning of OCTOPUS family

The OCTOPUS series complements the Hirschmann Open Rail (RS series) and MICE series: Open Rail is suitable for standard industrial cabinets, MICE is suitable for 19 inch racks, and OCTOPUS is designed for IP65/67 protection requirements scenarios such as outdoor cabinets, train carriage bottoms, port cranes, etc. The difference between OS20 and OS24 lies in their PoE capability: OS20 is a pure data switch (9 100Mbps ports, no PoE), while OS24 provides 8 PoE+ports (ports 2-9) and 1 non PoE port (port 1), with a total PoE power budget of 61.6W.

1.2 Model Code Analysis (Manual Table 2)

Meaning of key positions:

Position 6-7: Number of special ports (000 or 088, where 088 represents 8 PoE+ports)

Position 8-9: Number of 100Mbps ports (099, fixed at 9 100Mbps ports)

Position 12-13: Upstream port type (T5, i.e. M12 D-code twisted pair port)

Position 16: Temperature Range (T=-40 ° C~+70 ° C)

Position 17: Power Characteristics (A=24-48V DC, M12 5-pin); F = 24~48V DC， 7/8 "5-pin; N=72~110V DC, 7/8" 4-pin)

Position 18: Certification (E=UL+along the railway/train; F=UL+railway+GL vessel+e1 vehicle mounted)

Existing models (manual table 2):

OS20-000900T5T5TAFBHH (24V, M12 power supply)

OS20-000900T5T5TNEBHH (110V, 7/8 "power supply)

OS24-080900T5T5TFFBHH (24V, 7/8 "power supply, PoE）

OS24-080900T5T5TNEBHH (110V, 7/8 "power supply, PoE）

Chapter 2 Connection of Power Supply and Signal Contact Points

2.1 Detailed Explanation of Three Power Supply Characteristics

OCTOPUS is divided into three characteristics based on power interface type and voltage level: A, F, and N

Feature A (24-48V DC, M12 5-pin connector):

Input voltage: 9.6~60V DC (rated 24~48V)

Interface: 5-pin M12 A-code (with ELWIKA 5012 PG7 connector included)

The signal contacts are integrated into the same connector (pins 2 and 5 are FAULT)

Buffer time:>10ms

External fuse: 2A slow melting

Feature F (24~48V DC, 7/8 "5-pin connector):

Input voltage: 16.8-60V DC (rated 24-48V)

Interface: 5-pin 7/8 "connector (power specific, pin allocation as shown in Table 8)

Signal contact: Independent 5-pin M12 connector (to be purchased separately)

Need to install ferrite magnetic rings (included) to meet EMC requirements

External fuse: 7A slow melting

Characteristic N (72~110V DC, 7/8 "4-pin connector):

Input voltage: 50.4~138V DC (rated 72~110V)

Interface: 4-pin 7/8 "connector (power specific)

Signal contact: Independent 5-pin M12 connector (to be purchased separately)

External fuse: 2.5A slow melting

2.2 Railway Standard Special Warning (EN 50155)

Critical safety warning: According to EN 50155 clause 5.1.1.1, the nominal voltage of 48V supplied by the train may temporarily exceed the SELV threshold of 60V. Additional measures must be taken to limit the surge voltage to below 60V, or to use a lower nominal voltage. This directly affects on-site wiring and fuse selection.

2.3 Signal Contact (FAULT) Wiring

Feature A: The signal contacts are integrated into a 5-pin M12 power connector (pins 2 and 5)

Feature F/N: The signal contacts need to be wired through independent 5-pin M12 A-code connectors (such as ELWIKA 5012 PG7), with pin assignments shown in Table 6 (pins 2 and 5 are FAULT, others are not used)

Contact electrical parameters: maximum 1A resistive load, maximum 48V DC, SELV.

2.4 Key requirements for waterproof sealing

When using the ELWIKA 5012 PG7 connector, the cable diameter must be between 4mm and 6mm, exceeding this range will damage the IP65/67 sealing. All unused M12 ports and power sockets must be sealed with protective plugs (Attachment 942 057-001/002).

Chapter 3 Mechanical Installation and Grounding

3.1 Installation method and heat dissipation requirements

OCTOPUS equipment adopts a flat installation method and requires 4 M5 screws to be fixed on a flat surface. After drilling the installation holes, fix the equipment on the substrate.

Attention to heat dissipation:

Characteristics A and F: When the ambient temperature exceeds 45 ° C, the equipment must be installed in a cabinet or restricted access area.

Feature F: To ensure that the bottom plate temperature is below 90 ° C, one of the following measures can be taken:

The power supply voltage shall not be less than 20V

The total PoE output is limited to 47W or less

The ambient temperature is limited to below 65 ° C

Installed on a 0.15m ² metal plate (without any other heat source)

3.2 Grounding Requirements

Feature A: Use M3 grounding screw (functional grounding), it is recommended to install a toothed washer to ensure conductivity.

Feature F/N: Use M4 grounding screw (protective grounding) and also require a toothed washer.

The grounding wire diameter shall not be less than the power wire diameter, at least 0.75mm ² (AWG18).

The grounding wire is connected first and disconnected last.

Chapter 4 EMC Ferrite Installation (Special for Feature F)

Feature F model (OS24-080900T5T5TFFBHH) comes with a ferrite magnetic ring, which must be installed on the power input line to ensure EMC compliance:

Thread the power cord through the ferrite three times (repeatedly circling).

Place the ferrite as close as possible to the power input end of the equipment (maximum distance of 50cm).

Lock the ferrite (open/close with the accompanying key).

Purpose: To suppress high-frequency conducted interference on power lines and meet EN 55032 Class A and ship EMC requirements.

Chapter 5: Data Ports and PoE Power Supply

5.1 M12 D-code port characteristics

Connector: 4-pin M12 D-code, with conductivity between the housing and the metal casing of the device.

Support: 10/100BASE-TX, Auto negotiation, Auto crossover, Auto polarity, up to 100m (Cat5e shielded cable).

Pin definitions: 1=TD+, 2=RD+, 3=TD -, 4=RD - (see Table 3), consistent with the standard M12 D-code.

5.2 PoE+power supply (OS24)

Ports 2-9 of OS24 support PoE+(IEEE 802.3at), with a maximum of 30W per port and a total power budget of 61.6W (total output power limit can be configured through management software).

Power supply method: Phantom power supply (signal line pairs simultaneously transmit data and power), Alternative A (1/2 and 3/6 line pairs)

Pin PoE polarity: 1/3=positive Vpse, 2/4=negative Vpse (see Table 4)

Port 1 is a non PoE port: In a ring network structure, it is recommended to connect the PoE port to the non PoE port to avoid potential difference issues.

PoE status LED:

Green constant light=supplying power to PD

Green slow flash (1 time/cycle)=PoE total power exceeds budget

Green flash (3 times/cycle)=PoE disabled in management

Chapter 6 LED Status Diagnosis

6.1 System Status LED

Meaning of LED color

P1/P2 green corresponds to normal power input

FAULT red on=signal contact disconnected (alarm state), off=normal

RM green/yellow ring network manager status (green=active and redundant port closed, yellow=active and redundant port open, flashing=ring network configuration error)

6.2 Port Status LED

Each M12 port is equipped with a dual color LED:

Green constant light=link valid

Green slow flashing (1 time/cycle)=Stand by mode

Green flash (3 times/cycle)=port managed to be closed

Yellow flashing=data transmission and reception

Chapter 7 Initial Configuration and Security Baseline

7.1 IP Address Allocation

DHCP is enabled by default at the factory. If a static IP is required, it can be configured through the following methods:

V. 24 serial port (M12 interface, 9600bps, 8N1) connected to VT100 terminal

HiDiscovery Protocol (via Industrial HiVision tool)

BOOTP/DHCP Option 82

ACA11-M12 AutoConfiguration Adapter

Default voucher:

Read only: user/public

Read and write: admin/private

The password must be changed for the first login (at least 8 characters, including uppercase and lowercase letters, numbers, and special characters).

7.2 Other default parameters

Ring network redundancy: disabled

Port link status monitoring (signal contact): disabled

All ports: Auto negotiation enabled

RSTP: Enable

V. 24 baud rate: 9600

Chapter 8 Environmental Temperature Monitoring and Special Measurement Methods

OCTOPUS provides a calibration method for determining the actual maximum allowable ambient temperature:

Install the equipment at the designated location and turn it on, waiting for the maximum operating temperature to be reached.

Measure the actual ambient temperature (reference value) at a distance of 5cm from the device.

Read the internal temperature displayed by CLI/GUI.

Calculate the temperature difference (internal temperature - reference ambient temperature).

Add this temperature difference to the maximum ambient temperature specified in the manual to obtain the actual maximum allowable ambient temperature for the installation location.

Reason: The internal temperature of the equipment is higher than the ambient temperature (depending on the installation method, heat dissipation conditions, and adjacent equipment thermal radiation), and this method can accurately evaluate whether the on-site installation meets thermal specifications.

Chapter 9 Maintenance and Disassembly

Relay maintenance: The signal relay is a worn part, and the contact resistance should be checked regularly according to the switching frequency.

Firmware update: Regularly visit the Hirschmann official website to download the latest software version.

Sealing inspection: After each rewiring, check whether the connector sealing ring is intact and whether the protective plug is tightened to maintain IP65/67 rating.