Hirschmann MICE MS20/MS30 Switch Integration and Troubleshooting



Hirschmann MICE MS20/MS30 Switch Integration and Troubleshooting Guide

The robustness and availability of network communication equipment directly determine the lifeline of the entire automation system in rail transit, power substations, and harsh industrial manufacturing sites. When old unmanaged switches face replacement due to bandwidth bottlenecks or insufficient environmental tolerance, engineers often need a modular device that can provide high-density ports, achieve millisecond level network redundancy, and comply with strict environmental certifications. The Hirschmann MICE MS20/MS30 series industrial Ethernet switches are professional grade products designed to address communication challenges under extreme conditions.

This article will provide you with a highly practical and in-depth technical guide from the dimensions of modular hardware architecture, redundant power supply and ring network topology, explosion-proof area safety regulations, and common on-site troubleshooting.

Modular hardware architecture and thermal management

The biggest feature of the MICE (Modular Industrial Communication Equipment) series is its modular design with a "building block" approach. Its basic module integrates switching function, management function, redundancy control, display control, and voltage access; The physical interface for connecting to the local area network is provided by pluggable media modules.

Model positioning differences:

MS20: Provides up to 8, 16, or 24 10/100 Mbit/s Ethernet ports to meet medium density access requirements.

MS30: On the basis of MS20, it supports up to 2 additional gigabit (1000 Mbit/s) ports, suitable for backbone networks with high bandwidth uplink requirements.

During on-site installation, heat dissipation management is the first threshold to ensure long-term stable operation of the equipment. The device adopts a fanless design and relies on a metal casing for natural heat dissipation. During installation, standard 35mm DIN rails must be used to ensure that there is at least 10 cm (4 in) of space left above and below the equipment to maintain good air circulation. If multiple high-power devices are densely installed in the control cabinet, it is recommended to add fans or air conditioners inside the cabinet to avoid heat accumulation and accelerated aging of internal components.

Power supply logic and redundancy mechanism: details that cannot be ignored

In industrial sites, the stability of the power supply system directly affects communication. The power supply design of MS20/MS30 is very rigorous, but it is prone to pitfalls when wiring:

SELV/PELV mandatory requirement: Equipment must be connected to Extra Low Voltage (SELV) or Protective Extra Low Voltage (PELV) circuits that comply with IEC 60950-1 or IEC/EN 62368-1 standards. For the North American market, it is necessary to connect a power supply that complies with the National Electrical Code (NEC) Class 2 standard, with a maximum output power limit of 100W.

Dual redundant power supply: The basic module provides two independent 4-pin terminal blocks (or one 6-pin terminal block), supporting dual power supply redundant access. The two inputs are internally decoupled and do not have equal current distribution. When one of the power sources has a high voltage, the equipment is completely powered by that source; Once the circuit loses power, the other circuit seamlessly takes over. If only one power source is connected on site, the equipment will report a "power failure" alarm. To eliminate this alarm, you need to block the event in the management interface or connect both power sources.

Grounding specification: When supplying DC power, only the negative pole (0V) of the voltage input is allowed to be grounded. The bottom panel of the device is grounded through DIN rails, and independent grounding screws can be used for dual grounding protection. If using AC power supply (specific model), it is necessary to ensure that the power supply is isolated from ground potential.

Practical application of redundant ring network and DIP switch configuration

In industrial networks, a single point of disconnection may cause the entire production line to shut down. The MICE series supports redundant ring network technology based on HIPER Ring. The core of the configuration lies in the DIP switch at the bottom of the basic module (4-pin or 3-pin, depending on the model).

RM (Redundancy Manager) switch: Turn the switch to ON to enable the redundancy manager function.

Ring Port switch:

For MS20, the ON state indicates that port 1 of module 1 and port 1 of module 2 are used as ring network connection ports.

For MS30, the ON state indicates that port 1 and port 2 of module 2 are used as ring network connection ports.

Stand by switch: In the dual loop redundant coupling scenario, set this device as a backup coupling node.

When configuring, if the RM indicator light remains green and constantly on, it indicates that the redundancy function is normal; If it shows a constant yellow light, it indicates that the redundant port has been activated (i.e. there is a breakpoint in the ring network and data is being transmitted from the backup path); If it flashes green, it usually means that the HIPER Ring configuration is incorrect (such as the Ethernet cable not being properly connected to the specified port).

Safety specifications for optical ports, PoE, and explosion hazardous areas

1. Compatibility between fiber optic and SFP modules

When long-distance transmission or strong electromagnetic interference environments are required, engineers will choose media modules with SFP slots such as MM4. Hirschmann original SFP transceiver must be used. Mixing third-party modules may result in device failure to recognize or mismatched optical power. In addition, different types of optical ports (such as LH, SX, LX) must not be mixed and must ensure that the wavelength and transmission distance parameters of the optical ports at both ends are completely matched.

2. PoE power supply module (MM22)

If power is required for IP cameras or wireless APs on site, the MM22-T1T1T1T1 PoE module can be used. This module outputs 48V DC voltage through idle line pairs (Pins 4/5 and 7/8). A dedicated external PoE power supply (such as RPS 60/48V EEC) must be used, and the length of the power cable should be less than 3 meters, with a cross-sectional area that meets the carrying requirements of 1.5A current.

3. Special requirements for hazardous locations

For MSxx equipment with ATEX or IECEx certification labels, the following specifications must be strictly followed when used in flammable and explosive gas environments:

The equipment must be installed inside an enclosure that provides at least IP54 protection level.

The USB interface and V.24 interface are only used for temporary connections during maintenance. In areas where explosive gases are known to exist, it is strictly prohibited to connect or disconnect these two interfaces, otherwise it may cause an explosion.

If a relay output (signal contact) is used, the current must be limited to within 100 mA of the resistive load.

The temperature level is T4, and the extended temperature model (T/E) allows operation in an environment of -40 ° C to+70 ° C, but it should be noted that the internal temperature of the equipment may be 20 ° C higher than the ambient temperature.

Common on-site troubleshooting and lifecycle maintenance

Fault 1: The device cannot be powered on, all LEDs are off

Troubleshooting: Check if the wiring of the power supply terminal block is correct (within the range of 18-32V or 18-60V). Use a multimeter to measure the voltage between pins 1 and 2 of the terminal block. Check if the non replaceable fuse at the power input end is blown. If using dual power supply, it is necessary to confirm whether the negative terminals of both power sources are reliably grounded.

Fault 2: Broadcast storm or frequent network disconnection on the network

Troubleshooting: Check the RM settings of the DIP switch. If a physical loop is formed in the network but HIPER Ring is not enabled, or if the ring network port configuration is incorrect, it will cause a broadcast storm. At this point, the RM LED status should be checked and the traffic situation of the port should be viewed using management software such as Industrial HiVision. In addition, check whether the crystal head of the network cable is oxidized and loose, and ensure that the cable shielding layer is correctly grounded.

Fault 3: The light port link light is not on

Troubleshooting: Confirm whether the wavelength and transmission distance of the SFP modules at both ends are consistent. Check if the fiber optic jumper is damaged (use a flashlight to illuminate one end and observe if there is light shining through the other end). Confirm if the fiber end face is clean, as dust and oil stains are common causes of excessive light attenuation. Note that after inserting the SFP module, the corresponding RJ45 electrical port will be automatically disabled, which is a normal phenomenon.

Fault 4: PoE device unable to supply power

Troubleshooting: Confirm if the external 48V PoE power supply is working properly and if the terminal block wiring is secure. Check if the connected PD device complies with the IEEE 802.3af standard (Class 0 or Class 3). Note that there is no electrical isolation between the PoE ports of the MM22 module.

Lifecycle management recommendations:

The front panel of the device is equipped with replaceable label paper. It is recommended that engineers print the module name, MAC address, IP address and other information clearly and insert them into the label slot during debugging to avoid accidentally unplugging cables during later maintenance.

Regularly connect the AutoConfiguration Adapter (ACA) via USB interface to backup device configuration, and follow the firmware updates on Hirschmann's official website for the latest features and security patches.