Moxa IMC-21A-M-ST Industrial Grade ST Interface Media Converter

The Moxa IMC-21A-M-ST industrial-grade ST interface media converter is a robust solution designed to bridge the gap between different network media types in demanding industrial environments. This device offers reliable conversion from copper Ethernet to ST-terminated fiber optic connections, ensuring data integrity and extended transmission distances essential for industrial automation and control systems. Key advantages include its rugged industrial design, wide operating temperature range, and support for critical network protocols.

Product Specifications

| Feature               | Specification                                  |

| :-------------------- | :--------------------------------------------- |

| Model                 | IMC-21A-M-ST                                   |

| Ethernet Port         | 1 x 10/100BaseT(X) (RJ45)                       |

| Fiber Port            | 1 x 100BaseFX (ST Connector)                   |

| Fiber Wavelength      | 1310 nm                                        |

| Fiber Distance        | Up to 2 km                                     |

| Power Input           | 12/24/48 VDC (9.6 to 60 VDC)                   |

| Operating Temperature | -40 to 75°C (-40 to 167°F)                     |

| Mounting              | DIN-Rail, Wall-mount                           |

| Dimensions            | 33 x 115 x 105 mm (1.3 x 4.53 x 4.13 in)         |

| IP Protection         | IP30                                           |

| Protocols Supported   | IEEE 802.3, 802.3u, 802.3x, 802.3 10/100BaseT(X), 100BaseFX |

Core Features & Market Positioning

The Moxa IMC-21A-M-ST distinguishes itself through its industrial-grade construction, enabling reliable operation in harsh conditions where commercial-grade converters would fail. Its ability to convert standard Ethernet to fiber optic communication using ST connectors is crucial for extending network reach beyond the limitations of copper cabling, offering immunity to electromagnetic interference (EMI) and electrical noise. This makes it a preferred choice for applications requiring high network uptime and data security, positioning it as a dependable solution for critical infrastructure. The wide DC power input range further enhances its flexibility in various power sourcing scenarios common in industrial settings.

Key Application Scenarios

This media converter is exceptionally well-suited for extending Ethernet networks in environments such as manufacturing plants, substations, transportation systems, and process control facilities. Its primary function is to connect remote devices or segments equipped with RJ45 Ethernet ports to a fiber optic backbone, enabling communication over longer distances and in environments with significant electrical interference. Specific use cases include connecting Programmable Logic Controllers (PLCs), Human-Machine Interfaces (HMIs), remote I/O modules, and security cameras to a central control system, ensuring reliable data acquisition and command transmission.

Practical System Integration Guidance

Integrating the Moxa IMC-21A-M-ST into an existing network is straightforward. Installation typically involves mounting the unit via DIN-rail or wall-mount brackets. Connect the copper Ethernet device to the RJ45 port using standard Cat5e/Cat6 patch cables. The fiber optic side requires a duplex multimode fiber optic cable with ST connectors, ensuring proper polarity. Power is supplied via screw terminals, accepting a wide range of DC voltages from 9.6V to 60V, making it compatible with most industrial power supplies. Auto-negotiation at both the Ethernet and fiber interfaces simplifies setup, minimizing the need for complex configuration.

Operation and Risk Mitigation

The IMC-21A-M-ST operates as a plug-and-play device, requiring no software configuration for basic media conversion. It automatically detects the network speed and duplex mode for the copper port and negotiates with the connected fiber optic device. Fault detection is typically indicated by LED status lights on the front panel, providing immediate visual feedback on link status and power. To mitigate risks, ensure proper power supply voltage and polarity are used, and protect the unit from excessive dust or moisture, despite its IP30 rating. Regular inspection of fiber optic connectors for cleanliness and damage will prevent signal degradation.

Scalability & Long-Term Value

The Moxa IMC-21A-M-ST offers significant long-term value by providing a cost-effective method to upgrade legacy copper networks to fiber optic infrastructure without replacing existing Ethernet devices. Its robust design ensures longevity in demanding industrial environments, reducing the total cost of ownership. While this specific model is a standalone media converter, its integration into a broader Moxa networking solution allows for a scalable infrastructure. Future expansion can involve adding more fiber optic segments or upgrading to higher-bandwidth fiber standards by introducing compatible switches or other Moxa devices that support advanced industrial networking protocols and the Industrial Internet of Things (IIoT).

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Frequently Asked Questions

What is the maximum distance for the fiber optic connection on the Moxa IMC-21A-M-ST?

The IMC-21A-M-ST supports transmissions up to 2 kilometers over multimode fiber optic cable. This extended reach is crucial for connecting devices across large industrial facilities or campuses. It allows for reliable data transfer where copper Ethernet would be impractical due to distance limitations.

This media converter is designed for industrial applications requiring robust connectivity. It effectively bridges the gap between copper Ethernet devices and fiber optic networks. The 2km limit is suitable for many factory floor or substation deployments.

Ensure that the fiber optic cable and connectors used are rated for the specified distance and are in good condition. Proper installation practices are key to achieving the maximum transmission range and signal integrity.

Can the Moxa IMC-21A-M-ST handle 1000 Mbps Ethernet speeds?

No, the Moxa IMC-21A-M-ST is designed for 10/100 Mbps Ethernet speeds on its copper port. It is an Fast Ethernet media converter, not a Gigabit Ethernet device. For 1000 Mbps connections, a different model would be required.

This limitation means it is best suited for applications where the network bandwidth requirement does not exceed 100 Mbps. It is highly effective for control systems, sensor data, and other applications that do not demand higher speeds.

Always verify the speed requirements of your connected devices and the overall network to ensure compatibility. Using this converter for Gigabit traffic will result in performance issues or complete communication failure.

What type of fiber optic connector does the Moxa IMC-21A-M-ST use?

The Moxa IMC-21A-M-ST utilizes an ST connector for its fiber optic interface. ST connectors are a common type of fiber optic connector known for their bayonet-style coupling mechanism. This ensures a secure and reliable physical connection.

This specific connector type means you will need fiber optic patch cables terminated with ST connectors on one end. Ensure compatibility with other network equipment you may be connecting. The ST connector offers good durability for industrial use.

When connecting fiber optic cables, always ensure the ST connectors are clean and free from dust or debris to maintain optimal signal quality. Improperly cleaned connectors can lead to signal loss or intermittent connectivity.

What is the power input requirement for the Moxa IMC-21A-M-ST?

The IMC-21A-M-ST supports a wide DC power input range from 9.6 VDC to 60 VDC. This flexibility allows it to be powered by various industrial power sources, including 12 VDC, 24 VDC, and 48 VDC systems. This broad compatibility simplifies integration into existing power infrastructure.

The wide voltage input range is a significant advantage in industrial settings where power fluctuations can occur or where only certain voltage levels are readily available. It enhances the reliability and deployment options of the device. Proper wiring to the terminal block is essential.

It is critical to confirm the voltage of your power supply before connecting it to the IMC-21A-M-ST. Connecting an incorrect voltage could damage the device. The unit includes reverse polarity protection for added safety.

Is the Moxa IMC-21A-M-ST suitable for hazardous locations?

No, the Moxa IMC-21A-M-ST is designed for general industrial environments and has an IP30 protection rating. It is not certified for use in hazardous or explosive locations (e.g., ATEX or Class/Zone rated areas). For such environments, specialized intrinsically safe or explosion-proof equipment is required.

Using this media converter in a hazardous location could pose a safety risk and violate industrial safety regulations. It is essential to select equipment that is specifically rated and certified for the environmental conditions of the installation site. Always consult safety standards.

Always verify the environmental specifications and certifications of any industrial equipment before deployment. The IP30 rating indicates protection against solid objects greater than 2.5mm and no protection against water.

What is the operating temperature range of this media converter?

The Moxa IMC-21A-M-ST boasts a wide operating temperature range of -40°C to 75°C (-40°F to 167°F). This extended range makes it highly suitable for deployment in extreme thermal conditions, such as unconditioned enclosures or outdoor cabinets in various climates. This ensures reliable performance regardless of ambient temperature.

This wide temperature tolerance is a key feature for industrial-grade equipment, differentiating it from consumer electronics that would fail under such stress. It guarantees consistent network operation in demanding manufacturing floors, oil and gas facilities, or utility substations.

When installing, ensure adequate ventilation, even within its wide operating range, to maintain optimal performance and longevity. Avoid direct sunlight or heat sources that could push the device beyond its rated limits.

Does the IMC-21A-M-ST support Jumbo Frames?

The specifications for the Moxa IMC-21A-M-ST do not explicitly mention support for Jumbo Frames. Typically, media converters operate at Layer 1 or Layer 2 and may not have advanced frame handling capabilities like switches. It is designed for standard Ethernet frame sizes.

For applications that rely heavily on Jumbo Frames for network efficiency, it's advisable to use managed switches that explicitly support these larger frame sizes. Using this media converter in such a scenario might lead to fragmentation or dropped packets.

It is best to test with your specific application and network configuration if Jumbo Frame support is critical. However, based on its designation as a simple media converter, it's unlikely to offer native support for frames larger than the standard 1518 bytes.

How do I connect two Moxa IMC-21A-M-ST converters to extend a network?

To extend a network using two IMC-21A-M-ST converters, connect the RJ45 port of the first converter to your Ethernet switch or device. Then, connect the ST fiber port of the first converter to the ST fiber port of the second converter using a fiber optic cable. Finally, connect the RJ45 port of the second converter to your remote Ethernet device or switch.

This setup effectively creates a fiber optic link between two points, allowing you to bridge longer distances or overcome electrical noise issues. Each converter handles the media conversion at its respective end of the fiber optic segment. Ensure the fiber cable is properly terminated with ST connectors.

Verify the fiber optic cable polarity if you encounter communication issues. Most industrial fiber links follow a standard transmit-to-receive and receive-to-transmit configuration. The LED indicators on the converters will help diagnose link status.

What are the LED indicators on the Moxa IMC-21A-M-ST used for?

The IMC-21A-M-ST features several LED indicators to provide diagnostic information about the device's status. Typically, there will be LEDs for Power (PWR), indicating if the unit is receiving power, and Link/Activity (LNK/ACT) LEDs for both the Ethernet (RJ45) and Fiber (FX) ports, showing connection status and data transmission.

The PWR LED should be lit steadily if the unit is powered correctly. The LNK/ACT LEDs will illuminate solid when a valid link is established on that port and will flash to indicate network traffic activity. Understanding these lights is crucial for troubleshooting connectivity issues.

If a LNK LED is not lit, it suggests a problem with the cable connection, the connected device, or the fiber optic link. If LNK is solid but ACT is not flashing during data transmission, it might indicate a configuration issue or a lack of data flow.

What is the warranty period for the Moxa IMC-21A-M-ST?

Moxa typically offers a generous warranty period for its industrial networking products, often around 5 years. However, it is always best to confirm the exact warranty terms directly with Moxa or your authorized distributor for the most up-to-date information. Product warranties can sometimes vary by region or specific product revisions.

This extended warranty underscores Moxa's confidence in the reliability and durability of their industrial-grade equipment. It provides customers with peace of mind and protection against manufacturing defects, reducing the risk associated with long-term industrial deployments.

When making a purchase, inquire about the warranty details and any associated support services. Understanding the warranty coverage and claim process can be beneficial should any issues arise during the product's lifecycle.