# Siemens CSM 127 Industrial Ethernet Switch Module, 4-Port RJ45, 10/100 Mbit/s

**URL:** https://aio.lv/en/product--siemens-6gk72771aa100aa0--3746853
**Data updated:** 2026-05-18 02:44 (EEST)
**Category:** Network Switches
**Manufacturer:** Siemens
**Manufacturer code:** 6GK72771AA100AA0
**EAN:** 4019169854399
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 297.49 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 245.86 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-6gk72771aa100aa0--3746853

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The Siemens CSM 127 is a compact industrial Ethernet switch module designed for SIMATIC S7-1200 systems. It features 4 RJ45 ports supporting Fast Ethernet with data rates of 10/100 Mbit/s. Utilizing 10BASE-T and 100BASE-TX copper cabling technology, this module provides reliable network connectivity for industrial automation environments. Manufactured in Germany, it ensures high performance and durability for demanding control applications.

## Long description

The Siemens CSM 127 is a compact industrial Ethernet switch module specifically engineered for seamless integration with SIMATIC S7-1200 controller systems. This unmanaged switch provides a robust solution for expanding network connectivity in industrial automation environments, allowing for the connection of the S7-1200 CPU and up to three additional Ethernet-enabled devices. With its four RJ45 ports, the module supports reliable data transmission at speeds of 10/100 Mbit/s, ensuring stable communication across your control network.
Advantages
This module offers a space-saving design that mounts directly onto the S7-1200 rail, simplifying installation and reducing cabinet footprint. Its unmanaged nature ensures plug-and-play operation without the need for complex configuration, making it an ideal choice for quick network expansion. The integrated LED diagnostics provide immediate visual feedback on the status of the power supply and individual port activity, facilitating efficient troubleshooting and maintenance in demanding industrial settings.
Suitable for
Expanding Ethernet connectivity for SIMATIC S7-1200 systems
Connecting peripheral devices like HMI panels or remote I/O to the control network
Small-scale industrial automation cells requiring reliable 10/100 Mbit/s communication
Applications where DIN-rail mounting and compact dimensions are essential
When it may not be suitable
This module is not suitable for complex network environments that require managed switch features such as VLAN tagging, port mirroring, or advanced traffic prioritization. It is also not intended for high-speed Gigabit Ethernet applications, as it is strictly limited to 10/100 Mbit/s data rates.
Key specifications
4 x RJ45 ports for Ethernet connection
Data transfer rates of 10/100 Mbit/s
Unmanaged switching technology
External 24 V DC power supply
Integrated LED status diagnostics
Designed for SIMATIC S7-1200 rail mounting
How to use
Installation is performed by mounting the module directly onto the standard DIN rail alongside the S7-1200 CPU. Connect the 24 V DC power supply to the designated terminals on the module. Once powered, connect your Ethernet devices using standard copper cabling to the RJ45 ports. The switch will automatically detect the connection speed and duplex mode of the connected devices, requiring no further software configuration or programming.
What to consider before purchase
Ensure your network architecture does not require managed switch functionality
Verify that your power supply provides a stable 24 V DC output
Confirm that the total number of required Ethernet nodes does not exceed the four available ports
Check that your cabling infrastructure supports 10BASE-T or 100BASE-TX standards
Usage recommendations
For optimal performance and network reliability, always use high-quality shielded Ethernet cables and ensure that the power supply is properly grounded according to the provided electronic equipment manual.

## Specifications

### Other features

| Feature | Value |
|---|---|
| Ethernet LAN (RJ-45) ports | 4 |
| Ethernet interface type | Fast Ethernet |

### Sustainability

| Feature | Value |
|---|---|
| Sustainability compliance | Yes |
| Sustainability certificates | CE, REACH, RoHS, WEEE |

### Network

| Feature | Value |
|---|---|
| Networking standards | IEEE 802.3, IEEE 802.3u |
| Ethernet LAN data rates | 10, 100 |
| Copper ethernet cabling technology | 10BASE-T, 100BASE-TX |

### Logistics data

| Feature | Value |
|---|---|
| Country of origin | Germany |

## FAQ

### How much does the Siemens CSM 127 Industrial Ethernet Switch Module cost, and is it available for purchase?

The price is 297.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 14.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Siemens CSM 127 Industrial Ethernet Switch Module be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Siemens products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Siemens service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: networking standards, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/3746853/47525774_large.webp