6GK7277-1AA10-0AA0 Siemens CSM 1277 Compact Switch Module

 78.75 183.33

  • 6GK7277-1AA10-0AA0
  • Compact Switch Module CSM 1277 connection SIMATIC S7-1200 and up to 3 further Industrial Ethernet users with 10/100 Mbits/s unmanaged switch
  • 4 x RJ45 ports
  • External 24 V DC voltage supply
  • LED diagnostics
  • S7-1200 module incl. electronic device manual on CD

Compact Switch Module Siemens CSM 1277 – 6GK7277-1AA10-0AA0


  • Unmanaged switch for connecting a SIMATIC S7-1200 to an Industrial Ethernet network with a line, tree or star topology
  • Multiplication of Ethernet interfaces on a SIMATIC S7-1200 for additional connection of up to three programming devices, operator controls, and further Ethernet nodes
  • Simple, space-saving mounting on the SIMATIC S7-1200 DIN rail
  • Low-cost solution for implementing small, local Ethernet networks
  • Connection without any problems using RJ45 standard plug connectors
  • Simple and fast status display via LEDs on the device
  • Integral autocrossover function permits use of uncrossed connecting cables


  • Savings on installation costs and space compared to using an external network component
  • Fast commissioning, as no configuration is necessary
  • Flexible expansion of the network by simply inserting the CSM


The CSM 1277 is an Industrial Ethernet switch of compact design for use in the SIMATIC S7-1200. The CSM 1277 can be used to multiply the Ethernet interface of the SIMATIC S7-1200 for simultaneous communication with operator panels, programming devices, other controllers, or the office world.

The CSM 1277 and the SIMATIC S7-1200 controller can be used to implement simple automation networks at low cost.


The CSM 1277 compact switch module offers all advantages of the SIMATIC S7-1200 design:

  • Compact design;
    the rugged plastic enclosure contains:

    • 4 x RJ45 ports for connecting to Industrial Ethernet
    • 3-pole plug-in terminal strip for connection of the external 24 V DC supply on the top
    • LEDs for diagnostics and for status display of the Industrial Ethernet ports
  • Simple mounting on the mounting rail of the S7-1200
  • Fanless and consequently low-maintenance design
  • The module can be replaced without using a programming device


  • Multiplication of Ethernet interfaces of the SIMATIC S7-1200
  • Design of a small, local Industrial Ethernet network with three further nodes
  • Automatic detection of data transfer rate by means of autosensing and autocrossover functions
  • LEDs for diagnostics and for status display

Network topology and network configuration

Various network topologies can be implemented using the CSM 1277 compact switch module:

  • Connection of SIMATIC S7-1200 in linear topology:
    at least one RJ45 connection of the SIMATIC S7-1200 remains vacant, e.g. for connecting a programming device (PG)
  • Connection of SIMATIC S7-1200 to a higher-level network in a tree/star topology:
    at least two RJ45 connections of the SIMATIC S7-1200 remain vacant, e.g. for connecting a programming device/operator panel (PG/OP)
  • Design of a small, local network with a SIMATIC S7-1200 and three further Ethernet nodes


The CSM 1277 compact switch module is an unmanaged switch and need not be configured.


The following information is displayed on LEDs on the device:

  • Power
  • Port status
  • Data traffic

Linear topology with CSM 1277

Technical specifications

More information

Selection tool:

To support the selection of SCALANCE network components, the TIA selection tool is available at:


Compact Switch Module CSM 1277 for connecting SIMATIC S7-1200 and up to 3 further nodes to Industrial Ethernet with 10/100 Mbit/s; unmanaged switch, 4 RJ45 ports, ext. 24 V DC power supply LED diagnostics, S7-1200 module incl. electronic Equipment Manual on CD-ROM


DataSheet in PDF

Weight 0.225 kg
Dimensions 1.00 × 1.00 × 1.00 mm


product type designation


transfer rate

10 Mbit/s, 100 Mbit/s

● for network components or terminal equipment


number of 100 Mbit/s SC ports

number of 1000 Mbit/s LC ports

● for multimode


● for single mode (LD)


number of electrical connections

type of electrical connection

● for power supply

3-pole terminal block

type of voltage / 1 / of the supply voltage


● power loss [W] / 1 / rated value

1.6 W

● supply voltage / 1 / rated value

19.2 … 28.8 V

● consumed current / 1 / maximum

0.07 A

● type of electrical connection / 1 / for power supply

3-pole terminal block

● product component / 1 / fusing at power supply input


ambient temperature

● during operation

0 … 60 °C

● during storage

-40 … +70 °C

● during transport

-40 … +70 °C

relative humidity

● at 25 °C / without condensation / during operation / maximum

95 %

protection class IP



SIMATIC S7-1200 device design

fastening method

● 35 mm top hat DIN rail mounting


● wall mounting


● S7-300 rail mounting


● S7-1500 rail mounting


● multiport mirroring


product function / switch-managed


product function

● Parallel Redundancy Protocol (PRP)/operation in the PRP-network


● Parallel Redundancy Protocol (PRP)/Redundant Network Access (RNA)



● for FM

FM3611: Class 1, Divison 2, Group A, B, C, D / T.., CL.1, Zone 2, GP. IIC, T.. Ta

● for safety / from CSA and UL

UL 508, CSA C22.2 No. 142

● for emitted interference

EN 61000-6-4 (Class A)

● for interference immunity

EN 61000-6-2


273 y

reference code

● acc. to IEC 81346-2


● according to IEC 81346-2:2019


certificate of suitability / CE marking


standard / for hazardous zone

EN 600079-15:2005, EN 600079-0:2006, II 3 G Ex nA II T4, KEMA 08 ATEX 0003 X

● CCC / for hazardous zone according to GB standard


certificate of suitability

EN 61000-6-2, EN 61000-6-4

● C-Tick


● KC approval


Marine classification association

● American Bureau of Shipping Europe Ltd. (ABS)


● French marine classification society (BV)


● Det Norske Veritas (DNV)


● Germanische Lloyd (GL)


● Lloyds Register of Shipping (LRS)


● Nippon Kaiji Kyokai (NK)


● Polski Rejestr Statkow (PRS)


● Royal Institution of Naval Architects (RINA)


● to web page: selection aid TIA Selection Tool


● to website: Industrial communication


● to website: Industry Mall


● to website: Information and Download Center


● to website: Image database


● to website: CAx-Download-Manager


● to website: Industry Online Support


security information

Siemens provides products and solutions with industrial security functions that support the secure operation of plants, solutions, machines, equipment and/or networks. They are important components in a holistic industrial security concept. With this in mind, Siemens’ products and solutions undergo continuous development. Siemens recommends strongly that you regularly check for product updates. For the secure operation of Siemens products and solutions, it is necessary to take suitable preventive action(e.g. cell protection concept) and integrate each component into a holistic, state-of-the-art industrial security concept. Third-party products that may be in use should also be considered. For more information about industrial security, visit http://www.siemens.com/industrialsecurity. To stay informed about product updates as they occur, sign up for a product-specific newsletter. For more information, visit http://support.automation.siemens.com. (V3.4)

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