• Product type: Compact Ethernet switch module
• Manufacturer: Siemens
• Product family: SIMATIC S7-1200 Communication
• Model designation: CSM 1277
• Article number: 6GK7277-1AA10-0AA0
• Function:

Industrial Ethernet switch for SIMATIC S7-1200

Expands Ethernet connectivity of PLC systems

• Switch type: Unmanaged switch
• Number of ports:

4 × RJ45 Ethernet ports

• Transmission rate:

10/100 Mbit/s (Fast Ethernet)

• Interface type:

Industrial Ethernet (RJ45)

• Supply voltage:

24 V DC (external supply)

• Diagnostics:

LED indicators for power and port status

• Mounting type:

DIN rail mounting

Side mounting with SIMATIC S7-1200 modules

• Protection class: IP20
• Operating temperature: −20 °C to +60 °C
• Storage temperature: −40 °C to +70 °C
• Relative humidity: Up to 95% (non-condensing)
• Dimensions (W × H × D):

45 × 100 × 75 mm

• Weight:

Approx. 0.15 kg

• Typical applications:

Expanding Ethernet ports on PLC systems

Connecting HMI panels, drives, and network devices

Industrial automation networks

1. Dtasheet