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6GK7377-1AA00-0AA0

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As a CSM 377 unmanaged Industrial Ethernet switch, Siemens 6GK7377-1AA00-0AA0 connects Ethernet devices through four RJ45 ports.
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Technical specifications for 6GK7377-1AA00-0AA0

  • Manufacturer:
    Siemens
  • Part Number:
    6GK7377-1AA00-0AA0
  • Product Family:
    Siemens Simatic Net
  • Product Type:
    CSM 377 Industrial Ethernet Switch
  • Stock:
    1
  • Ethernet Ports:
    4 RJ45 ports
  • Port Rates:
    10/100 Mbit/s
  • Switch Management:
    Unmanaged
  • Switching Method:
    Store-and-forward
  • MAC Address Capacity:
    1,024 addresses
  • Address Aging:
    300 s
  • Supply Voltage:
    24 V DC nominal; 19.2–28.8 V DC
  • Current Consumption:
    70 mA
  • Power Loss:
    1.6 W
  • Power Connection:
    2-pole terminal block
  • Protection Rating:
    IP20
  • Operating Temperature:
    0 to +60 °C
  • Storage Temperature:
    -40 to +70 °C
  • Relative Humidity:
    95% maximum; non-condensing
  • Mounting:
    SIMATIC S7-300 rail
  • Altitude Derating:
    Maximum +56 °C at 2,000 m; +50 °C at 3,000 m
  • Weight:
    0.5732 lbs (0.26 kg)
  • Estimated shipping dimensions:
    12.9×3.5×14.2cm
  • Tariff Code:
    85176232
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Link Setup Port Indicators Rail Mounting Network Layout

Features:

  • Automatic MDI/MDIX permits straight-through Ethernet cables.
  • Receive-pair polarity is corrected automatically.
  • No switch configuration is required for plug-and-play operation.
The 6GK7377-1AA00-0AA0 switch learns Ethernet source addresses and maintains an address table. Address aging removes entries after the specified interval rather than treating every learned connection as permanent.

Network-terminal devices connect directly to the RJ45 ports of 6GK7377-1AA00-0AA0. The four copper ports do not constitute an optical-fiber interface or a separate PLC backplane connection.

The ambient-temperature allowance for 6GK7377-1AA00-0AA0 decreases at elevated installation altitudes. The sea-level temperature limit should therefore not be applied unchanged to a higher-altitude cabinet.

The Siemens 6GK7377-1AA00-0AA0 CSM 377 Industrial Ethernet Switch may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 6GK7377-1AA00-0AA0 CSM 377 Industrial Ethernet Switch Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

Let each connected pair establish its Ethernet link

  • Negotiation: The switch negotiates transmission rate and duplex mode with an autonegotiating partner.
  • Fixed partner: A partner without autonegotiation must use 10 or 100 Mbit/s half-duplex operation.
  • Cable pairs: Automatic crossover assigns the transmit and receive pairs without requiring a crossover cable.
  • Polarity: Receive-pair polarity correction operates at the Ethernet connection rather than changing application data.

Read link state separately from power state

  • Supply indicator: The green power LED indicates a connected supply; it is off when supply is absent or below the indicated threshold.
  • Idle link: A green port indication means a link is present without received data activity.
  • Receive activity: A yellow port indication identifies a link with received data.
  • Startup test: Synchronous flashing belongs to the power-on self-test indication.

Position the switch outside the backplane path

  • Rail type: The mounting arrangement is designed exclusively for the S7-300 rail.
  • Station position: Because no backplane-bus feed-through is provided, place the switch at the beginning or end of the station.
  • Earth contact: The rear contact and fixing screw connect the module to the rail grounding arrangement.
  • Heat exposure: The installation should avoid direct solar radiation and additional heat sources.

Build a line or star without closing a loop

  • Line network: Successive Ethernet connections can form a linear bus arrangement.
  • Star network: The ports can connect separate branches in a star arrangement.
  • Loop prevention: Connecting two ports together, or creating a loop through several switches, can overload the network.
  • Cable construction: Permitted link length depends on the FastConnect cable type and any patch-cable section, not only the Ethernet port rating.
Description
Within the SIMATIC NET range, Siemens 6GK7377-1AA00-0AA0 is the CSM 377 compact switch module for Industrial Ethernet. It brings four twisted-pair network connections into an S7-300 rail installation without acting as a PLC I/O module.

Frames passing through 6GK7377-1AA00-0AA0 are handled by store-and-forward switching. Forwarding delay depends on frame length; a sequence of switches adds forwarding delay at each stage. The forwarding process is therefore distinct from simply passing an electrical signal through a passive connector.

An external two-pole terminal supplies 6GK7377-1AA00-0AA0, rather than the S7-300 backplane. The L+ terminal takes the positive DC connection and M the return; protective grounding is established through the rear contact and fixing screw on the rail.

The power input of 6GK7377-1AA00-0AA0 includes a resettable PTC fuse. Its supply must satisfy the specified extra-low-voltage and limited-power requirements; the input is not intended for AC operation or a voltage above the permitted DC range.
Alternative Names
6GK73771AA000AA0 6GK7377 1AA00 0AA0 6GK7 377-1AA00-0AA0 Siemens 6GK7377-1AA00-0AA0 6GK7377-1AA00-0AA0 CSM 377 Industrial Ethernet Switch 6GK7377-1AAOO-OAAO 6GK7377-IAA00-0AA0 CSM 377 Industrial Ethernet Switch 6GK7377-1AA00-0AA0
Technical notes
Siemens 6GK7377-1AA00-0AA0 is an unmanaged switch with RJ45 ports, automatic link negotiation and a separate two-pole DC supply connection.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
A fixed full-duplex device cannot negotiate: how should it connect to 6GK7377-1AA00-0AA0?
Configure a non-autonegotiating partner for 10 or 100 Mbit/s half-duplex when connecting it to 6GK7377-1AA00-0AA0; fixed full-duplex is not the specified partner setting.
Does every cable arrangement on 6GK7377-1AA00-0AA0 allow a 100 m run?
No. The cable limits for 6GK7377-1AA00-0AA0 distinguish standard FastConnect cable, marine or trailing cable, and patch sections. For example, the standard-cable arrangement allows 100 m or 90 m plus a 10 m patch section.
May two ports of 6GK7377-1AA00-0AA0 be linked to create redundancy?
Do not close a loop between ports of 6GK7377-1AA00-0AA0 or through additional switches. This unmanaged switch is not intended to form a redundant ring.
Why does a port LED on 6GK7377-1AA00-0AA0 turn yellow during communication?
Yellow is the receive-activity indication on 6GK7377-1AA00-0AA0, not a generic fault color. A green indication instead shows a link without received data activity.
Where should 6GK7377-1AA00-0AA0 sit when adjacent S7-300 modules need a continuous backplane?
Install 6GK7377-1AA00-0AA0 at the beginning or end of the station, because it does not pass the S7-300 backplane bus through to the next module.