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W4S1-03B

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Omron W4S1-03B is a three-port unmanaged industrial switching hub that forwards 10/100BASE-TX Ethernet traffic and prioritizes EtherNet/IP control data.
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Technical specifications for W4S1-03B

  • Manufacturer:
    Omron
  • Part Number:
    W4S1-03B
  • Product Family:
    Omron
  • Product Type:
    W4S1 3-Port Industrial Switching Hub
  • Stock:
    1
  • Ethernet Ports:
    3 RJ45
  • Ethernet Standards:
    IEEE 802.3 10BASE-T and 100BASE-TX
  • Switching Method:
    Store and forward
  • Auto Negotiation:
    Supported
  • Auto MDI/MDI-X:
    Supported
  • Switching Capacity:
    500 Mbit/s
  • Packet Forwarding Rate:
    148,800 packets/s
  • Frame Buffer:
    80 KB
  • MAC Address Table:
    2000 addresses
  • EtherNet/IP QoS:
    Selectable priority function
  • Failure Detection:
    Not supported on W4S1-03B
  • Supply Voltage:
    24 V DC ±5%
  • Current Consumption:
    0.22 A
  • Maximum Power Consumption:
    5.28 W
  • Operating Temperature:
    0 to +55 °C
  • Operating Humidity:
    10 to 90% RH, non-condensing
  • Weight:
    0.3571 lbs (0.162 kg)
  • Tariff Code:
    85176299
  • Country of origin:
    Japan
  • 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 Port Forwarding QoS Priority LED Diagnosis Network Limits

Features:

  • Provides three auto-negotiating 10/100BASE-TX RJ45 ports.
  • Uses store-and-forward switching with an 80 KB frame buffer.
  • Can prioritize EtherNet/IP implicit messages through selectable QoS.
The three ports of W4S1-03B form one unmanaged Ethernet switching domain for local automation devices.

Auto negotiation and Auto MDI/MDI-X remove manual speed and crossover-cable selection from each connection.

QoS changes the order in which queued frames leave the switch but does not add VLAN, SNMP or spanning-tree management.

The Omron W4S1-03B W4S1 3-Port Industrial Switching Hub may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Omron W4S1-03B W4S1 3-Port Industrial Switching Hub 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.

How Ethernet frames move between the three ports

  • Learning table: Source addresses populate the MAC table so known destinations use the required port.
  • Store and forward: A complete frame is buffered before it is transmitted to the destination port.
  • Unknown traffic: Frames without a learned destination are forwarded to the remaining ports.

How EtherNet/IP traffic is moved ahead

  • Implicit messages: Cyclic EtherNet/IP I/O traffic receives the highest documented priority.
  • IGMP packets: Multicast-management traffic follows the EtherNet/IP control class.
  • Other frames: Remaining Ethernet traffic stays in the lower queue when QoS is enabled.

What local indicators reveal

  • PWR: The green LED distinguishes an energized switch from loss of 24 V DC power.
  • L/A: The link/activity LED separates no link, established link and active frame transfer.
  • 100: The speed LED identifies a 100 Mbit/s link instead of a 10 Mbit/s link.

Functions not implemented in the unmanaged model

  • No VLAN: Ports cannot be divided into separate virtual LANs by the switch.
  • No SNMP: Remote management counters and configuration are not exposed through SNMP.
  • No failure output: W4S1-03B does not include the abnormal-output connector used on the W4S1-05C.
Description
Omron W4S1-03B is a three-port W4S1 industrial switching hub that forwards 10/100BASE-TX Ethernet frames between automation devices without managed-switch configuration.

Each RJ45 port on W4S1-03B performs auto negotiation and Auto MDI/MDI-X, allowing connected devices to establish speed and cable-pair orientation before frames enter the store-and-forward path.

When its QoS function is enabled, W4S1-03B gives EtherNet/IP implicit messages priority over other traffic, helping cyclic control frames leave the buffer ahead of lower-priority packets.

Power for W4S1-03B enters through the 24 V DC supply connector, while the port LEDs distinguish power, link activity and negotiated 100 Mbit/s operation during network commissioning.
Alternative Names
W4S103B W4S1 03B W4S1-3B OMRON W4S1-03B W4S1-03B Ethernet Hub W4S1-03B Switching Hub W4S1-03B 3-Port Switch W4S1 Series W4S1-03B
Technical notes
Omron W4S1-03B is an unmanaged 24 V DC industrial Ethernet switch with three auto-negotiating RJ45 ports and selectable EtherNet/IP QoS.
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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.
Why does an Ethernet cable on Omron W4S1-03B show no link light?
Check 24 V DC power to W4S1-03B, connector seating, the far-end port and cable continuity before investigating network addressing.
What changes when QoS is enabled on W4S1-03B?
Omron W4S1-03B moves EtherNet/IP implicit messages ahead of ordinary Ethernet frames while leaving the three ports in one unmanaged switching domain.
Can W4S1-03B report a broadcast storm through a relay output?
No, W4S1-03B does not include the failure-detection circuit or abnormal-output connector fitted to the W4S1-05C model.
How can a technician confirm the link speed on W4S1-03B?
Read the 100 LED beside the active port on W4S1-03B; its state distinguishes a 100 Mbit/s link from a 10 Mbit/s link.
Does W4S1-03B require a crossover Ethernet cable between automation devices?
Auto MDI/MDI-X on Omron W4S1-03B detects cable-pair orientation, so a dedicated crossover cable is not required for supported ports.