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      X20BC0087

      Modbus Bus Controller
      Ships by Thursday, November 12
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      B&R X20BC0087 connects X2X Link I/O to a Modbus TCP or UDP master through an integrated two-port 10/100 Mbit/s Ethernet switch.
      • Manufacturer part number
        X20BC0087
      • Shipping
        Swift global dispatch
      • Condition
        New, original product
      • Shipping size (est.)
        10.3cm x 2.5cm x 5.9cm
      • Country of Origin
        Austria

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      What happens after you enquire

      • 0

        Review your reference

        Send the complete B&R X20BC0087 reference, label photographs and required quantity. Record address switches, stored network parameters and the X20 module map.

      • 1

        Confirm the offer

        Review the offered revision, condition, included items and documents against the confirmed installation.

      • 2

        Arrange dispatch

        Confirm quantity, dispatch date, lead-time start and delivery details in the quotation.

      • Match the complete marking

        Include the complete B&R X20BC0087 marking and any hardware revision on the item. Record address switches, stored network parameters and the X20 module map.

      • Check the offered item before ordering

        Request available label and connector photos. Have your maintenance team compare the offered X20BC0087 with the installed equipment and applicable B&R documents.

      Technical specifications for X20BC0087

      • Manufacturer:
        B&R
      • Product Category:
        PLC Systems
      • Spare Part Number:
        X20BC0087
      • Weight:
        0.06 kg
      • Tariff Code:
        8537101190
      • Fieldbus role:
        Modbus TCP/UDP slave
      • Ethernet ports:
        2 shielded RJ45, integrated switch
      • Transfer rate:
        10/100 Mbit/s
      • Physical layer:
        10BASE-T / 100BASE-TX
      • Duplex:
        Half or full duplex
      • Maximum segment:
        100 m
      • Minimum fieldbus cycle:
        1 ms
      • Minimum X2X cycle:
        500 microseconds
      • Configured I/O cycle:
        0.5–4 ms
      • Bus power:
        2 W
      • Local expansion:
        Up to 250 additional modules
      • Electrical isolation:
        Modbus isolated from bus and I/O
      • Operating temperature:
        -25 to +60°C horizontal; -25 to +50°C vertical
      View as PDF Ask for Quote

      Information

      Overview Downloads Applications / Compatibility Product Precautions
      • B&R X20BC0087 provides a network-facing I/O station that maps local X20 expansion data into the configured Modbus application.
      Protocol: Modbus TCP or UDP slave
      Ethernet: Two-port 10/100 Mbit/s switch
      I/O expansion: X2X Link with configurable cycle
      The controller can operate with a B&R controller or another system providing the required Modbus master functionality. Its integrated switch simplifies Ethernet wiring while the X2X Link connects the local expansion modules.

      Address switches and stored parameters determine startup addressing. DHCP and BOOTP operation are supported, but certain switch settings initialize parameters or save received addressing, so replacement requires more than copying the visible IP address.

      The I/O cycle can be configured from 0.5 to 4 ms. Fieldbus and X2X minimum cycles differ, and synchronization between the bus systems is not available; network loading and switch activity also affect response time.
      Controller platform reference: B&R X20 Modbus TCP/UDP. Match network addressing, register mapping and X2X configuration.
      The original technical excerpt applicable to B&R X20BC0087 covers Modbus interface ratings, address switches, indicators and X2X expansion. The separate installation guide covers network settings, station assembly, I/O mapping and communication-loss tests.
      Original manufacturer pages retain their technical context. Use the Apter Power guide with the applicable manufacturer instructions and approved installation design.
      System and supply context: The controller presents X2X Link I/O to a compatible Modbus master over Ethernet.

      Application scope: Use the configured station map and application timing; do not infer deterministic synchronization between the network and local bus.
      Prepare B&R X20BC0087 for its configured installation using these checks.
      Address mode

      Record switches and stored parameters before replacement.

      I/O map

      Restore module order and register assignments.

      Reset settings

      Avoid initialization switch settings during normal replacement.

      Timing

      Check both fieldbus and X2X cycle requirements.

      Cable length

      Keep Ethernet segments within 100 m.

      Fault response

      Test watchdog and communication-loss behavior.

      Alternative Names

      B&R X20BC0087

      Technical notes

      Signal and interface: Minimum cycle time is 1 ms for the fieldbus and 500 microseconds for X2X Link. These limits do not establish synchronized end-to-end response.

      Installation boundary: Use the uncoated module limits: 5–95% noncondensing humidity and the orientation-specific temperature range.

      Technical basis: B&R X20(c)BC0087 Data sheet V2.40. Use the uncoated X20BC0087 ratings. Fieldbus and X2X minimum cycle times are separate and the two buses are not synchronized.

      FAQ View All FAQ

      • Is X20BC0087 the Modbus master of the network?
        No. It operates as a Modbus TCP/UDP slave connected to a compatible master.
      • Why are there two RJ45 ports on X20BC0087?
        They form an integrated 10/100 Mbit/s switch for the approved Ethernet wiring topology.
      • Can the fieldbus and X2X cycles of X20BC0087 be synchronized?
        No. Synchronization between these bus systems is not available.
      • What does address switch 0x00 do on X20BC0087?
        The switches do not override system parameters at 0x00; valid flash-memory parameters are used, otherwise factory defaults apply.
      • When does X20BC0087 use DHCP through its address switches?
        The 0x80–0xEF range selects DHCP operation with a hostname derived from the switch value.
      • Why should 0xFE be avoided during ordinary replacement of X20BC0087?
        At boot, 0xFE initializes all bus-controller parameters to defaults rather than reading the stored values.
      • What does a four-pulse red S/E indication mean on X20BC0087?
        It indicates that the controller detected an IP address being used twice.
      • How many additional modules can X20BC0087 address through X2X Link?
        The integrated local expansion supports up to 250 additional modules, subject to the configured system and power design.
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