FC3102-1258 Beckhoff
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The Beckhoff FC3102-1258 is part of the FC Lightbus Cards series and features two fieldbus channels with an RS485 interface that support PROFIBUS DP, DP-V1, DP-V2, and PROFIBUS MC systems. This PCI plug-and-play card offers 4 kbytes DPRAM per channel, is galvanically isolated, and has bus connectors using two D-Sub sockets. It supports communication as both master and slave, allows up to 125 slaves per channel, and operates at a typical current consumption of 1000 mA with a 5 V supply.
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Product Description:
The FC3102-1258 is a plug-and-play PCI fieldbus interface manufactured by Beckhoff within the FC Lightbus Cards series. Installed in a control PC, the card equips the system with direct PROFIBUS DP capability so that automation software can operate as a network master, a network slave, or both simultaneously. Two onboard D-Sub sockets provide separate channels that transmit PROFIBUS telegrams through differential RS485 signaling. By offloading protocol handling to dedicated hardware, the board frees the host CPU and maintains deterministic exchanges of process data between centralized control and distributed devices.
All logic on the card is powered from the PCI backplane at 5 V, and the circuitry typically draws 1000 mA, so cabinet power budgets can be planned accurately. A 32-bit bus width allows the operating system to map dual-ported RAM directly into linear address space for low-latency transfers. The galvanically isolated RS485 interface protects the PC ground from field potentials while sustaining the high-speed differential signaling required by PROFIBUS. Communication resources are split across two independent channels, enabling parallel control of distinct network segments without requiring another interface card.
Each channel can manage up to 125 PROFIBUS nodes, and the firmware supports a maximum payload of 244 bytes per slave, covering typical sensor, actuator, and drive data sets. The aggregated process image available to the host reaches 3 kbytes, ensuring that cyclic data from both channels fit within a single DMA frame. Local buffering is handled by a dual-ported memory block of 4 kbytes per channel, so telegrams can queue without stalling the PCI bus even at high update rates. Two status LEDs on each channel provide simple visual diagnostics during setup and service. These indicators help users observe channel activity and identify communication faults without opening diagnostic software. Separate visual feedback for each network segment also makes it easier to distinguish a localized connection issue from a card-level problem during routine operation.
