BC9120 Beckhoff Fieldbus Modules & Gateways

The Beckhoff BC9120 from the BC Bus Terminals series by Beckhoff is a high-performance Bus Coupler designed for seamless integration into modern automation systems. It supports TwinCAT ADS and Modbus TCP protocols, ensuring robust communication across industrial networks. With a PLC cycle time of approx. 1 ms for 1,000 instructions , the BC9120 delivers rapid processing capabilities for time‑critical tasks. This unit manages up to 64 bus terminals (expandable to 255 terminals via K‑bus extension) and serves as the central interface for distributed I/O modules. At the core of the BC9120 lies a versatile technical foundation. It features a Data Memory of 128 kbytes and Program Memory of 128 kbytes, backed by Remanent Data storage of 2 kbytes and an additional Persistent Data buffer of 1 kbyte to safeguard against unexpected power loss. The device offers dual RJ45 ports with a built‑in 2‑channel switch and automatic data transfer rates of 10/100 Mbit/s . It handles a maximum of 512 bytes for both fieldbus input and output streams. Programmers benefit from comprehensive IEC 61131‑3 language support (IL, LD, FBD, SFC, ST) and can perform online changes without system downtime. The BC9120 accommodates up to 2,040 digital peripheral signals and 512 analog I/O signals , delivering extensive channel density in a compact package. Its 24 V DC power supply tolerance (–15%/+20%) ensures stable operation in fluctuating power environments. The module’s protocol versatility and automatic interface recognition simplify network commissioning and maintenance. Designed for industrial automation, the BC9120 excels in reliability and efficiency, making it ideal for complex machine control, process automation, and scalable I/O architectures where uninterrupted performance and flexible expansion are paramount.