Beckhoff BC3150 PROFIBUS Bus Terminal Controller

Description

Executing local control logic at the field level, the Beckhoff BC3150 functions as a high-efficiency PROFIBUS Bus Terminal Controller. This compact PLC device manages up to 64 decentralized Bus Terminals (expanding to 255 with a K-bus extension) and interfaces seamlessly with primary PROFIBUS DP master controllers. Engineered with integrated memory and an execution environment programmed via TwinCAT, it serves as a robust processing node for distributed industrial automation architectures.

Features

• Embedded PLC Functionality: Programmed using TwinCAT in standard IEC 61131-3 languages (IL, LD, FBD, SFC, ST).
• High-Speed Communication: Automatic baud rate detection up to 12 Mbaud on the PROFIBUS DP interface.
• Scalable I/O Capacity: Direct connection of up to 64 Bus Terminals, handling up to 2,040 digital or 128 analog peripheral points.
• Optimized Memory Footprint: Equips 48 kbytes of program memory, 32 kbytes of data memory, and 2 bytes of non-volatile (remanent) data storage.
• Modular Expansion: K-bus system connection delivers up to 1750 mA current supply to downstream input and output terminals.

Applications

• Decentralized process control and subsystem preprocessing.
• Machine-level PLC execution with dedicated fieldbus handshaking.
• Distributed packaging, logistics, and material handling systems requiring autonomous local safety logic.

Technical Specifications

Connections and Interfaces

Alternative Models & Compatibility

While the standard BK3120 and BK3150 function purely as non-programmable PROFIBUS couplers, the BC3150 offers a built-in PLC engine. When transitioning from BK series couplers to the BC3150, physical space on the DIN rail remains compact, but modifications in the master TwinCAT runtime system config are necessary to accommodate local program execution variables rather than straight I/O pass-through mapping.

Application Pitfalls & Engineering Notes

Calculate the cumulative power draw of all connected Bus Terminals prior to mounting. Since the internal K-bus current capability peaks at 1750 mA, complex analog I/O clusters or high-density digital modules may exhaust this allocation. In cases of power depletion, deploy intermediate Beckhoff KL9110 or KL9210 power feed terminals to prevent diagnostic bus failures and system drops.

Commissioning & Wiring Tips

To guarantee clean communications up to 12 Mbaud, use PROFIBUS-certified shielded twisted-pair cabling. Maintain active bus termination at both the beginning and end of each PROFIBUS physical segment. During commission, configure address settings accurately via the KS2000 software tool or through the built-in rotary DIP switches situated beneath the terminal cover.

Installation Guidelines