BC9120 Beckhoff
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The Beckhoff BC9120 is part of the BC Bus Terminals series and comes with an Ethernet fieldbus interface. It offers 2 kB each of allocated inputs and outputs and provides 4 kB of flag memory. The unit supports 1 PLC task and retains up to 2 kB of data.
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Product Description:
The BC9120 is a compact Bus Terminal Controller built by Beckhoff for the BC Bus Terminals series. It combines an embedded PLC and an Ethernet fieldbus coupler so slice I/O can be controlled directly from the station. Within an automation cell, the unit gathers decentralized digital or analog signals and transmits them to supervisory computers, making it a small-footprint node for distributed machine control. Because the user program executes locally, reaction times stay predictable even when higher-level networks are saturated.
During runtime, the controller maps 2 kB of address space to its input image, while a matching 2 kB segment is reserved for outputs. A further 4 kB flag area stores Boolean and byte variables that require high-speed access but not retention. Communication is handled through the Ethernet interface, permitting ADS over TCP/IP as well as conventional fieldbus telegrams. Task processing is organized in a single cycle because the controller supports only 1 PLC task, so all user code must execute within that interval. Up to 2 kB of retain memory preserves counters and recipe data across power cycles. Status bits, watchdogs, and forcing functions follow Beckhoff diagnostic conventions, which helps keep controller behavior consistent across similar systems.
The station ships with the default AMS Net ID set to 172.16.23.[DIP-Switch].1.1, and changing the rotary switches on the front panel updates this identifier to create a unique network address. For serial access or bootstrap operation, revision B0 or newer is required, while Ethernet access needs TwinCAT 2.10 Build 1322 and serial ADS development needs TwinCAT 2.9 Build 1010 or newer. These version levels allow variable lists, online changes, and startup parameters to exchange correctly with the development environment.
Frequently Asked Questions about BC9120:
Q: What type of fieldbus interface is provided on the BC9120?
A: The BC9120 features an Ethernet fieldbus interface for communication within automation networks.
Q: What are the allocated memory capacities for inputs and outputs on the BC9120?
A: This model can allocate up to 2 kB each for both inputs and outputs.
Q: How many PLC tasks can the BC9120 handle simultaneously?
A: The BC9120 supports a maximum of one PLC task during operation.
Q: How much flag memory does the BC9120 have?
A: This device includes 4 kB of flag memory for internal control and state storage.
Q: What is the maximum retain data size for the BC9120?
A: A maximum of 2 kB of data can be retained on the BC9120 after a restart.
