Product Description for B&R 7AC911.9 CAN Bus Connector

7AC911.9 is an original CAN bus connector accessory manufactured by B&R Industrial Automation, categorized under the 7AC series of communication infrastructure spare parts. This component serves as the physical link between B&R System 2003 PLC rack modules and CAN fieldbus networks, enabling reliable two-way data transmission between controllers, distributed I/O stations, and peripheral automation devices. It is a plug-and-play passive connection unit designed for standard industrial cabinet deployment, integrating termination control, signal status indication, and secure cable wiring structures within a compact single-piece housing. The product meets global industrial compliance standards CE and UKCA, validated for stable operation in standard factory workshop environments. Original sealed new stock and certified tested refurbished units are available for global industrial system maintenance and upgrade projects.

The official manufacturer part number is 7AC911.9, with core classification as CAN DSUB bus connector for System 2003 control platforms. The main interface adopts a 9-pin female DSUB metal connector shell for mating with matching male DSUB ports on B&R CPU and communication modules. Internal wiring terminals use screw clamp terminals to accommodate two CAN bus cable lines, eliminating the need for soldering during field installation. An integrated strain relief structure is molded into the connector body to protect cable junctions from tensile force and vibration damage during long-term operation. The net weight of one standalone connector unit is low-mass for lightweight rack assembly, and each unit is supplied as an individual piece without bundled wiring cables or extra mounting fasteners. Global customs tariff classification falls under electrical automation communication fittings for cross-border shipment procedures.

The core function of 7AC911.9 is establishing standardized physical CAN bus topology connections for B&R System 2003 PLC stations. It acts as the junction point to daisy-chain multiple automation nodes along a single CAN bus trunk line, supporting linear network layout commonly used in machine and production line control systems. A switch-controllable built-in terminating resistor allows users to activate or deactivate line termination resistance flexibly; the resistor must be switched on exclusively for the first and last nodes of the CAN bus network to suppress signal reflection and ensure transmission integrity. Two dedicated RX and TX LED status lights provide real-time visual diagnostics: TX illumination indicates outgoing data packets from the local node, while RX light confirms receipt of incoming bus signals, simplifying on-site troubleshooting of communication faults without additional testing tools. The connector replaces blank bus covers such as 7AC020.9 when expanding CAN communication ports on empty rack slots, supporting modular, staged system expansion without overhauling the entire rack framework. Its shielded metal housing suppresses electromagnetic interference from adjacent power drives, contactors, and frequency converters inside electrical cabinets.

Supported CAN bus baud rates correspond to maximum permissible cable lengths: 500 kbit/s for bus segments up to 60 meters, 250 kbit/s for maximum 200-meter wiring runs, and 50 kbit/s for extended 1000-meter long-distance CAN networks. The integrated terminating resistor is factory-calibrated to standard CAN bus impedance specifications for signal matching. Maximum power consumption of the connector assembly reaches 4.5 W under full signal load conditions. Operating ambient temperature range for continuous stable operation spans 5°C to 40°C; short-term peak operational tolerance extends moderately within controlled cabinet cooling environments. Storage temperature range covers -25°C to 55°C, with transport temperature allowances up to 70°C for logistics transit cycles. The connector shell uses durable industrial-grade plastic with a metal shielding frame, gold-plated DSUB contact pins for low-resistance, corrosion-resistant signal transmission. Screw clamp terminals accept standard twisted-pair CAN bus cable conductors, enabling repeatable wiring and re-termination during system reconfiguration. No internal active electronic processing chips are integrated; the unit operates purely as a passive wired connection assembly with no firmware or software configuration requirements. Mechanical locking threads on the DSUB interface ensure tight, vibration-resistant fastening to module front panels to prevent loose connections during equipment runtime.

7AC911.9 is engineered as a dedicated fit for B&R System 2003 series backplane racks, CPUs, CAN communication adapters, and corresponding digital/analog I/O modules within the System 2003 platform; it is not mechanically interchangeable with X20, X67, APC or ACOPOS series bus connectors from other B&R product lines. It pairs with shielded twisted-pair CAN fieldbus cables specified by B&R for industrial signal transmission. No extra mounting brackets, gaskets, or terminal adapters are mandatory for standard installation. When multiple bus nodes are deployed, identical 7AC911.9 connectors are used at every station junction point along the CAN trunk line. For parallel PROFIBUS network setups within the same cabinet, the model 0G1000.00-090 PROFIBUS bus connector serves as the matching counterpart accessory. Unused rack bus positions that do not require CAN expansion are sealed with the 7AC020.9 bus cover to maintain cabinet protection and rack structural stability. Standard IP20 rated System 2003 cabinet enclosures provide the proper environmental housing for the connector during daily operation.

This CAN bus connector is exclusively deployed on automation control stations built around B&R System 2003 PLC hardware architectures. Primary application sectors include discrete manufacturing machinery: packaging equipment, textile spinning and weaving production lines, CNC metal cutting machine tools, plastic injection molding presses, and commercial printing machinery. It also supports auxiliary process control systems in food and beverage processing plants, municipal water treatment pumping stations, automated material handling conveyor systems, and small-scale assembly robot peripheral control loops. Installation is limited to IP20 protected indoor electrical control cabinets in factory production workshops and sheltered semi-outdoor equipment housings. It is not rated for direct deployment in high-corrosion gas, constant high humidity, or explosive hazardous area environments unless paired with fully sealed upgraded cabinet enclosures and additional ingress protection modifications.

Genuine original 7AC911.9 units carry permanent laser-etched B&R branding, part number, and revision marking on the connector housing, with full traceable factory production batch coding. The model remains available via authorized industrial spare part distributors, with refurbished units undergoing complete mechanical fitting and communication signal testing prior to resale, typically covered by supplier warranties ranging from 12 to 24 months. No programming, parameter downloading, or software commissioning steps are needed for installation; only physical wiring and terminating resistor switch adjustment are required for commissioning. Long-term storage must occur in dry, temperature-stable warehouse conditions to avoid plastic housing brittling, contact pin oxidation, or terminal screw corrosion. When replacing aged connectors, strict platform compatibility verification is required to avoid mismatched dimensions with newer generations of B&R control hardware.