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Advanced Engineering 2021

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Bus controller overcomes CAN topology restrictions

Bus controller overcomes CAN topology restrictions

The new Powerlink bus controller X67BC8780.L12 from B&R has an integrated hub for eight CAN connections. The star topology of the CAN network allows a higher maximum total cable length and better utilization of the bandwidth. It also greatly simplifies cabling. External CAN devices can be connected to each of the eight separate CAN lines with a standard CAN bus topology. Each line can extend out to the maximum length determined by the baud rate.

All eight CAN bus controller connections are terminated using integrated terminating resistors. Full FPGA implementation allows the hub to achieve minimal throughput times. The device offers IP67 protection and is suitable for installation outside the control cabinet.

According to its specifications, a CAN network can only be built as a line structure with very limited branch lines. The new X67 hub groups various CAN segments into a collision domain. It functions similarly to an active star coupler in a fibre optic network. With the active coupling, the individual segments are no longer subject to the restrictions of branch lines, which greatly simplifies cabling.

At each CAN connection, 200mA are available for the sensor power supply. The connections are short-circuit proof. The bus controller has a wide voltage range of 9-32V DC. All sensors used in the industrial and automotive sectors can be connected directly using a single cable. An additional connector allows the I/O power supply to be daisy-chained to additional modules. The M12 connection technology and use of prefabricated standard cables, commissioning teams can immediately begin setting up the machine without having to first tediously check cables.

A further new product from B&R is the X20SO6530 digital output module provides six safety relays on a unit with the X20’s standard 25mm width, allowing B&R to offer a cost-effective and space-saving solution for applications where numerous floating signals are needed. To meet safety requirements, positively driven feedback contacts must be evaluated in a manner that is appropriate for safety technology. This new X20 module evaluates this data internally, making it just as easy to use the six safe relay outputs as it is to use semiconductor-based outputs. The digital output module has single-channel isolated outputs with a maximum switching capacity of 230V AC, 6A or 24V DC, 6A.

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