SPS IPC Drives Hall 4A, Booth 326
With revised Ethernet Powerlink encoders based on an Altera FPGA design, Posital offers a cost-effective way to migrate from CAN open to the Ethernet-based successor standard. The depth of the new encoder generation has been reduced - the housing dimensions of the devices are now identical to those of the fieldbus models. They allow cycle times of up to 400 μs or, in the case of low asynchronous data traffic, up to 240 μs.
In addition to the classic polling mode, in which the master (managing node) interrogates each slave (controlled node), the modes "Poll Response Chaining" and "Poll Multiplexing" are supported. With this enhancement of the operating modes, the interface design allows own applications to be implemented energy-efficiently in the time-critical area and increase the bandwidth. The rugged M12 connectors ensure IP67 protection. Standard pre-assembled cables simplify installation and eliminate installation errors. The connection hood, which can be separated in the previous generation and is equipped with two rotary switches, is now firmly integrated in the rotary encoder. Two externally accessible hex encoded address switches in IP67 allow easy setting of the host ID within the Net ID. With the integrated hub and thanks to extremely short delay times, even longer line structures can be implemented. The diagnostic LEDs indicate the status for traffic or link at the respective port connection as well as the device status from a network view.
The Ethernet Powerlin encoders, for which the encoder profile C2 was implemented in accordance with DS-406 (CAN open), operate on the basis of a proven, opto-electronic measuring principle, which ensures interference-free sampling. Their single-turn sensor technology delivers a resolution of 16 bits per revolution. Up to 16.384 revolutions (14 bits) can additionally be recorded in multi-turn mode, so that a total of one measuring range is covered by 30 Bit.