November 29, 2012 -POSITAL revised Ethernet POWERLINK encoders to provide users with a low-cost option for the migration from CANopen to the Ethernet-based successor standard.
The length of the new encoder generation has been reduced: the new models' housings are now identical to the fieldbus versions. The encoders enable cycle times as low as 400 µs or, with little asynchronous data traffic, 240 µs. In addition to the standard polling mode with the Master (Managing Node) polling each Slave (Controlled Node), the encoders also support the “Poll Response Chaining” and “Poll Multiplexing” modes.
The interface design and these additional modes enable users to implement time-critical applications more efficiently and allow increased bandwidth.
The encoders' robust, IP67-protected M12 connectors are a key advantage. They facilitate installation through standard, pre-assembled cables and prevent installation errors. Previously removable, the connection cap with two rotary switches is now integrated into the encoder. Two hex-encoded IP67 address switches can be accessed from the outside and allow an easy configuration of the host ID within the net ID. This considerably reduces maintenance and integration efforts for the network administrator.
Thanks to an integrated hub and very short delay times, even long line structures can be implemented. The diagnosis LEDs display the traffic and link status at each port connection as well as the device status from the network's perspective.
Supporting the encoder profile according to DS-406 (CANopen), the Ethernet POWERLINK encoders use a proven opto-electronic scanning method that ensures interference-free measurement. The single-turn sensor provides a resolution of 16 bits per revolution. In addition, a maximum of 16,384 revolu-tions (14 bits) can be measured in multi-turn mode, thereby covering a measur-ing range of 30 bits. Like all optical POSITAL encoders, the do not require backup batteries or referencing – they instantly provide current, absolute posi-tion and revolution values even after power loss. The encoders are available as hollow and solid shaft versions.
Optionally, POSITAL also provides stainless steel models.