An absolute encoder, also called an absolute rotary encoder, gives every shaft position its own unique value. The position is known as soon as the power is switched on, without a reference run, which is why absolute encoders measure angle and position in cranes, wind turbines, packaging and printing machines, mobile machinery and robotics. SCN supplies absolute encoders from Posital: magnetic IXARC encoders in the UCD family, optical encoders in the OCD, OCE and OCM families, and redundant CANopen encoders in the TCR family.<\/p>\n
The range covers single-turn and multi-turn models with solid or hollow shaft, resolutions up to 16 bits per turn, IP69K versions for washdown and outdoor use, ATEX versions, and interfaces from SSI and analog 4\u201320 mA or 0.5\u20134.5 V to IO-Link, CANopen, PROFIBUS-DP, PROFINET and EtherCAT. If you only need speed or relative movement, incremental encoders<\/a> are a simpler choice. For straight-line movement, see incremental linear position sensors<\/a>. All sensor types are listed under Sensors<\/a>.<\/p>\n How to choose:<\/strong> first decide between single-turn and multi-turn, and the resolution you need. Then choose the interface your controller uses, solid or hollow shaft and its diameter, flange, and connector or cable outlet. Finally check the IP rating, temperature range and any approvals the environment requires.<\/p>\n An absolute encoder reports the actual position as a unique value, while an incremental encoder only sends pulses that the controller has to count from a reference point. After a power failure the absolute encoder knows its position at once; an incremental encoder needs a new homing run. Incremental encoders are simpler and well suited to measuring speed.<\/p><\/details>\nFrequently asked questions<\/h3>\n
What is the difference between an absolute and an incremental encoder?<\/summary>