Siko WV5850 Absolute Encoder

The absolute optical multiturn rotary encoder WH5850 is particularly high-resolution and designed for time-critical applications. Thanks to the large selection of Industrial Ethernet interfaces, such as PROFINET (also with PROFIdrive profile), EtherNet/IP and EtherCAT, as well as short reaction times and 100% magnetic insensitivity, it is ideally suited for use in drive technology, warehouse technologies and factory automation. Thanks to the support of the latest PROFINET, EtherNet/IP and EtherCAT functions, it offers easy integration and optimum system availability!


Rotary encoders based on the absolute measuring method

Absolute rotary encoders also called Absolute value encoders, are encoders which unambiguously encode every shaft position and display it as a position value. Thus, absolute value encoders are able to deliver unambiguous position values from the moment they are started. For instance, an absolute rotary pulse encoder detects its position exactly also after restart even when it has changed in the de-energized state. Therefore, with the absolute measuring method compared to incremental rotary encoders, there is no need for time-consuming reference travels after machine start or after loss of supply voltage.

Absolute single-turn rotary encoders

Single-turn rotary encoders are angle encoders, which are able to absolutely acquire and output the position within one revolution (360°. These encoders are particularly suited for applications where a swivel movement is to be acquired absolutely. ‘The availability of very small design and their ability to acquire absolute angle positions at especially low cost is another great advantage single-turn encoders from SIKO.

Absolute multi-turn rotary encoders

If more than 360° are to be scanned absolutely, a multi-turn rotary encoder is required. The absolute multi-turn rotary encoders from SIKO do not only detect the position exactly within one revolution but count the number of revolutions in addition. SIKO offers two different technologies. Firstly, via an especially developed durable multi-turn gear where the revolutions of the shaft are stepped down and detected by additional sensors. Secondly, the innovative Energy Harvesting Technology. These particularly small multi-turn rotary encoders detect the number of revolutions contactlessly and without battery and gear above all. A special process within a revolution (no matter how fast or slow) generates energy. This energy is used for an exact detection of the number of revolutions even in the dead state and to store the data.

Just as with the incremental rotary encoders, SIKO offers a wide array of different designs and housing variants of absolute rotary encoders. For example, the rotary encoders can be ordered with a common 58mm flange or with a 36mm housing, which is suitable for applications with confined space. Also, special heavy-duty rotary encoders are available with housings made of stainless steel or aluminum and protection classes up to IP69K.

A wide spectrum of interfaces rounds off the package. Thus, rotary encoders with fieldbus interfaces such as CANopen are available besides serial interfaces such as SSI or analog interfaces.


  • Absolute measurement system
  • Very high resolution
  • Precise positioning
  • Different interfaces
  • Fieldbus interfaces
  • Miniature designs also available in heavy-duty housings




Today, SIKO’s robust and innovative measurement technology is being applied globally in industry and mechanical engineering. Five subsidiaries and approximately 60 representations ensure direct contact and technical support for our customers on a national and international scale. Sales engineers and service technicians support OEM customers as well as users on-site with competent consulting and customer service in their own languages.


  • Absolute optical encoder
  • High-precision and up to 19 bit single-turn resolution
  • PROFINET IO, EtherNet/IP, EtherCAT interfaces
  • Robust bearing construction as well as high shock and vibration resistance
  • 100% magnetic insensitivity
  • Fast commissioning and high system availability
  • Industry 4.0 ready


Frequently being used for precise speed measurement and position monitoring in diverse applications including packaging plants, textile machines, printing machines, woodworking machines or asynchronous motors.


Feature Technical data Additional information
Shaft rustproof stainless steel
Flange aluminum
Housing aluminum
Speed ≤9000 rpm transient for ≤10 min., with EPN PROFINET IO
≤6000 rpm continuous operation, with EPN PROFINET IO
≤8000 rpm transient for ≤10 min., with EIP EtherNet/IP, up to 70° C
≤6000 rpm continuous operation, with EIP EtherNet/IP, up to 70° C
Moment of inertia ≤3 x 10-6 kgm2
Starting torque <0.01 Nm at 20 °C
Shaft load rating 80 N radial
40 N axial
Mounting type supported flange joint ø58 mm mounting type M1
servo flange ø58 mm mounting type M2
square flange 63.5 mm mounting type M5
Weight ~0.45 kg