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Compact hollow shaft rotary encoder with SSI and IO-Link
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The WH3650M rotary encoder is an absolute magnetic single- and multi-turn rotary encoder, which impresses with its extremely compact design. It is particularly robust and resistant to vibrations.  Thanks to its high degree of protection up to IP67 and a temperature range of -40° C … +85° C, it is also suitable for demanding industrial applications. The particularly small design with a diameter of only 36 mm predestines the rotary encoder for use in applications with limited installation space. Thanks to the IO-Link and SSI interfaces, it is ready for Industry 4.0 and ideally suited for point-to-point communication in automation networks.

  • absolute wear-free magnetic encoder
  • Multiturn without gearbox and without battery
  • Interface SSI, IO-Link
  • extremely compact and very robust design
  • IP67 protection class
  • extensive temperature range -40 … 85° C
  • optimal price-performance ratio
  • Industry 4.0 ready

Mechanical data

Feature Technical data Additional information
Shaft rustproof stainless steel  
Flange Aluminium  
Housing zinc die-casting  
Speed 6000 rpm with protection class IP65, transient for ≤10 min
  3000 rpm with protection class IP65, continuous operation
  4000 rpm with protection class IP67, transient for ≤10 min
  2000 rpm with protection class IP67, continuous operation
Starting torque <0.007 Nm with protection class IP65
  <0.01 Nm with protection class IP67
Shaft load rating 40 N radial
  20 N axial
Cable sheath PUR ø6.2 ±0.2 mm, with IO-Link
  PUR ø5.5 ±0.2 mm, with SSI
Cable bending radius 60 mm static, with IO-Link
  130 mm dynamic, with IO-Link
  45 mm static, with SSI
  65 mm dynamic, with SSI
Mounting type stator coupling mounting type DS1
  spring element mounting type DS2
Weight ~0.2 kg  

Electrical data

IO-Link interface

Feature Technical data Additional information
Operating voltage 18 … 30 V DC reverse-polarity protected
Current consumption ≤30 mA  
Power input ≤300 mW without load
Parameter storage 104 cycles also applies to calibration operations
Interface IO-Link Version 1.1 according to IEC 61131-9
Parameter SIKO Standard Profile IOL
  Smart Sensor Profile IOLssp
Type of connection 1x M12 connector (A-coded) 4-pole, 1x pin, E12E connection type

SSI interface

Feature Technical data Additional information
Operating voltage 10 … 30 V DC reverse-polarity protected
Current consumption ≤40 mA without load
Power input ≤300 mW without load
Parameter storage 104 cycles also applies to calibration operations
Digital inputs 2 calibration inputs, rotation direction. Both inputs active at high (comparator).
Input signal level high ≥60 % from +UB  
Input signal level low ≤30 % from +UB  
SSI clock speed input 50 kHz … 2 MHz  
Monoflop time ≤15 µs  
Interface SSI line driver according to RS485
Cycle time 2 ms  
Type of connection 1x M12 connector (A-coded) 8-pole, 1x pin, E12E connection type
  open cable end E1 connection type

System data

Feature Technical data Additional information
Scanning magnetic  
Resolution 12 bit single-turn, 4096 steps/rotation, only with SSI
  13 bit single-turn, 8192 steps/rotation, only with SSI
  14 bit single-turn, 16384 steps/rotation
System accuracy ±1°  
Repeat accuracy ±0.2°  
Measuring range 1 revolution(s) single-turn
  4096 revolution(s) 12 bit, only with SSI
  65536 revolution(s) 16 bit, only with SSI
  262144 revolution(s) 18 bit, only with IO-Link
  16777216 revolution(s) 24 bit, only with SSI

Ambient conditions

Feature Technical data Additional information
Ambient temperature -40 … 85 °C  
Storage temperature -40 … 85 °C  
Relative humidity 93 % condensation inadmissible
EMC DIN EN 61326-1 immunity requirement of industry
  DIN EN 61000-4-2, -3, -6, -8 interference resistance / immission
  DIN EN 61000-4-4 burst
  DIN EN 61000-6-2 interference resistance / immission
  DIN EN 61000-6-4 emitted interference / emission
  DIN EN 55011 Class A radiation emission / radio interference suppression
Protection category IP65 EN 60529
  IP67 EN 60529
Shock resistance 2500 m/s2, 6 ms EN 60068-2-27
Vibration resistance 300 m/s2, 10 … 2000 Hz EN 60068-2-6

Ordering table

Feature Order data Specifications Additional information
Interface/protocol

AIOL

 IO-Link SIKO Standard Profile  

IOLssp

 IO-Link Smart Sensor Profile  

SSIb

 SSI, binary  

SSIg

 SSI, Gray  
 
Steps per revolution

B4096

 12 bit  

8192

 13 bit  

16384

 14 bit  
 
Number of revolutions

C1

 singleturn  

4096

 12 bit, multiturn  

65536

 16 bit, multiturn  

262144

 18 bit, multiturn  

16777216

 24 bit, multiturn  
 
Hollow shaft/diameter

D6

 ø6 mm  

8

 ø8 mm  

10

 ø10 mm  

1/4

 ø1/4 in  
 
Mounting type

EDS1

 stator coupling  

DS2

 spring element  
 
Protection category

FIP65

 IP65  

IP67

 IP67  
 
Position of electrical connection

GA

 axial  

R

 radial  
 
Type of connection

HE1

 open cable end  

E12E

 plug  
 
Cable length

I...

 01.0, 02.0, 03.0, 05.0, 10.0 in m only with connection type E1

OK

 without cable only with connection type E12E
 

Ordering key

WH3650M-A-B-C-D-E-F-G-H-I-S

For more information, click here!

Data sheet

Pin assignment

SSI, E12E

Signal PIN
GND 1
+UB 2
SSI cycle + 3
SSI cycle - 4
SSI data + 5
SSI data - 6
Calibration input 7
Rotational direction 8

IO-Link, E12E

Signal PIN
L+ (+UB) 1
nc 2
L- (GND) 3
C/Q 4

SSI, E1

Signal Color
GND white
+UB brown
SSI cycle + green
SSI cycle - yellow
SSI data + gray
SSI data - pink
Calibration input blue
Rotational direction red

Industry 4.0

In most cases, data exchange with the absolute rotary encoder is limited to the exchange of process data. In addition to the process data, the rotary encoder provides additional information with an IO-Link interface that can be evaluated for condition monitoring up to predictive maintenance:

Process Data Smart Value Smart Function
Actual position Temperature Condition monitoring
Speed Limit speed Application overload
  Operation hours counter Operating time
  Acceleration events Activation of PLC functions
  Speed events Activation of PLC functions
  Electronic type label Asset management

Scope of delivery

  • Quick Start Guide
  • WH3650M