Motrona - IT251 Impulse Divider For incremental encoders - single ended or quadrature signals TTL/HTL

Model Numbers

IT251 DIN Rail Mount Encoder Impulse Divider


  • Level conversion from TTL / RS 422 to HTL 10 ... 30 V and vice versa 
  • Programmable divider for error- free and position-true division of quadrature encoder Signals (A / B / 90°) 
  • Separate marker pulse divider with individual settings 
  • 300 kHz of maximum frequency 
  • Push-pull outputs for direct PLC interfacing 
  • Single 18 ... 30Vdc supply
  • Impulse and frequency divider for incremental encoder signals
  • Error-free division of quadrature encoder signals, with adjustable ratio from 1:1  to 1:4096,  with separately adjustable divider for marker pulse
  • Level converter for incremental encoder signals A/B/Z to both directions 
    (TTL / RS422 to HTL and HTL to TTL / RS422, see drawing)
  • Includes also translation between various modes of indication of the direction of rotation
  • Max. input frequency 300 kHz
  • Power supply 18 - 30 VDC
  • Compact housing for DIN rail mounting


Circuit Diagram

IT251 Encoder Splitter Circuit Diagram

Ordering Information

SPLITTER MODEL  Inputs  Outputs 
IT 251 

2 Inputs A, /A, B, /B, Z, /Z

Input Level RS422 / TTL or HTL (individually selectable)

2 Ouputs Each A, /A, B, /B, Z, /Z

Output Level RS422 / TTL or/ HTL (individually selectable)