FOC signal transmission for SSI + HTL/TTL (up to 400 kHz)

Accessories – electronic

  • Module set (transmitter FO-TX-4 + decoder FO-DX-4) for absolute values (SSI) and incremental signals (HTL or TTL)
  • Extremely fast and highly precise FOC signal transmission up to 1000 m (patent pending)
  • Designed for highly dynamic control of drives, including motor commutation
  • Just one fiber optic cable carries all data, integrated monitoring
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The speedsters for absolute values and incremental signals

Comprising the FOC transmitter FO-TX-4 and the FOC decoder FO-DX-4, the innovative module set operates extreme quickly, highly precise and completely interference-free. It transmits incremental signals (HTL or TTL) as well as absolute values (SSI). These high-performance FOC modules always prove their value as powerful team players when high frequencies are demanded of the SSI encoder to ensure reliable and robust drive control, for example, motor commutation in mining or steel industry applications. In combination with the SSI absolute encoders ASS(H) 40 or ASSH 60 (equipped with an additional incremental output), the FOC modules FO-TX-4 and FO-DX-4 also guarantee interference-free and fast signal transmissions in those environments up to 1000 m, even at clock frequencies >2 MHz. All data is transmitted along one fiber optic cable, whose performance is monitored continuously by means of integrated cable break and status monitoring. 

Technical Data

AttributeValue
Product usage

Implement FOC transmission path (1 FOC cable) for very fast and dynamic control processes (absolute + incremental)

Supply voltage

12-30 VDC

Signal input

Transmitter FO-TX-4
 

Signal input (from encoder): 

  • Absolute SSI: DATA, DATAG, STATUS
  • Incremental: 0°, 90°, N, STATUS; each with inverted signals
     

Signal transmission (outputs transmitter module):

  • Optical (to decoder): Fiber optic 62.5/125 µm or 50/125 µm with ST connectors. All data transmitted via a single fiber optic cable 
  • Electrical (to absolute encoder): SSI clock frequency CLK, CLKG
     

Signal level:

  • Absolute SSI: RS 422
  • Incremental (configurable via DIP switches):
    • HTL differential
    • HTL single-ended
    • RS 422 
    • TTL single-ended
Signal output

Decoder FO-DX-4
 

Signal output (to controller): 

  • Absolute SSI: DATA, DATAG, STATUS, STATUSG
  • Incremental: 0°, 90°, N, STATUS; each with inverted signals
     

Signal transmission (inputs decoder module):

  • Optical (from transmitter): Fiber optic 62.5/125 µm or 50/125 µm with ST connectors. All data transmitted via a single fiber optic cable 
  • Electrical (from controller): SSI clock frequency CLK, CLKG
     

Signal level:

  • Absolute SSI: RS 422
  • Incremental (selectable via a variety of module types):
    • HTL differential (FO-DX-4 H)
    • TTL, RS 422  (FO-DX-4 T)
Frequency range

Transmitter FO-TX-4:

  • Incremental: Up to 400 kHz (1 MHz for RS 422)
  • Absolute SSI (transmitter as master for SSI absolute encoder),
    preset ex works (adjustments on request):
    • 3.67 MHz (CLK frequency) 
    • Timeout 2 µs
    • Resolution 13 bit (12-30 bit)

 

Decoder FO-DX-4:

  • Absolute SSI (controller as master for decoder),
    preset ex works:
    • 2 MHz (CLK frequency)
    • Timeout 20 µs
    • Resolution 13 bit (adjustments on request: 12-30 bit)
Casing

FO-TX-4 / FO-DX-4: Electronic housing for standard mounting rails

Dimensions

FO-TX-4 / FO-DX-4: 25 x 122 x 117 mm

Device temperature range

-20 °C to +70 °C

Degree of protection

FO-TX-4 / FO-DX-4 (for switchboard): IP20

Electrical connection

FO-TX-4 / FO-DX-4: Terminal strips and FOC connector to outside of module

Device options
  • Constant throughput time <1 µs (transmitter input to decoder output)
  • Very high sampling rate; incremental signal jitter <15 ns
  • Very high SSI clock frequencies >2 MHz in combination with SSI absolute encoders ASS(H) 40/60
  • FOC range up to 1000 m
  • Integrated cable break and status monitoring
Mechanical options

-

Special features and certificates

New transmission technology – patent pending 

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