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Cable lengths for absolute encoders



Cable length: the following maximum cable lengths are recommended, depending on the output circuitry and any noise sources present:

Interface and output circuit

max. cable length

Connected to

Parallel CMOS/TTL

2 m

SPS / IPC (1)

Parallel push-pull

100 m

SPS / IPC (1)

SSI

bis zu 1000 m*

SPS / IPC (1)

RS 422 /RS 485

1000 m

SPS / IPC (1)

Analogue 4 ... 20 mA

200 m

 

Annotations:

  • Depending on the application the max. allowed cable length can be shorter, especially in areas with strong electrical noise.
  • Always use shielded cables.
  • The core diameter of the signal cores should be ≥ 0.14 mm².
  • The core diameter of the voltage supply cores should be large enough depending on the cable length, that the voltage supply of the encoder is high enough and the signals do not go below the minimum levels!
  • We strictly recommend the use of the cable types written down in the accessories.
(1) IPC = Industrial PC
(2) Depends on clock frequency: at 100 kHz Lmax approx. 250 m; at f = 250 kHz Lmax approx. 50 m

 

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