Safety Characteristics; Further Applicable Documents; Data Transmission; Sine And Cosine Signals - Reer SAFECODER Instalación Uso Y Mantenimiento

3.3 Safety Characteristics

Service life of the encoder:
PFH value:
5 VDC versions:
10-30 VDC versions:

4. Further applicable documents

All technical data is given in the corresponding data sheets of the encoders. You will find
there the mechanical and electrical characteristics of the Safecoder.

5. Data Transmission

5.1 Sine and Cosine Signals

The analogue signals must be measured differentially, i.e. A minus
B minus gives the cosine. The signals A,
an offset of +2.5V to 0V.
Measured differentially, the sine and cosine signals have an amplitude of 1Vss, with a
phase-shift of 90°.
The resolution of the incremental track is 1024/2048 sine/cosine periods depending on
the variant.
Offset:
Amplitude:
Terminating resistor:
The validity of the safety function must be checked with the function sin²(x) + cos²(x) = 1.
The recommended tolerance range for the encoder lies between 0.5 and 1.5. However
this value must be verified with the desired safety function. Factors which must also be
considered here include the scanning frequency, the input circuitry and the calculated
evaluation of the Sin Cos signals in the controller. For this reason the manufacturer of the
controller must once again verify the tolerance limits of the sin²(x) + cos²(x) function.
4
20 years
dependent on the supply voltage of the encoder
1.08 * 10
1.09 * 10
A – = Sin; B –
Ā
2,5V +/- 50mV
Offset difference A-B max. 25mV
1Vss +/-100mV
Amplitude difference A-B max. 40mV
120 Ohm (A – ; B – )
Ā
SAFETY SINE/COSINE INCREMENTAL ENCODER
1/h
-8
1/h
-8
= Cos
, B, each have an amplitude of 0.5Vss with
Ā
gives the sine,
Ā
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