Rotary Encoders - DR. JOHANNES HEIDENHAIN GmbH - #49

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49 Pin layout 12-pin M23 coupling 12-pin M23 connector 15-pin D-sub connector for IK 215 Power supply Incremental signals Other signals 12 2 10 11 5 6 8 1 3 4 9 7 / 4 12 2 10 1 9 3 11 14 7 5/6/8/15 13 / UP Sensor UP 0 V Sensor 0 V A+ A– B+ B– R+ R– Vacant Vacant Vacant Brown/ Green Blue White/ Green White Brown Green Gray Pink Red Black / Violet Yellow Shield on housing; UP = Power supply voltage Sensor: The sensor line is connected in the encoder with the corresponding power line Electrical connection Input circuitry of the subsequent electronics Dimensioning Operational amplifi er MC 34074 Z0 = 120 - R1 = 10 k- and C1 = 100 pF R2 = 34.8 k- and C2 = 10 pF UB = ±15 V U1 approx. U0 –3dB cutoff frequency of circuitry Approx. 450 kHz Approx. 50 kHz with C1 = 1000 pF and C2 = 82 pF The circuit variant for 50 kHz does reduce the bandwidth of the circuit, but in doing so it improves its noise immunity. Circuit output signals Ua = 3.48 VPP typically Gain 3.48 Monitoring of the incremental signals The following thresholds are recommended for monitoring of the signal level M: Lower threshold: 0.30 VPP Upper threshold: 1.35 VPP Incremental signals Reference-mark signal Ra < 100 -, typically 24 - Ca < 50 pF ÓIa < 1 mA U0 = 2.5 V ± 0.5 V (relative to 0 V of the power supply) Encoder Subsequent electronics