4.4.1 Encoder Cable Length
The maximum encoder cable length due to the voltage drop on the supply line is
calculated as follows:
Max. Encoder Cable Length =
Voltage Supply - Min. Encoder Voltage
Max. Encoder Current 2 Wire Resistor Per Meter
The supply voltage depends on the set encoder. The other values can be found in the
data sheet of the encoder and the encoder cable.
4.4.2 Description of the Encoder Interfaces
Only channel A:
Input for two sine-
Single-ended (e.g. Cos+ against GND):
Constant component 2.5 V ±0.5 V
Differential (e.g. Cos+ against Cos-):
• Constant component 0 V ±0.1 V
• Signal level Uss = 0.6 V
Channel A:
Input for square-wave incremental signals according to RS485 maximum
Channel B:
Input for square-wave incremental signals according to RS485 maximum
Incremental encoder simulation: Position changes of channel A are output
to channel B with two 90° shifted RS485 signals. Maximum output
frequency 500 kHz.
Only Channel A:
Input zero signal once per revolution.
-):
• higher 50 mV: zero signal is active
• from 50 mV to -50 mV: undefined
• lower -50 mV: zero signal is inactive
Channel A and B:
Input zero signal or data RS485.
Zero signal is 1-active, if signals A and B are also 1-active.
Only Channel B:
Output zero signal RS485.
Zero signal is 1-active, if signals A and B are also 1-active. Is output, if the
position on channel A is 0°.
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