Quatech INTERBUS S manual Terminal Configuration

Terminal Configuration:

Input	Type
Signal D+ and Signal D-	Input, RS422
Signal Cl+ and Signal CL-	Output, RS422
+24 V DC	Input
0 V DC	Input

Function

Positional data from encoder, Graycode.

Clock signal output for communications interface.

24 V DC supply voltage to module, field connection.

0 V DC supply voltage return to module, field connection.

The use of this module in conjunction with a SSI encoder provides direct positional information rather than the type of data resultant from incremental type encoders. Absolute encoders are comprised of several data disks which generate a data word which is unique through out the 360 degrees of rotation. The data format

is a modified binary pattern in either Graycode or Dualcode.

The resolution of the sensor depends upon the configuration of the sensor and the physical number of revolutions in the motion profile. Since the basis of the encoder is to provide absolute positional information based upon a mechanical configuration limited to one revolution or less. The maximum resolution of this module is 24 bit.

The frequency of the data signal input to the SSI module is maintained at 125 kHz. Listed below are the recommended cable lengths for the various clock signal Baud rates.

Baud rate

100kHz

200kHz

300kHz

400kHz

Maximum cable length

400meters

200meters

100meters

50meters

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