Operating Manual SSI-BOX PROFIBUS-DP (PNO)
ELECTRONIC GmbH
TR - ELECTRONIC GmbH,
Global Quality Management, Eglishalde 6, 78647 Trossingen, Tel. ++49 (0)7425-228-0, Fax ++49 (0)7425-228-33
Date: 25.04.2012
TR - E - BA - GB - 0013 - 03
Page 31 of 45
3.7 Preset adjustment
In mode "class-2" and "Box+rotary encoder TR Gear" the PROFIBUS can be used to
adjust the SSI-BOX to any position value within a range of 0 to (measuring length in
increments - 1).
This is done by setting the most significant bits of the output data (2
31
for configuration
Class 2 - 32 bits or 2
15
for configuration Class 2 - 16 bits).
Outputs
Data byte 3
Data byte 2
Data byte 1
Data byte 0
LSB
MSB
Output byte x+0
Output byte x+1
Output byte x+2
Output byte x+3
P
Inputs
Data byte 3
Data byte 2
Data byte 1
Data byte 0
LSB
MSB
Input byte x+0
Input byte x+1
Input byte x+2
Input byte x+3
The preset adjustment value transferred in data bytes 0 - 3 is accepted as the position
value with the leading edge of bit 32 (=bit 7 of data byte 3). The SSI-BOX then
continues counting from this position. A readjustment is not possible until the control
bit has been reset again.
This process is not acknowledged via the inputs.
3.8 SSI interface
The SSI-BOX has a separate Synchronous Serial Interface without checksum via
which its position value can be made available to a further evaluation unit (e.g. drive
controller).
The position value output at this interface is identical to the value output on the
PROFIBUS from the point of view of conversion and code sequence.
