Device description / start-up
©
TR-Electronic GmbH 1997, All Rights Reserved
Printed in the Federal Republic of Germany
Page 30 of 45
TR - ECE - BA - GB - 0009 - 08
03/04/2010
3.9 Preset adjustment
WARNING !
Risk of injury and damage to property by an actual value jump when the
adjustment function is performed!
•
The adjustment function should only be performed when the measuring system is
at rest, otherwise the resulting actual value jump must be permitted in the
program and application!
In 'Class 2' mode and in the 'TR - operation modes', the PROFIBUS can be used to
adjust the encoder 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).
To suppress interference, however, the new position value is only carried out if the
control bit 32 is present without interruption during the entire response time of 30 ms.
A re-adjustment is not possible until the control bit has been reset again and a filter
time of 30 ms has been waited.
In the Class 2 mode this process is not acknowledged via the inputs.
In the TR - operations modes at status switched-on (see adjustments of the
Commissioning function) this process is acknowledged via the most significant bit.
