Absolute rotary encoder P**58
Manufacturer specific encoder classes
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Date of issue 01/15/04
22
Example:
Problem: The rotary encoder must generate 400 steps over 3 revolutions.
This number of steps cannot be set with the "Desired measurement steps per
revolution" reference (the "Desired measurement steps" would have to contain the
value 133,333 but only whole numbers can be entered in this case).
Solution:
"Physical measurement steps" is selected as a reference for the desired number of
steps.
The number of physical measurement steps over the desired measurement range is
determined based on the actual (physical) resolution of the device (see the
manufacturer's rating plate). For an absolute encoder with a standard resolution of 12
bits, for example, this would be
4,096 steps/revolution x 3 revolutions = 12,288 steps in this case
This value is then entered as the "Physical measurement steps" parameter and the
actual number of steps desired, 400, is entered under "Desired measurement steps".
The rotary encoder now generates 400 steps for a measurement range of 12,288
physical steps (i. e. for 3 revolutions).
5.1.8 Rotary encoder type
The type of rotary encoder (singleturn or multiturn) is specified in Bit 1 of Octet 39.
This happens automatically if the encoder class is selected. The user only needs to
make note of this parameter if parameter assignment is made directly in hexadecimal.
5.1.9 Unit of measure for speed
You can use this parameter to adjust the unit for speed output (Class P+F 2.2). This
base value will be stored in Bits 4 and 5 of Octet 39.
For many projecting tools, the value must be divided up into high word
and low word; for more information see also section 7.4, page 34
Octet 39 Bit 1 Type
0 singleturn
1multiturn
Unit Bit 4 Bit 5
steps/second 0 0
steps/100 ms 1 0
steps/10 ms 0 1
revolutions/minute 1 1
Note
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