Absolute rotary encoder P**58
Encoder classes of the PROFIBUS user organisation
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
13
4 Encoder classes of the PROFIBUS user organisation
Encoder classes Class 1 and Class 2 are different versions based on the encoder
profile specified by the Encoder working group in the PROFIBUS user organisation
(available from the PROFIBUS user organisation under order number 3.062).
4.1 Parameter assignment
The following table contains an overview of parameters that can be set using the
encoder profile together with their layout in the parameter assignment telegram. Since
parameters can generally be set by means of user-friendly input masks in the
projecting tool, a detailed description of the parameter assignment telegram is
typically not of interest to users.
4.1.1 Direction of rotation
The direction of rotation defines the counting direction of the output of the actual
process value when the shaft is turning clockwise (cw) or counterclockwise (ccw) as
seen when facing the shaft. The counting direction is specified by Bit 0 in Octet 9:
Octet no. Parameter Bit no. Details
1 ... 8 PROFIBUS standard parameter
9 direction of rotation 0 section 4.1.1, page 13
class 2 functionality 1 section 4.1.2, page 14
commissioning diagnostics 2 section 4.1.3, page 14
scaling function 3 section 4.1.4, page 14
reserved 4
reserved 5
not used for Class 1 and Class 2 6
not used for Class 1 and Class 2 7
10 ... 13 measurement steps/revolution section 4.1.5, page 14
14 ... 17 overall resolution section 4.1.6, page 15
18 ... 25 reserved (according to encoder profile)
26 ... not used for Class 1 and Class 2
(see versions P+F 2.1 and 2.2)
Octet 9 Bit 0 Direction of rotation (facing the shaft) Output code
0 clockwise (cw) rising
1 counterclockwise (ccw) rising
If Class 1 is selected, only the direction of rotation can be changed by
parameter.
Note
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