Profibus user manual – BEI Sensors PHU9 Absolute Hollow Shaft Encoder User Manual
Page 20
PROFIBUS USER MANUAL
20
Preliminary
BEI IDEACOD SAS
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Octet 26 Bit 5 Lower limit switch
0
Deactivated
1
Activated
Octet 26 Bit 6 Upper limit switch
0
Deactivated
1
Activated
5.1.7 Physical impulses
This parameter is evaluated if the reference for
the „desired measuring units“ is „physical
impulses“ (cp. 5.1.3).
With the „physical impulses“ it is possible to set
a gearing factor freely. The user defines the
output steps („desired measuring steps”) over
a part of the measuring range. This option is
helpful to program scaling factors that result in
a non-integer number of steps over 1
revolution.
Example:
Problem: The position value has to increase by
400 steps over 3 revolutions.
With the reference „steps per revolution“ it is
impossible to program that scaling factor (it
would be necessary to set the parameter
„desired measuring steps“ to 133.33; this is not
possible because the parameter must be an
integer value).
Solution:
Choose „physical impulses“ as reference for
the „desired measuring units“.
Now the number of physical measuring steps
over the desired measuring range is
determined. For this the actual (physical)
Octet
31
32
33
34
Bit
31 - 24
23 - 16
15 – 8
7 - 0
Data
2
31
to 2
24
2
23
to 2
16
2
15
to 2
8
2
7
to 2
0
Upper limit switch (in measuring steps, related to the scaled value)
Octet
35
36
37
38
Bit
31 - 24
23 – 16
15 – 8
7 - 0
Data
2
31
to 2
24
2
23
to 2
16
2
15
to 2
8
2
7
to 2
0
Physical impulses