BEI Sensors PHU9 Absolute Hollow Shaft Encoder - Manual (Page 12)

PROFIBUS USER MANUAL
12 Preliminary
BEI IDEACOD SAS
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4.1.1 Code sequence
The parameter „code sequence“ defines the
counting direction of the position value. The
code increases when the shaft is rotating clockwise (CW) or counter-clockwise (CCW)
(view onto the shaft). The code sequence is
defined in bit 0 of octet 9:
Octet 9 Bit 0 Direction of rotation when viewing the
shaft Code
0 Clockwise (CW) Increasing
1 Counter-clockwise (CCW) Increasing
In Class 1 this is the only parameter that can be set.
4.1.2 Class 2 functionality
Using this switch Class 2 encoders can be
restricted to the functionality of Class 1, i.e. the
scaling parameters are disabled. To use the
class 2 functionalities bit 1 in octet 9 has to be
set.
4.1.3 Commissioning diagnostics
This function has no significance for the BEI
IDEACOD encoder.
4.1.4 Scaling function
The parameter „scaling function“ enables the
scaling parameters „resolution per revolution“
and „total resolution“. This switch should
always be activated if functions of class 2 (or
even higher classes BEI IDEACOD 2.1 and BEI
IDEACOD 2.2) are to be used.
4.1.5 Measuring units per revolution
The parameter „measuring units per
revolution“ is used to program a desired
number of steps over one revolution. If the
value exceeds the basic (physical) resolution
of the encoder, the output code is no longer
in single steps. Starting with generation “B1”
the encoder indicates a parameter error (LED)
and it will not enter the data exchange mode.
With high resolution encoders it may be
necessary to divide the value into high and
low word (depending on the software tool),
refer to page 34.
Octet
10 11 12 13
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
Desired measuring units per revolution
Octet 9 Bit 1 Class 2 functionality
0
Switched off
1 Switched on
Octet 9 Bit 3 Scaling function
0 Switched off
1 Switched on