Lenze 8400 TopLine - Manual (Page 344)

6 Encoder/feedback system
6.3 Multi-Encoder (X8)
344
Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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Scaling of the position value
In order to scale the position change provided by the position encoder at this feed to 65536 as well,
enter the traverse path in [units] in C1111/1 and the corresponding difference of the raw value
provided by the encoder in C1111/2 .
• Only the bits that contain the position data may be taken from the data word for the raw value.
If e.g. the bit 0 contains status information, the raw value must be shifted to the right by this bit
since only then the SLB of the position value is positioned correctly.
Example for scaling
1 [unit] = 1 mm
Feed constant (
C01204 ) = 4 mm/revolution
Encoder resolution = 50 μm  raw value difference = 20 [digit]/1 [unit]

Difference - traverse path ( C1111/1 ) = 1 [unit]
 Difference - encoder value ( C1111/2 ) = 20 [digit]
Thus, at a feed of the mechanics of 4 mm, the encoder provides a position difference of 65536
increments.
Position Raw value Encoder feed constant
65536
---------------------------------------------------------
⋅
=
with encoder feed constant
C01111/1 65536
2
⋅
C01111/2 C01204 ⋅
-------------------------------------------------- =
Position Raw value C01111/1 65536
⋅
C01111/2 C01204 ⋅
-------------------------------------------------- ⋅
=