Variable position interface
Function description 83
Version: 1.5
19 Variable position interface
Note
Reference values for the variable position interface:
S-0-0051; S-0-0053; S-0-0079
If the AX5000 is to transfer a single-turn position with a resolution of more than 20 bits to the controller, the
variable position interface must be used.
The position of the axis is recorded in the AX5000 and handed over to the controller in S-0-0051 with a data
length of 32 bits. Parameter S-0-0079 (Position Resolution) now specifies how many of these 32 bits are
used for the single-turn range in S-0-0051* (Position feedback value 1). The remaining bits form the variable
multi-turn range.
*This function also exists in S-0-0053 (Position feedback value 2).
19.1 Functionality from firmware v2.10
From AX5000 firmware v2.10 S-0-0079 is writeable and can be parameterized between 2
20
bits and 2
30
bits.
The single-turn position length in S-0-0051 and S-0-0053 can thus be set from 20 to 30 bits. That results in
the multi-turn position length with 12 – 2 bits. Note that both ranges always change. If the single-turn
resolution is increased, the maximum multi-turn count value is reduced.
Captions
Yellow area = variable range
Grey area = permanently assigned
range
MT = Multi-turn range
ST = Single-turn range
Commissioning
Parameter S-0-0079 (Position Resolution) can be
adjusted via the TC Drive Manager. To do this, go to
the corresponding (controller) channel →
Configuration → Scaling and NC parameters.
This value (data length) can be manually set by the
user in the TC Drive Manager.
The default value for parameter S-0-0079 is 1048576
(2
20
) and corresponds to a 20-bit single-turn range.
If parameter S-0-0079 is changed via the TC Drive Manager, the changes necessary for NC take place
automatically.
The following values are then changed in the NC axis under the object Enc (Encoder):
• Scaling Factor Denominator
• Encoder Sub Mask
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