KEB COMBIVERT F6 Programming Manual

Interface to the encoder
© 2022 KEB Automation KG
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6.1.3.1 Resolver
The position determined by the encoder is resolved with 13 bit, one revolution cor-
responds to:
• 1 revolution = 2
13
= 8192
6.1.3.2 Encoder with rectangular incremental signals (TTL and HTL)
A signal period contains 4 edges, which are counted.
The resolution corresponds to 4-fold of the number of pulses per revolution
• 1 revolution = ec29 ∙ 4
6.1.3.3 Encoder with sine-wave 1Vss signals (Endat+1Vss, SinCos-SSI, Hiperface, Sin-Cos)
The position is always determined from the 1Vss signals for these encoders.
Additionally to the counting of the traversed sine periods, also the position within
one sine period is evaluated.
Since this high resolution is 13 bit, one revolution corresponds to:
• 1 revolution = ec29 ∙ 2
13
= ec29 ∙ 8192
If these encoders have additional absolute information (digital or analog), this is
only used to monitor the incrementally counted position (=> see 6.1.2.1 Absolute
encoder).
The resolution of this absolute information is independent of the resolution of the
position from the 1Vss signals. Typically, it is also significantly lower.
Example:
The key data of an Endat encoder are specified in the catalogue with:
- "increments per revolution = 512"
- "Positions/U = 2048 (11 bit)"
If this encoder is evaluated with ec16 = 10 " Endat + 1Vpp", corresponds to one
revolution:
• 1 revolution = ec29 ∙ 2
13
= 512 ∙ 8192 = 2
9
∙ 2
13
= 2
22
= 4194304
The position here is resolved with 22 bit, although the resolution of the absolute po-
sition, which is read out via the serial Endat communication is only 11 bit ("posi-
tions/U").
6.1.3.4 Digital encoder (EnDat digital, BiSS, SSI)
Since the position value is directly read out for digital encoders, the resolution of
the detected position is also equal to the resolution of this serial position value.
For encoders with electronic type plate (Endat and partly also BiSS), the serial po-
sition is automatically read out without additional parameter settings. Therefore the
resolution is indicated in the data sheets of the encoder manufacturer.
For evaluation of the Endat encoder from the previous example, the position within
one revolution has a resolution of 11 bit at ec16 = 10 "Endat digital".

KEB COMBIVERT F6 Specifications

General

Brand	KEB
Model	COMBIVERT F6
Category	Controller
Language	English