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Catalogue Catalog AS-interface

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Multiturn absolute encoder

BVM14

A memory command would thus only take effect for slave A. The command would not take effect for slaves that were already read until the next read cycle. Data consistency would be lost because of the change of order.

Temporary storage and transfer with flag bits

If individual telegrams of the four slaves to the AS-Interface master suffer interference, it may happen in spite of temporary storage in the angular encoder that the data that are transferred to the control module do not all originate from the same position data set.

Transferring one flag bit for each slave makes it possible for the control module to check which position data set an individual

data set belongs to by comparing the four flag bits. Data bit D2 is used for this purpose.

Example:

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	Slave A Data bit D2	Position data
Cycle	Slave A Data bit D2	Slave A	Slave B	Slave C	Slave D
1	0	XXX0	XXX0	XXX0	XXX0
2	1	XXX1	XXX1	XXX1	XXX1
3	0	XXX0	XXX0	XXX0	XXX0
4	1	XXX1	XXX1	XXX1	XXX1
etc.

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Bit D2 is influenced by the control module. Bit 4 of the input data corresponds to the value of this bit for each slave.

D2 is set to 0 in cycle 1. If the value of bit 4 of a slave were "1", that value would be derived from another cycle. This is a simple

way to recognise data consistency.

Transferring the flag bits, however, reduces the usable position data from 13 bits to 12. Masking out the fourth bit of each slave increases slightly the effort of putting together the position data set in the control module.

Resolution of the rotary professional encoder


	Without flag bits				With flag bits
	Number of rotations	Bits	Steps per revolution	Bits	Number of rotations	Bits	Steps per revolution	Bits
	8	03	8192	13	not allowed
Possible	16	04	4096	12	2	01	2048	11
combinations of	32	05	2048	11	4	02	1024	10
steps per	64	06	1024	10	8	03	512	09
revolution and	128	07	512	09	16	04	256	08
number of rotations	256	08	256	08	32	05	128	07
	512	09	128	07	64	06	64	06
	1024	10	64	06	128	07	32	05
	2048	11	32	05	256	08	16	04
	4096	12	16	04	512	09	8	03

Order code

BVM1 4-123 B -

Number of revolutions

(Combinations see table)

Steps per revolution

(Combinations see table) Connection type

3 Cable 011.2 mm, 8-core and protective conductor, 2 m

Principle of operation

M Multiturn Shaft version V Solid shaft Data format

B AS-Interface

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Subject to reasonable modifications due to technical advances.

Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com 305