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XAC80 Profibus-DP
®
EXAMPLE
“XAC80 18/1 ”: singleturn encoder

Hardware counts per revolution
=
18
bits/turn (2 18 = 262 144 cpr)

Hardware number of turns = 1

Total hardware resolution
= 18 bits (262 144

1 = 262 144)
“XAC80
16/16384
”: multiturn encoder

Hardware counts per revolution
=
16
bits/turn (2
16
= 65,536 cpr)

Hardware number of turns
= 14 bit (
16,384
turn)

Total hardware resolution
= 30 bits (65,536

16,384 = 2
30
= 1 073
741 824)
EXAMPLE
Multiturn encoder “XAC80
16/16384
”.
The resolution is:

Hardware counts per revolution = 65,536 (2 16 )

Hardware number of turns
= 16,384 (2 14 )

Total hardware resolution = 1 073 741 824 (2 30 )
2,048 steps per revolution

1,024 turns are required:

Enable the scaling function (
Class 2 functionality
= 1;
Scaling function
control = 1); byte 10 = 0A hex (bit 1 = bit 3 = “1”)

Custom resolution per turn =
Counts per revolution
= 2,048 cpr; bytes 11
… 14 = 0000 0800 hex

Total resolution = 2,048

1,024 = 2 097 152: byte 15 … 18 = 0020 0000
hex.
NOTE
When new values are set next to the
Counts per revolution
and/or
Total
resolution
parameters, a new
Preset value
setting is required according to the
new resolution.
7.4.4 Byte 19
Velocity measure unit
This byte is available only when Class 2 (+VEL) is set (see also
Class 2
functionality and Exchange type items).
It defines the unit of measurement for the speed value transmitted by the
device.
00 = step/s (steps per second);
01 = rpm (revolutions per minute).
Default = 0 (min. = 0, max. = 1)
MAN XAC80 PB E 1.0.odt 7 - Profibus® interface 48 of 60