XAC77 Profibus-DP
®
Example
“XAC77
16/16384
PX-xx”:
•
“Hardware counts per revolution” =
16
bit/turn (2
16
= 65536 cpr)
•
“Hardware number of turns”
= 14 bit (
16384
turn)
•
“Total hardware resolution”
= 30 bit (65536
∗
16384 = 2
30
=
1073741824)
Example
“XAC77
16/16384
PX-14”
Resolution is:
•
“Hardware counts per revolution” = 65536 (2
16
)
•
“Hardware number of turns”
= 16384 (2
14
)
•
“Total hardware resolution”
= 1073741824 (2
30
)
2048 steps per revolution
∗
1024 turns are required:
•
: byte 10 = 0A hex (bit 1 = bit 3 = “1”)
•
= 2048:
byte 11…14 = 0000 0800 hex
•
= 2048
∗
1024 = 2097152: byte 15…18 = 0020 0000 hex.
NOTE
When new values are set next to the items
, new
and zero-setting values are required according to
the new resolution.
6.4.4 Byte 19
Velocity measure unit
This byte is available only when Class 2(+VEL) is set. It defines the unit of
measurement for speed value transmitted by the device.
00 = rpm (revolution per minute);
01 = step/s (steps per second).
MAN XAC77 PX I_E 1.0.odt
47
Profibus® interface
