Datalogic AMT58 Series, Manual

Page: 426 / 435

AMT58x-PB Profibus®
27
WARNING
When you set a new value next to the
Total resolution item, please
always check also the Counts per revolution item value and be
sure that the resulting number of revolutions complies with the
Hardware number of revolutions of the device.
Let's say our encoder is programmed as follows:
Counts per revolution : 8192
Total resolution = 33554432
10
= 8192 (cpr) * 4096 (rev.)
Let's set a new total resolution, for instance: Total resolution = 360.
As the Total resolution must be greater than or equal to the Counts
per revolution , the above setting is not allowed. When this happens,
the encoder falls into an error signalling the faulty condition through
the diagnostic LEDs (see on page 12).
Example
“HS5818/FB-xx”: singleturn encoder

Hardware counts per revolution = 18 bit/turn (2
18
= 262144 cpr)

Hardware number of turns = 1

Total hardware resolution = 18 bit (262144

1 = 262144)
“HM5816/16384/FB-xx”: multiturn encoder

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
Multiturn encoder “HM5816/16384/FB-6” with “BC-PB-C“ connection
cap.
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:

Enable Scaling function control : byte 10=0A hex (bit 1=bit 3=“1”)

Counts per revolution = 2048: byte 11…14 = 0000 0800 hex

Total resolution = 2048

1024 = 2097152: byte 15…18 = 0020
0000 hex.
NOTE
When new values are set next to the items
Counts per revolution
and/or Total resolution , a new Preset value and zero-setting values
are required according to the new resolution.