Datalogic AMT58 Series, Руководство пользователя

Страница: 194 / 435

GETTING STARTED
14
AMT58...PN
Setting the resolution and the scaling function
• If you want to use the physical resolution of the encoder, please check that the
Scaling function control
parameter is disabled (=”0”), see "
Scaling function control"
on page 65
; this parameter is active only if the Class 4 functionality parameter is
enabled (=”1”), see "
Class 4 functionality" on page 64
;
• on the contrary, if you need a custom resolution, you must enable the scaling
function by setting the
Scaling function control
parameter to =”1” first and then
set the required resolution values:
- open the
Module parameters
page and set the singleturn resolution next to the
Measuring units / Revolution parameter, see "
Module parameters" on page 24
and "
Measuring units / Revolution" on page 67
;
- open the Module parameters page and set the total resolution next to the Total
measuring range
parameter, see "
Module parameters" on page 24
and "
Total mea -
suring range" on page 68
.
Reading the position
• To read the value of the absolute position use the Standard Telegram 81, see
"
Standard Telegram 81" on page 48
; see also "
G1_XIST1" on page 52
and "
G1_XIST2"
on page 53
.
Setting and executing the preset
To set and execute the preset proceed as follows:
• check that the
Control by PLC
bit 10 of the
STW2_ENC
control word is =”1”, see
"
Control by PLC" on page 55
;
• check that the
Class 4 functionality
parameter is enabled (=”1”), see "
Class 4 func -
tionality" on page 64
;
• check that the
G1_XIST1 Preset control
parameter is enabled (=”0”), see "
G1_X -
IST1 Preset control" on page 64
;
• set the preset value by means of Telegram 860 and
G1_XIST1_PRESET_VALUE
sig -
nal, see "
G1_XIST1_PRESET_VALUE" on page 54
;
• execute the preset by forcing high the
Request set/shift of home position
bit 12 in
the G1_STW control word, see "
Request set/shift of home position" on page 58
;
• the encoder replies by forcing high the
Set/shift of home position executed
bit 12
in the G1_ZSW status word, see "
Request set/shift of home position" on page 58
;
• the Master must set back to 0 the
Request set/shift of home position
bit 12 in the
G1_STW control word, see "
Request set/shift of home position" on page 58
;
NOTE
It is possible to enable the scaling function and set a custom resolution
also by entering the web server via browser (see "
Integrated Web Server"
on page 90
): in the Set Encoder Registers page (see "
Setting the Parame -
ters" on page 94
), the operator can either enter the desired value or set it
through the drop-down box in the input field under the WRITE column; then
he has to press the button between the boxes to confirm. The value that is
currently set can be found in the box on the right under the READ column.
NOTE
It is possible to read the current position of the encoder also by entering
the web server via browser (see "
Integrated Web Server" on page 90
): in
the Encoder position and speed page (see "
Encoder Position and Speed" on
page 92
), the current position of the encoder is displayed. For example, it
is “11562 in
Figure 3 on page 92
.