Lika EM58 PA Series, User Manual

Page: 35 / 60

EM58 PA
Separate the integer part from the fractional part using the decimal point (.);
decimal comma is converted into decimal point.
Default = 0 (min. / max. = see the limit values of the selected output range)
EXAMPLE
Here follows an example useful to better understand the preset function and
the meaning of the related parameters and commands:
Preset
and
Activate
preset
. Let's say
Output type
= CURRENT and
Output range
= 0 – 5V.
In our example the minimum value you can set next to the
Preset
parameter is
0; the maximum value is 5.
If a
Preset value has been never set previously and anyway the Activate preset
command has been never sent, the transmitted position information and the
current position information necessarily match.
When you enter a
Preset
value and then execute the
Activate preset
command, the system saves the set preset value and use it to calculate the
position value to be transmitted.
For instance, let's suppose that we set the value “4” (V) next to the
Preset
item
and then we execute the
Activate preset
command after having stopped the
encoder at position “0,195” (V) (
Position
= 0,195; after having sent the
command by pressing the
Activate preset
button,
Position
= 4V;
Turns
=
13107; Counts/rev = 819). So we need the encoder to output the value “4” (V)
when it reaches the actual position “0,195” (V).
Thus the transmitted position values will result as follows:
If
actual encoder position
=”0,195” 
transmitted position
=
4,000 V
.
If
actual encoder position
=”0,196” 
transmitted position
=
4,001 V
.
...
If
actual encoder position
=”0,193” 
transmitted position
=
3,998 V
.
If
actual encoder position
=”0,194” 
transmitted position
=
3,999 V
.
NOTE
The settable preset values are comprised between the limits of the selected
output range.
WARNING
Check the
Preset
parameter and execute the preset function (either by means of
the
Preset
input or by pressing the
Activate preset
button) every time you
change the value next to the
Encoder HW counts
parameter available when
the options Programming mode: Prog (single ramp) or Programming mode:
Prog (cyclic ramp) are set; or after having changed the counting direction
(through the
Counting direction
input or by setting the
Positive counting
direction
parameter).
MAN EM58 PA E 1.1 Software and configuration parameters 35 of 60