Lika LD25 Series, Руководство пользователя, Страница: 29 / 44

LD25x
8.3 Scaling of the display
Under consideration of the scaling parameters which have been described
previously, the final display value of the unit will result from:
DISPLAY [Encoder SSI Data] [0-Position]
= - x
{ }
M-Factor
D-Factor
+/-
P-Factor
NOTE
•
Encoder SSI data are always positive only. When also negative values
should be indicated, this can be achieved by corresponding setting of
the parameters
0-PoS
or
P FAc
(see section “7.2 Operational
parameters” on page 16).
•
The LED display provides 6 decades. For this reason all parameter
settings (including
0-PoS
) are also limited to a maximum range of 6
decades. SSI encoders having a resolution of more than 19 bits will
however generate SSI data with more than 6 decades. In such a case it
can become difficult to set the
0-PoS
value and the other scaling
parameters while the mechanical encoder position is in the overflow
zone (the unit would insistently display
"overflow"
). To avoid this kind
of problem with encoders of more than 19 bits, we recommend to use
the “Bit Blanking” function and evaluate 19 bits only (see section “8.2
Evaluation of encoder bits” on page 28).
•
If you intend to use the "Round Loop" function later (see
r-LooP
parameter in the section “7.2 Operational parameters” on page 16 and
section “8.4.2 “Round-Loop” function” on page 32), it is mandatory to
blank all unused bits.
•
Remote Reset/Set commands via keyboard or external input will
overwrite the current value of parameter
0-PoS
by the actual SSI
position of the encoder. Therefore, in the formula above, the content
between the brackets { } will become zero and the unit will display the
same value as set to parameter
P FAc
. This scaling is also automatically
stored to the Flash Prom for full data retention in power-down state.
MAN LD25x E 1.0.odt Hints for application 29 of 44