FX Series Programmable Controllers Devices in Detail 4
4-37
4.12.5 Externally Adjusted Registers
The FX
0
and FX
0N
have built in “settin
pots” which are used to ad
ust the
contents of certain dedicated data
re
isters. The contents of these re
isters
can ran
e from 0 to 255. This is a built in
feature and requires no additional setup
or pro
rammin
.
The FX, FX
2C
and FX
2N(C)
do not have
this feature, however, an additional
special function unit is available which
provides the same function. For the FX
and FX
2C
the unit is the FX-8AV. For
FX
2N(C)
the unit is the FX
2N
-8AV-BD. To
use this unit requires the applied instructions VRRD function 85 (Volume Read) and VRSC
function 86 (Volume Scale).
Uses:
• This facilit
is often used to var
timer settin
s, but it can be used in an
application
where a data re
ister is normall
found, i.e. settin
counters, suppl
in
raw data, even
selection operations could be carried out usin
this option.
FX
0(S)
FX
0N
FX FX(
2C)
FX
2N(C)
Number of
setting pots
1 point 2 points
8 points: Supplied b
usin
the additional special
function block
FX-8AV or FX
2N
-8AV-BD
Number of
controlled
data registers
1: D8013
1: D8013 or
D8030,
2: D8031
Selected b
the user when applied instructions
VRRD and VRSC are used.
RUN
STOP
67
5
5
Setting pot
of an FX
0
