FX Series Programmable Controllers Devices in Detail 4
4-34
4.12.5 Externally Adjusted Registers
The FX
1S and FX1N have built in “setting
pots” which are used to adjust the
contents of certain dedicated data
registers. The contents of these registers
can range from 0 to 255. This is a built in
feature and requires no additional setup
or programming.
The FX
2N and FX2NC do not have this
feature, however, an additional special
function unit is available which provides
the same function. The unit required is
the FX
2N-8AV-BD. For use, this unit
requires the applied instructions VRRD
function 85 (Volume Read) and VRSC function 86 (Volume Scale).
Uses:
• This facility is often used to vary timer settings, but it can be used in any application
where a data register is normally found, i.e. setting counters, supplying raw data, even
selection operations could be carried out using this option.
FX1S FX1N FX2N FX2NC
Number of
setting pots
2points,
plus 8 points: Supplied by using
the additional special function
board
FX
2N-8AV-BD
8 points: Supplied by using the
additional special function board
FX
2N-8AV-BD
Number of
controlled
data registers
1: D8030
2: D8031
Additional 8 points selected by
theuserwhenapplied
instructions VRRD and VRSC
are used.
Selected by the user when
applied instructions VRRD and
VRSC are used.
RUN
STOP
Setting pot
of an FX
1S
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