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Points Of Technique 10
10-1
10. Points Of Technique
10.1 Advanced Programming Points
The FX famil
y
of pro
g
rammable controllers has a ver
y
eas
y
to learn, eas
y
to use instruction set
which enables simple pro
g
rams to perform complex functions. This chapter will point out one
or two useful techniques while also providin
g
the user with valuable reference pro
g
rams.
If some of these techniques are applied to user pro
g
rams the user must ensure that the
y
will
perform the task or operation that the
y
require. Mitsubishi Electric can take no responsibilit
y
for
user pro
g
rams containin
g
an
y
of the examples within this manual.
Each pro
g
ram will include a brief explanation of the s
y
stem. Please note that the method of
'how to pro
g
ram' and 'what parameters are available' for each instruction will not be discussed.
For this information please see the relevant, previous chapters.
10.2 Users of DC Powered FX Units
When usin
g
DC powered FX pro
g
rammable controllers, it is necessar
y
to add the followin
g
instructions to the be
g
innin
g
of the installed pro
g
ram:
Explanation:
With AC powered FX pro
g
rammable controllers, the power break detection period can be
ad
j
usted b
y
writin
g
the desired detection period to the special data re
g
ister D8008.
However, in the case of DC powered units this detection period must be set to 5 msec.
This is achieved b
y
movin
g
the value of -4 into D8008. Failure to do this could result in inputs
bein
g
missed durin
g
the DC power 'drop'.
M8000
MOV
K -4 D8008
Step 0
FX Series Programmable Controllers