4.
A2CcPU
/MELSEC-A
4.2.6
Sampling
trace
tt
is not possible to check the transition of the
ON/OFF
state for bit
devices and the data
in
the
word devices with
a
peripheral device
mqnitor function.
The sampling trace function samples data from the designated
devices
at
fixed intervals and stores
the
sample data to the
samfiting trace area.
Upoir
execution of the STRA instruction, the data stored in the
sampling trace area is sampled for the designated number of
times and the device data
is
latched.
It
is possible to monitor the
data
stored in the sampling trace area
by
reading
it
with the
GPP/PHP/HGP.
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
/-
'
Aftor
tho
data
is
umpld
n
times, the next
I
dW
umpk
overwrites the
first
data
I
urn*.
I
I
I
Display
of
I
sampling trace
data
for
the
I
designated
I
trace data trace data
I
I
.A
i
1
J
1
1
After the execution
of
the
STRA
instruction, device data sampling is carried out for the designated
number
of
timer and the data in the sampling trace area
is
latched.
Fig.
4.18
Sampling
Traa
a
n
bi
'71
Y
J
1
4-28
1
IB
INAJ
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