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(4) Sampling trace operation
(a) Operation of the CPU module
When a sampling trace trigger is issued by GX Developer, the CPU module executes traces for the preset
number of times.
The number of traces will be a value of which the number of bytes for the sampling trace area divided by the
number of bytes of the specified device (N1 + N2 + N3 + word device points
*1 *2
2).
*1: Round up the result of "bit device points/16" in the expression to the right of the decimal point.
*2: Add the following values to N1 to N3 according to the items selected under the trace additional information of the trace
condition setting.
•
N1: When "Time(sec)" is selected, add "4".
•
N2: When "Step no." is selected, add "10".
•
N3: When "Program name" is selected, add "8".
CPU module
Standard RAM/memory card
*3
Specified
device data
Device
area
File
register
area
n-1
When data is stored for n th time,
the next data overwrites the 1st data.
*3: When the trigger is issued, the CPU module samples data for the preset number of times and latches the data in the
sampling trace area.
6 - 78
Sampling trace area
1st trace data
1
Read out the
2
2nd trace data
trace data to
3
3rd trace data
a peripheral.
4
4th trace data
5
5th trace data
6
6th trace data
(n-1)th trace data
n
n th trace data
Figure 6.64 Sampling trace operation
GX Developer
Sampling trace area
The specified
1
number of trace
2
data sets is
3
displayed.
4
5
6
n
1
-
n
2 + (bit device points/16)
Sampling trace
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