Mitsubishi 00JCPU User Manual page 255

(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 sampling trace area can store data up to 60K bytes.
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
Sampling trace area
Specified
device data
1
Device
2 2nd trace data
area
3
File 4
register
5
area
6
n-1
(n-1)th trace data
n
n th trace data
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.
1st trace data
Read out the
trace data to
3rd trace data
a peripheral.
4th trace data
5th trace data
6th trace data
Figure 6.56 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
CHAPTER6 FUNCTIONS
2 + (bit device points/16)
Sampling trace
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