Sampling Trace Function - Mitsubishi Electric Q01UCPU User Manual

3.14

Sampling Trace Function

This function samples the data of the specified device at a preset timing and at a preset interval (sampling cycle), and
then stores the trace results in the sampling trace
(1) Application
The change in the device data used in the program during debugging can be checked at a specified timing. Also,
this function is used to read the device data at trigger condition establishment.
(2) Sampling trace file
This file stores the trace setting necessary for executing the function and trace results. A sampling trace file is
stored in the following memory.
Q00UCPU, Q01UCPU, QnUDVCPU
Q02UCPU, QnUD(H)CPU, QnUDE(H)CPU
(3) Sampling trace operation
(a) Operation of the CPU module
When a sampling trace trigger is issued by a programming tool, 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 × 2 + (bit device
points/16) × 2).
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.
*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".
*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.
Note 3.9
Universal
The Q00UJCPU does not support this function.
182
CPU module
*1 *2
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
Note 3.9
file.Note 3.9
Programming tool
Sampling trace area
1
2
3
4
5
6
n 1
-
n
Memory
Standard RAM
Standard RAM or SRAM card
The specified
number of trace
data sets is
Monitoring
displayed.
sampling trace
data