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Trial Operation and Debugging Section 7-2
7-2-4 Tracing Data
The Data Trace function samples specified I/O memory data using any one of
the following timing methods, and it stores the sampled data in Trace Memory,
where they can be read and checked later from a Programming Device.
• Specified sampling time (10 to 2,550 ms in 10-ms units)
• One sample per cycle
• When the TRACE MEMORY SAMPLING instruction (TRSM) is executed
Up to 31 bits and 6 words in I/O memory can be specified for sampling. Trace
Memory capacity is 4,000 words.
Basic Procedure
1,2,3... 1. Sampling will start when the parameters have been set from the CX-Pro-
grammer and the command to start tracing has been executed.
2. Sampled data (after step 1 above) will be traced when the trace trigger
condition is met, and the data just after the delay (see note 1) will be stored
in Trace Memory.
3. Trace Memory data will be sampled, and the trace ended.
Note Delay value: Specifies how many sampling periods to offset the sampling in
Trace Memory from when the Trace Start Bit (A50814) turns ON. The setting
ranges are shown in the following table.
Positive delay: Store data delayed by the set delay.
Negative delay: Store previous data according go to the set delay.
Example: Sampling at 10 ms with a –30 ms delay time yields –30 x 10 = 300
ms, so data 300 ms before the trigger will be stored.
Note Use a Programming Device to turn ON the Sampling Start Bit (A50815).Never
turn ON this bit from the user program.
All OFF
Output Unit CPU Unit
Output OFF Bit: ON
No. of words
sampled
Setting range
0 –1999 to 2000
1 –1332 to 1333
2 –999 to 1000
3 –799 to 800
4 –665 to 666
5 –570 to 571
6 –499 to 500
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