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(b) Trace Count Setting
• Total Count: The number of times that data are stored in the memory
• Count Before Trigger: The number of data storages to retain before the trigger
• Count After Trigger: A value obtained by the "Count Before Trigger" value subtracted from the "Total
Count" value.
Trace
(c) Data Acquisition Timing Setting
Set the timing for collecting trace data.
Item
Each Scan
Specified Interval
Detail Setting
*1
Pay attention to the sampling interval and sampling processing time for one sampling since the sampling trace is
performed as interrupt processing. If the sampling processing time for one sampling is long, "WDT ERROR" may occur.
(d) Trigger Condition Setting
Select the trigger point.
Item
At the Time of Trace
Instruction Execution
At the Time of Manual Trigger
Execution
Detail Setting
GX Developer allows the specification of a step No. for the data acquisition timing and the trigger condition. (The acquisition
timing and the trigger point are the timing that the state just before the execution of a specified step becomes to a specified
state.) Note however that with a step No. specified, the processing time of sampling trace is added into the program
execution time. The watchdog timer settings and the interrupt programs therefore should be designed with a consideration of
the processing time of sampling trace (setting of the fixed scan interval).
146
Count before trigger
Collects trace data during END processing of each scan.
*1
Collects trace data at specified time intervals.
Specify a device or label from the following.
• Bit device: X (DX), Y (DY), M, L, F, SM, V, B, SB, T (contact), ST (contact), C (contact), FX, FY, BL\S,
J\X, J\Y, J\SB
• Word device: T (current value), ST (current value), C (current value), D, D (extended data register), SD, W,
W (extended link register), SW, R, Z, ZR, FD, U\G, J\W, J\SW
The following modifications are available for the above devices.
• Digit specification of bit device
• Bit specification of word device
• Indirect specification of word device
• Index modification
When the set conditions are met, data collection is performed.
The time of the TRACE instruction execution is regarded as a trigger.
The time of trigger execution from the programming tool is regarded as a trigger.
Specify a device or label from the following.
• Bit device: X (DX), Y (DY), M, L, F, SM, V, B, SB, T (contact), ST (contact), C (contact), FX, FY
• Word device: T (current value), ST (current value), C (current value), D, D (extended data register), SD, W,
W (extended link register), SW, R, ZR
The following modifications are available for the above devices.
• Bit specification of word device
When the set conditions are met, this timing is set as a trigger point.
Trigger point
Count after trigger
Total count
Description
Description
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