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CHAPTER6 FUNCTIONS
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6.14 Sampling Trace Function
4) Trigger point setup
Select the trigger point from the items listed in Table6.22.
Table6.22 Trigger point setup item
Item Description
At the time of TRACE
instruction execution
The time of execution of the TRACE instruction is set as a trigger.
At the time of trigger
operation
from GX Developer
The time when a trigger is issued by GX Developer is set as a trigger.
Detail
A trace point (device and/or step number) needs to be set.
The following devices can be set as a trace point.
• 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, SD, W, SW, R, ZR
The following modification is available for the above devices.
• Bit specification of word device
Indirectly-specified devices cannot be set.
A trigger point is set as the timing of when the set conditions are met. The following shows the conditions of setting
items.
The collection timing for trace data when "Step No." is selected is the same as when setting the monitor conditions.
( Section 6.11.1)
Device Conditional formula Description
Bit device
A trigger occurs at the rising edge of the specified device/label.
A trigger occurs at the falling edge of the specified device/label.
Word device
When values match
A trigger occurs when the current value of the specified device/
label is equal to the condition value.
When writing into
devices
A trigger occurs when a value is written into the specified device/
label.
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