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(b) Operation of the special relay
1) When the sampling trace is executed normally
The execution status of the sampling trace can be checked in the special relay listed in Table6.22.
Number
SM800
Trace preparation
SM801
Trace start
Trace execution in
SM802
progress
SM803
Trace trigger
SM804
After trace trigger
SM805
Trace completed
SM826
Trace error
Figure 6.65 shows the operation flow chart of the special relay for sampling trace execution.
SM80
(trace ready)
SM801
(trace start)
SM802
(Trace execution in progress)
SM803
(Trace trigger)
SM804
(After trace trigger)
SM805
(Trace completed)
Figure 6.65 Operation flow chart of the special realy (for sampling trace execution)
Table6.22 Execution status of the sampling trace
Name
Turns on when the trace setting in GX Developer is written to the CPU module.
The relay is used to check the sampling trace enable status.
Turns on when the sampling trace is started.
Turns on during sampling trace execution.
The relay is used to check the sampling trace execution status.
A trigger turns on upon the status change of the relay (offF
Turns on when any of the following condition is established.
• A trigger is issued by GX Developer.
• The TRACE instruction is executed.
• SM803 turns on.
• Detailed setting (Device and Step No.)
The relay is used to check the trigger condition establishment status.
Turns on when the sampling trace is completed.
Turns on when an error occurs during sampling trace execution.
Trace start requested
Total number of traces
Description
Trigger condition
established
Trace completed
Number of traces after trigger
CHAPTER6 FUNCTIONS
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