Mitsubishi Q00JCPU User Manual page 331

6
FUNCTIONS
(5) Precautions
(a) Requirements to execute sampling trace
(b) Areas where sampling trace can be executed
(c) Holding and clearing of trace information
(d) Connection with CPU module when sampling trace is executed
(e) Read in STOP status
(f) Trigger condition at sampling trace execution
SRAM card is required for sampling trace.
Set the sampling trace file in the memory card (SRAM).
The sampling trace can be executed from other station on the network or serial
communication module. However, the trace cannot be executed from multiple
areas at once. The trace can only be executed from one area with CPU module.
The trace information (trace file) registered in the High Performance model QCPU
is registered in the SRAM card and latched. As the condition data is stored in the
trace file, even if the power is off or the CPU module is reset, the sampling trace
can be executed under registered trace conditions.
In either of the following cases, however, the latched trace information is cleared
when the PLC is powered ON (OFF and then ON) or when the CPU module is
reset. Therefore, reregister the trace information from GX Developer.
• The SRAM card registered in a trace file is not inserted
• The trace file is corrupted
This requires registering trace information once again by operating from GX
Developer.
To clear data, perform the latch-clear operation with the RESET/L.CLR switch.
To perform sampling trace again after latch clear, execute sampling trace after
selecting "Regist trace".
Execute sampling trace after connecting GX Developer to the CPU module.
While in STOP status, the CPU module cannot read sampling trace results. To
enable the CPU module to read the sampling trace results, enter the CPU module
into RUN status.
When executing the sampling trace, ensure that trigger conditions cannot be
satisfied at trigger points. If the trigger conditions are met when executing the
sampling trace, they will not be recognized as trigger conditions.
6.14 Sampling Trace Function
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