Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 187

(b) Operation of the special relay
• When the sampling trace is executed normally
The execution status of the sampling trace can be checked in the special relays below.
Number Name
SM800 Trace preparation
SM801 Trace start
Trace execution in
SM802
progress
SM803 Trace trigger
SM804 After trace trigger
SM805 Trace completed
SM826 Trace error
The following figure shows the operation flow of the special relays 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)
.
Turns on when the trace setting in a programming tool is written to the CPU module. The
relay is used to check whether the sampling trace execution is enabled or not.
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 (off
Turns on when any of the following conditions is met. The relay is used to check the status
of trigger condition.
• A trigger is issued by a programming tool
• The TRACE instruction is executed.
• SM803 turns on.
• Detailed setting (Device and Step No.)
Turns on when the sampling trace is completed.
Turns on when an error occurs during sampling trace execution.
Trigger condition
established
Trace start requested
Total number of traces
CHAPTER 3 FUNCTIONS
Description

on).
Trace completed
Number of traces after trigger
3
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