Omron NJ501-1500

2 Instruction Descriptions
2-606
NJ-series Instructions Reference Manual (W502)
* _sTRACE_STA[]
• Refer to the NJ-series CPU Unit Software User’s Manual (Cat. No. W501) for details on data tracing.
• This instruction can be located in more than one place in the user program. Programming can be
written to generate a trigger according to specific conditions.
• Programming can be written to generate triggers in ways that are not possible for normal trigger con-
ditions settings, such as programming to generate a trigger based on a comparison of two variables.
• Return value Out is not used when the instruction is used in ST.
• In the following cases, nothing is done and the instruction ends normally.
• Data tracing is stopped.
• The trigger condition has already been met.
• The value of TraceNo is not the trace number set from the Sysmac Studio.
• A continuous trace is specified as the trace type for the trace number that is specified with
Trac eN o.
Here, a data trace trigger is generated to store the values of variables when the current speed exceeds
the maximum speed. The TraceTrig instruction is executed when the value of Current_speed exceeds
the value of Max_speed.
Related System-defined Variables
Name Meaning Data type Description
_PLC_TraceSta[0..3] Trace Information * Trace information
Refer to the NJ-series CPU Unit Software
User's Manual (Cat. No. W501) for details.
Additional Information
Precautions for Correct Use
Sample Programming
Variable
Data type
Initial value
LD
Current_speed
Max_speed
0
20
INT
INT
Current speed
Maximum speed
GT
Current_speed
Max_speed
EN
In1
In2
USINT#1
TraceTrig
EN ENO
TraceNo
Comment
Variable
Data type
Initial value
ST
IF (Current_speed > Max_speed) THEN
TraceTrig(USINT#1);
END_IF;
Current_speed
Max_speed
0
20
INT
INT
Current speed
Maximum speed
Comment