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Appendix A

A-82

NJ/NX-series Database Connection CPU Units User’s Manual (W527)

Structured Text (ST)

 Main Variables

Name

Data type

Initial value

Comment

DB_PutLog_instance

DB_PutLog

---

Instance of DB_PutLog instruction

Trigger

BOOL

FALSE

Variable used as a trigger for recording the user-specified log

LastTrigger

BOOL

FALSE

Variable to retain the trigger status of the previous execution

Operating BOOL FALSE When this variable is TRUE, recording of the user-specified log is

executed.

OperatingStart

BOOL

FALSE

The initialization processing is executed when this variable is TRUE.

RecipeCode

UDINT

1234678

Recipe code used in the log message.

Msg

STRING[256]

‘’

Log message to record

 Sample Programming

(* -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

- Record the log code 100, log name Production Order, and log message Production Start, RecipeCode=12345678 into the Execution Log.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- *)

// Start the sequence when the variable Trigger changes to TRUE.

IF ( (Trigger=TRUE) AND (LastTrigger=FALSE) ) THEN

OperatingStart := TRUE;

Operating := TRUE;

END_IF;

LastTrigger := Trigger;

// Sequence start processing

IF (OperatingStart=TRUE) THEN

// Initialize the instruction instance.

DB_PutLog_instance( Execute:=FALSE );

// Create the log message.

Msg := CONCAT('Production Start,RecipeCode=',UDINT_TO_STRING(RecipeCode));