INSERT Query binding to a Tag value and it should insert for every 1 minute

[Shaheryar_Ahmad]

Hi Everyone.

I have a machine of which getting its ‘start process’ boolean status over OPCUA. From that tag, I can see when the machine is running or not.
From that tag status, I want to INSERT some machine related data into MySQL table.

Condition: (When the machine is running, the machine’s ‘start process’ tag value changes to 1 and than the INSERT query has to run for inserting machine data into database for every 1 minute interval. When the machine stopped running, the Insert query has to stop. Same process start, when again machine starts running)

Please guide how can I do this

• I am able to execute INSERT query on a ‘button’ pressed event. But, here I want to do this on a tag value.
  

• Already prepared a named query for INSERT operation.
  

  

[PGriffith]

The easiest way would be a transaction group.

The next best way would probably be a gateway timer script (running on a 1 minute interval) that first checks your ‘trigger tag’, and then conditionally runs your named query.

[josborn]

What @PGriffith said. But if you require the data be recorded exactly when the tag changed to true and exactly 1 minute intervals starting from that point and want to do your inserts with a named query, you may want to consider incrementing an integer every minute while the machine is running and using a tag change script to run your query.

[Transistor]

Here’s how to do the tag change.

In the Script tab you would check that the tag is true before executing your query.

If you want your 1 minute time to start counting from the batch start (rather than the system clock rolling over to :00 seconds, etc.) then you could create a memory tag.

Put this code into the expression:

// Start counting minutes when the batch starts.
// Return a zero if the batch has stopped.
if(
	{[~]Start_Process_Latch},
	round((now() - {[~]Start_Process_Latch.Timestamp}) / 1000 / 60, 0),
	0
)

(You need to browse for your Start_Process_Latch tag so that you get the full path.)

Change the / 60 to something like 3 s to speed up debugging.

[Shaheryar_Ahmad]

@PGriffith Thankyou so much for the guide. I have used the transaction group technique for inserting values to database on tag change.And, I find it quite efficient, what you say? as I have to implement it for a long duartion.

• Extremely sorry, I completely forgot to reply on this post.