Historian Scan class or other

Ignition
1

I have set my slow point to 900,000ms and my stale is double that time. I was hoping that this would only check and store to the DB every 15 minutes. What I am seeing is that there are still records being stored every second for the tag this historian is monitoring.

How do I only scan/store PLC data every 15 minutes.

Please help.

Version
License
Ignition Platform
7.4.2 (b953)

SQL Bridge Module
5.4.1 (b160)
Activated
Vision Module
6.4.1 (b505)
Activated
Mobile Module
1.4.0 (b111)
Trial
ActiveX Module
2.4.0 (b93)
Free
Symbol Factory Module
2.6.0 (b35)
Activated
Reporting Module
1.4.0 (b102)
Activated
Connected Gateway: : http://Edit:8088/main
Java Version: Sun Microsystems Inc. 1.6.0_29
JVM Memory (used/max MB): 70.6 / 494.9
Client Time Zone: America/New_York [GMT-5:00]
Gateway Time Zone: America/New_York [GMT-5:00]

2

It sounds like you should have it about right. You’re using a direct scan class, right?

  1. Create/set scan class, mode=direct, slow rate=900000 (stale time doesn’t matter much for internal tags)
  2. Set the tag’s historical scan class to be that SC. The normal scan class can be something faster.
  3. Go to Status>SQLTags in the gateway and look at the scan class. You should see its rate reported at “15 min”, and you should see the tag in the Historical Tag count.

Side note: In your system stats, I see you’re running Java update 29. This version had a big problem that affected JDBC connections. You should upgrade to u31 (they skipped 30) when you get a chance. Doesn’t have anything to do with what we’re talking about, but wanted to point it out.

Regards,