# Subscription Rate vs Revised Rate 7.9.12

**URL:** <https://forum.inductiveautomation.com/t/subscription-rate-vs-revised-rate-7-9-12/30828>\
**Category:** Ignition\
**Created:** [December 19, 2019, 3:43pm UTC](https://forum.inductiveautomation.com/t/subscription-rate-vs-revised-rate-7-9-12/30828 "2019-12-19T15:43:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sbrannen](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/sbrannen/32/3459_2.png) [@sbrannen](https://forum.inductiveautomation.com/u/sbrannen)\
**Post date:** [December 19, 2019, 3:43pm UTC](https://forum.inductiveautomation.com/t/subscription-rate-vs-revised-rate-7-9-12/30828/1 "2019-12-19T15:43:18Z")

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Two questions:  
**1) What sets the _Subscription Rate_ speed in this context?** I noticed in the help manual that the Subscription Rate is 1000ms in the example given, so just wondering why or how mine is set to 250ms. Is it all device driver based?  
**2) What is the _Revised Rate_?** I am assuming the Scan Class rate.

Note: All 227,000 tags in the project show a Subscription Rate of 250ms but we have about 15 different scan classes… (Using the default RSLogix 21+ driver and Ignition’s OPC-UA)

 ![Sunscription%20Rate](https://us1.discourse-cdn.com/inductiveautomation/original/2X/9/9b34108dd212ce2f7d877d9ab631f1d113bdc549.png)

As you were…  
Steve