Help
  • Explore Community
  • Get Started
  • Ask the Community
  • How-To & Best Practices
  • Contact Support
Notifications
Login / Register
Community
Community
Notifications
close
  • Forums
  • Knowledge Center
  • Events & Webinars
  • Ideas
  • Blogs
Help
Help
  • Explore Community
  • Get Started
  • Ask the Community
  • How-To & Best Practices
  • Contact Support
Login / Register
Sustainability
Sustainability

Join our "Ask Me About" community webinar on May 20th at 9 AM CET and 5 PM CET to explore cybersecurity and monitoring for Data Center and edge IT. Learn about market trends, cutting-edge technologies, and best practices from industry experts.
Register and secure your Critical IT infrastructure

What is the accuracy of Real Time Clock?

Building Automation Knowledge Base

Schneider Electric Building Automation Knowledge Base is a self-service resource to answer all your questions about EcoStruxure Building suite, Andover Continuum, Satchwell, TAC…

cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Show  only  | Search instead for 
Did you mean: 
  • Home
  • Schneider Electric Community
  • Knowledge Center
  • Building Automation Knowledge Base
  • What is the accuracy of Real Time Clock?
Options
  • Bookmark
  • Subscribe
  • Email to a Friend
  • Printer Friendly Page
  • Report Inappropriate Content
Invite a Co-worker
Send a co-worker an invite to the portal.Just enter their email address and we'll connect them to register. After joining, they will belong to the same company.
You have entered an invalid email address. Please re-enter the email address.
This co-worker has already been invited to the Exchange portal. Please invite another co-worker.
Please enter email address
Send Invite Cancel
Invitation Sent
Your invitation was sent.Thanks for sharing Exchange with your co-worker.
Send New Invite Close

Related Forums

  • Intelligent Devices Forum

Previous Next
Contributors
  • Cody_Failinger
    Cody_Failinger
  • DavidFisher
    DavidFisher
  • CraigEl
    CraigEl
  • sesa139513
    sesa139513
  • Product_Support
    Product_Support

Invite a Colleague

Found this content useful? Share it with a Colleague!

Invite a Colleague Invite
Back to Building Automation Knowledge Base
Options
  • Bookmark
  • Subscribe
  • Email to a Friend
  • Printer Friendly Page
  • Report Inappropriate Content
0 Likes
1775 Views

Link copied. Please paste this link to share this article on your social media post.

Trying to translate this page to your language?
Select your language from the translate dropdown in the upper right. arrow
Translate to: English
  • (Français) French
  • (Deutsche) German
  • (Italiano) Italian
  • (Português) Portuguese
  • (Русский) Russian
  • (Español) Spanish

What is the accuracy of Real Time Clock?

Picard Product_Support
‎2018-09-11 04:50 AM

Last Updated: Administrator CraigEl Administrator ‎2022-08-10 02:18 AM

Issue

What is the accuracy of RTC?

Product Line

Andover Continuum

Environment

Site with controllers using the RTC Crystal Quartz chip (controllers such as the ACX)

Cause

What is the accuracy of Real Time Clock? 

Resolution

When the controller is powered down, the battery-backed RTC Chip has an accuracy of +/- 1 minute per month. When powered on, the controllers use the RTC chip as a reference point but keep time in software. Experience has shown an accuracy of 1 – 2 seconds per month when controllers are offline and not re-synched from the Network. Since that is typical and not calculated, a conservative number would be +/- 10 seconds per month. When Online,the accuracy is determined by Cyberstation which can itself be synched to an extremely accurate NST Server. I2 and B3 controllers are re-synched once per hour.


For Sync time in Cyberstation(s) and Server check Sync time in Cyberstation and Server.
For more information see What are the differences between a hardware and a software Real Time Clocks (RTC)?.
For how field controllers keep their own internal time check How do our field controllers keep their own internal time?

Labels (1)
Labels:
  • Andover Continuum
Tags (1)
  • Find more articles tagged with:
  • 13544
Was this article helpful? Yes No
No ratings

Link copied. Please paste this link to share this article on your social media post.

To The Top!

Forums

  • APC UPS Data Center Backup Solutions
  • EcoStruxure IT
  • EcoStruxure Geo SCADA Expert
  • Metering & Power Quality
  • Schneider Electric Wiser

Knowledge Center

Events & webinars

Ideas

Blogs

Get Started

  • Ask the Community
  • Community Guidelines
  • Community User Guide
  • How-To & Best Practice
  • Experts Leaderboard
  • Contact Support
Brand-Logo
Subscribing is a smart move!
You can subscribe to this board after you log in or create your free account.
Forum-Icon

Create your free account or log in to subscribe to the board - and gain access to more than 10,000+ support articles along with insights from experts and peers.

Register today for FREE

Register Now

Already have an account? Login

Terms & Conditions Privacy Notice Change your Cookie Settings © 2025 Schneider Electric

This is a heading

With achievable small steps, users progress and continually feel satisfaction in task accomplishment.

Usetiful Onboarding Checklist remembers the progress of every user, allowing them to take bite-sized journeys and continue where they left.

of