1756-TIME GPS Rollover Awareness Posted on May 1, 2019 by Brandy McNeil 1756-Time GPS Rollover Awareness Product Safety Group 1201 South Second Street Milwaukee, WI USA 53204 productsafety@ra.rockwell.com expanding human possibility™ PRODUCT NOTICE Notice of Potential Product Concern Rockwell Automation issues a Product Notice when it identifies a product(s) anomaly that may cause commercial or customer satisfaction concerns. 1756-TIME GPS Rollover Event Awareness Reference: 2019-05-001 Date: May 2019 This Product Notice provides awareness of Global Positioning System (GPS) events that may affect time keeping capabilities of the 1756HP-TIME and 1756-TIME ControlLogix® GPS Time Synchronization modules. The GPS uses fixed size counters to manage various aspects of time keeping. When a counter rolls over (maximum value to zero) time keeping devices dependent on that counter may need to be updated to compensate. PRODUCT NOTICE Page 2 of 5 expanding human possibility™ – Product Identification – The potentially affected products are 1756-TIME and 1756HP-TIME GPS Time Synchronization Modules. 1756HP-TIME 1756-TIME Series A 1756-TIME Series B On installed product, the product identification information may be found on the product nameplate, located on the side of the product module. The catalog number will be on the left side in the CAT field and the as shipped version information in the F/W REV field. Since the firmware version may have been updated in the field after receipt, you should verify the firmware revision using online tools such as Studio 5000 Logix Designer® or FactoryTalk® Network Manager. In the example shown below, the catalog number is 1756-TIME Series B and the firmware revision is 3.005. Firmware version 3.005 contains the correction for the week counter rollover event and is the correct version as of the release of this notification. On product still within its shipping carton, the product identification information may be found on the carton label. The catalog number will be on the left side in the CAT field and the as shipped version information in the FW field. In the example shown to the right, the catalog number is 1756-TIME Series B and the firmware revision is 3.005. Firmware version 3.005 contains the correction for the week counter rollover event and is the correct version as of the release of this notification. PRODUCT NOTICE Page 3 of 5 expanding human possibility™ – Description – Future Global Positioning System (GPS) events may affect the time keeping capabilities of the 1756HP-TIME and 1756-TIME ControlLogix® GPS Time Synchronization modules. The GPS uses fixed size counters to manage various aspects of time keeping. When a counter rolls over (maximum value to zero) time keeping devices dependent on that counter may need to be updated to compensate. A recent rollover event occurred 0n April 6, 2019. The GPS time standard rolled over the week counter to zero. In the GPS, weeks are calculated using a 10-bit counter, giving a maximum of 1024 weeks prior to rolling over to week 0. This correlates to approximately 19.7 years. When the rollover occurred, GPS devices that used this information to calculate time erroneously calculated the week as 0, or 19.7 years in the past. The next week rollover event for devices using this 10-bit counter is expected to occur on September 27, 2036. As reported by the US Naval Observatory (USNO), “there is an ongoing multi-billion-dollar program of upgrades to improve the overall performance of the Global Position System. Included within this program is a move towards a 13-bit date field to represent the week number. Thirteen binary bits represents around 157 years per epoch. Newer GPS receivers will not be affected by the current end-of-epoch situation”. Additional information concerning the recent 10-bit week counter rollover event may be found at the Department of Homeland Security and the US Naval Observatory. Additional future events may have a similar effect on the 1756-TIME module. Rockwell Automation has created Knowledgebase Article ID 1082057 to address this and future events that may affect the 1756-TIME module. – Temporary Workarounds – No workaround has been identified for older 1756HP-TIME and 1756-TIME Series A modules. Rockwell Automation encourages customers with older modules to migrate to the current 1756-TIME Series B modules. – Correction – Rockwell Automation will update Knowledgebase Article ID 1082057 when upcoming rollover events result in firmware revisions. Customers are encouraged to subscribe to updates to this article to receive advance notification. Users of prior 1756HP-TIME and 1756-TIME Series A modules must migrate to the current 1756-TIME Series B module prior to 2021. Migration of older product is at the discretion and cost of the customer. Users of current 1756-TIME Series B modules should upgrade their module to firmware version 3.005 or later. Updated firmware can be field installed and is available on the Rockwell Automation Product Compatibility and Download Center (PCDC). Access the PCDC at https://compatibility.rockwellautomation.com/Pages/home.aspx. Click the “Find Downloads” link and enter 1756-TIME. Make sure to select the latest firmware release for the Series B module. Follow the instructions to complete the firmware download. PRODUCT NOTICE Page 4 of 5 expanding human possibility™ – Requested Customer Action – Rockwell Automation requests you take the following actions: Check if you have a product affected by this Product Notice. Refer to the Product Identification and Description sections of this document for product identification assistance. Follow the steps in the Correction section of this document to make sure you have the latest firmware revision for your 1756-TIME Series B module. Prior to installation of new product, verify the firmware level to make sure you have the latest firmware revision. If you need additional assistance, please contact Rockwell Automation Technical Support. See Appendix A for local telephone numbers. Customers without TechConnect℠ support contracts should reference this Product Notice when calling. Customers with TechConnect support contracts may be able to chat online with support representatives. Reference this Product Notice when connected to a support engineer. The most current version of this Product Notice is posted on the Rockwell Automation Support Center, http://www.rockwellautomation.com/knowledgebase, as ID number 1087251. Additional languages may also be available at the end of this article attached as downloadable PDF documents. If this Product Notice does not affect you because you do not have the products any longer, or if you are a Distributor, Rockwell Automation asks that you forward a copy of this notice, with any identifying documentation, immediately to the person or company that now has the product. We also ask that you contact Rockwell Automation Technical Support and provide the location of the affected units. We appreciate your immediate cooperation. If you have any questions, please contact us. Sincerely, ROCKWELL AUTOMATION You can register for Automatic Product Safety Advisories and Product Notices from Rockwell Automation by email. Go to the Support web page at http://www.rockwellautomation.com/support and click the Search Knowledgebase – Get Answers link. Sign in with your TechConnect Account or free Rockwell Automation Member Account and you can subscribe to important product updates, including Product Safety Advisories and Product Notices. Trademarks not belonging to Rockwell Automation are property of their respective companies. PRODUCT NOTICE Page 5 of 5 expanding human possibility™ Appendix A Regional Technical Support Information The following list can help you to contact the correct technical support center for your location. If your country is not listed, you can find a customer support number for your location by going to the Rockwell Automation Knowledgebase as https://rockwellautomation.custhelp.com. Mouse over Support and select Find Local Support, then enter your location information. If you have a TechConnect℠ support contract, please use the telephone number supplied to you with the contract. Region / Country Phone Number ( ) International Code Region / Country Phone Number ( ) International Code Asia/Pacific Europe Australia 1 800 762 593 Austria (49) 211 41553 664 China 400 620 6620 Belgium (32) 2 716 8411 Hong Kong +852 2887 4666 Czech Republic (420) 28401 5911 India 1 800 2000 121 Denmark (45) 43 466 006 Japan 03 3206 2785 Finland (358) 958 447 419 Korea (82) 2 2188 4400 France (33) 825303132 Malaysia 1 800 80 4851 Germany (49) 211 41553 664 New Zealand 0800 27 27 25 Hungary (420) 28401 5911 Taiwan 080 902 0908 Ireland (44) 01908 635245 Thailand (66) 2936 1500 Italy (Brescia, Milano e Padova) (39) 199 11 99 00 Caribbean Italy (Bologna,Firenze,Napoli, Roma e Torino) (39) 199 11 99 22 All Countries (English) (1) 440 646 3223 Morocco (33) 825303132 All Countries (Español) (1) 440 646 3650 Netherlands (31) 10 266 55 80 Central America Poland (48) 22 32 60 707 Argentina 800.666.0320 Portugal (1) 440 646 3223 Belize (1) 440 646 3650 Slovakia (420) 284015911 Bolivia (54) 800 10 0632 Spain (34) 902 30 93 30 Brazil (55) 11 5189 9500 Sweden (46) 46 19 93 91 Chile 800.53.0012 Switzerland (German) (41) 0844 84 84 11 Colombia 01.800.700.2107 Switzerland (French) (41) 0844 84 84 12 Costa Rica 0800.013.1215 Switzerland (Italian) (41) 0844 84 84 13 Ecuador 58.212.949.0611 United Kingdom (44) 01908 635245 El Salvador (52) 55 5246 2010 North America Guatemala 1.800.288.0108 Canada (1) 440-646-3223 Honduras (52) 55 5246 2010 United States (1) 440-646-3223 Mexico 001.888.365.8677 Nicaragua (52) 55 5246 2010 Panama 001.800.203.3475 Paraguay (54) 11 5554 4000 Peru 0800.535.36 Suriname (1) 440 646 3650 Uruguay (54) 11 5554 4000 Venezuela 800.1.00.3062