GE D.20 RIO Hardware User Manual

Contents

38 GE Information D.20 RIO - HARDWARE USER’S MANUALTIME SYNCHRONIZATION STRATEGIES CHAPTER 4: SETTING UP THE D.20 RIOYou can now configure the D.20 RIO using the D.20 RIO HMI over the networkconnection. See Chapter 6, Using the D.20 RIO. You must create administrator-leveluser accounts before you can access the D.20 RIO remotely through SSH.Setting the D.20 RIO device time and dateTo set the time anddate:1. Connect to the rear maintenance RS-232 port. See “D.20 RIO field and networkconnectors” on page 29.2. At the D20RIO#>> prompt, type d20riocfg and press Enter.3. Type 5 and press Enter to select 5. Configure Time Sync.4. Type 2 and press Enter to select 2. Set System Clock.5. Complete the on screen prompts as required to set the date and time.Creating administrator-level user accountsSince you cannot use the root user account to access the D.20 RIO remotely, you mustcreate administrator-level user accounts for this purpose. This must be done for the firsttime through the D.20 RIO’s rear panel serial communications port.To create a newadministrator-leveluser account:1. Connect to the rear maintenance RS-232 port. See “D.20 RIO field and networkconnectors” on page 29.2. At the D20RIO#>> prompt, type d20riocfg and press Enter.3. Type 1 and press Enter to select 1. Configure Authentication.4. Type 5 and press Enter to select 5. Administrator Group Users.5. Complete the on screen prompts as required to create a new administrator-level user.You may now use this user account to access the D.20 RIO remotely through SSH.NOTEBy default, the D.20 RIO is configured to restrict access to various command line serviceslike SSH to administrator-level users only. You can use the Configure Administrator OnlyLogins setting under Secure Access to change this parameter and allow bothadministrator- and supervisor-level access.Time synchronization strategiesThe D.20 RIO system time needs to be updated at a high frequency from a valid timesource, to keep it accurate. It is recommended to use a D400 as the SNTP source for a D.20RIO with a fast SNTP poll frequency option (5 seconds). D.20 RIO system time accuracy isdefined as the time within the D400 and the D.20 RIO, with respect to the time input to theD400. There are two options available for time synchronization to achieve better systemtime accuracy.• IRIG-B option: A D400 is configured to accept an IRIG-B time sync input and a D.20 RIOis configured for SNTP time sync with a D400.1 ms system time accuracy can be achieved with this option. Performance test resultshave shown 1 ms accuracy recorded for 99.6% of the total D.20 RIO points.• SNTP option: A D400 is configured to accept an SNTP time sync input and a D.20 RIO isconfigured for SNTP time sync with a D400.1 ms system time accuracy cannot be assured in this option. However higher timeaccuracy can be achieved if a third-party SNTP to IRIG-B converter is used.