5-44 D60 Line Distance Protection System GE Multilin5.2 PRODUCT SETUP 5 SETTINGS55.2.6 MODBUS USER MAPPATH: SETTINGS PRODUCT SETUP MODBUS USER MAPThe Modbus user map provides read-only access for up to 256 registers. To obtain a memory map value, enter the desiredaddress in the ADDRESS line (converted from hex to decimal format). The corresponding value displays in the VALUE line. Avalue of “0” in subsequent register ADDRESS lines automatically returns values for the previous ADDRESS lines incrementedby “1”. An address value of “0” in the initial register means “none” and values of “0” display for all registers. DifferentADDRESS values can be entered as required in any of the register positions.5.2.7 REAL TIME CLOCKa) MAIN MENUPATH: SETTINGS PRODUCT SETUP REAL TIME CLOCKThe relay contains a real time clock (RTC) to create timestamps for communications protocols as well as for historical data,such as event records and oscillography. When the relay restarts, the RTC initializes from an onboard battery-backedclock, which has the same accuracy as an electronic watch, approximately ±1 minute per month (~23 ppm). Once the RTCis synchronized with the Precision Time Protocol (PTP), IRIG-B, or SNTP, its accuracy approaches that of the synchroniz-ing time delivered to the relay.The SYNCHRONIZING SOURCE setting configures the priority sequence that the relay uses to determine which of theavailable external time sources synchronizes the RTC and the synchrophasor clock. A setting of None causes the RTC andthe synchrophasor clock to free-run. A setting of PP/IRIGB/PTP/SNTP, IRIGB/PP/PTP/SNTP, or PP/PTP/IRIGB/SNTPcauses the relay to track the first source named that is enabled and operational, or free-run if none of these are available.Here, PP means a time source that is strictly compliant with PP, PTP means a time source that is not strictly compliant withPP. When a time source fails or recovers, the relay automatically transfers synchronization as required by this setting.See the COMMANDS SET DATE AND TIME menu item section of this manual to manually set the RTC.The REAL TIME CLOCK EVENTS setting allows changes to the date and/or time to be captured in the event record. Theevent records the RTC time before the adjustment. MODBUS USER MAPADDRESS 1: 0VALUE: 0Range: 0 to 65535 in steps of 1MESSAGE ADDRESS 2: 0VALUE: 0Range: 0 to 65535 in steps of 1MESSAGE ADDRESS 3: 0VALUE: 0Range: 0 to 65535 in steps of 1MESSAGE ADDRESS 256: 0VALUE: 0Range: 0 to 65535 in steps of 1 REAL TIME CLOCKSYNCRONIZING SOURCE:NoneRange: None, PP/IRIG-B/PTP/SNTP, IRIG-B/PP/PTP/SNTP, PP/PTP/IRIG-B/SNTPMESSAGE REAL TIME CLOCKEVENTS: DisabledRange: Disabled, EnabledMESSAGE IRIG-B SIGNAL TYPE:NoneRange: None, DC Shift, Amplitude Modulated PRECISION TIME PROTOCOL (1588) See belowEEMESSAGE SNTP PROTOCOL See belowMESSAGE LOCAL TIME See below
