GE M60 Instruction Manual

Also see for M60: Communications manual Communications guide Instruction manual Instruction manual

Contents

5-82 M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUALPRODUCT SETUP CHAPTER 5: SETTINGS5The Modbus user map provides read-only access for up to 256 registers. To obtain a memory map value, enter the addressin the ADDRESS line (converted from hex to decimal format). The corresponding value displays in the VALUE line. A value of“0” in subsequent register ADDRESS lines automatically returns values for the previous ADDRESS lines incremented by “1.”An address value of “0” in the initial register means “none” and values of “0” display for all registers. Different ADDRESSvalues can be entered as required in any of the register positions.The UR Series Communications Guide outlines the Modbus memory map. The map is also viewable in a web browser; enterthe IP address of the M60 in the web browser and click the option.5.3.6 Real-time clock5.3.6.1 MenuSETTINGS  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 synchronizingtime delivered to the relay.The SYNCHRONIZING SOURCE setting configures the priority sequence of the time synchronization source, to determinewhich of the available external time sources to use for time synchronization. A setting of None causes the RTC and thesynchrophasor clock to free-run. A setting of PP/IRIG-B/PTP/SNTP, IRIG-B/PP/PTP/SNTP, or PP/PTP/IRIG-B/SNTP causes therelay to track the first source named that is enabled and operational, or free-run if none of these are available. Here, PPmeans a time source that is strictly compliant with PP, and PTP means a time source that is not strictly compliant with PP.When a time source fails or recovers, the relay automatically transfers synchronization as required by this setting.Setup for IRIG-B is illustrated in the Installation chapter.The clock is updated by all sources active in the device. This means that whenever a time synchronization message isreceived through any of the active protocols, the M60 clock updates. However, given that IEC 60870-5-103, IEC 60870-5-104, Modbus, and DNP are low-accuracy time synchronization methods, avoid their use for synchronization when betteraccuracy time protocols, such as IRIG-B, PTP, and SNTP, are active in the system.See the COMMANDS  SET DATE AND TIME menu 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. The eventrecords the RTC time before the adjustment.To enable IRIG-B synchronization, the input IRIG-B SIGNAL TYPE must be set to DC Shift or Amplitude Modulated. IRIG-Bsynchronization can be disabled by making this setting None. ADDRESS 256: 0VALUE: 0Range: 0 to 65535 in steps of 1 REAL TIME CLOCK  SYNCRONIZING SOURCE:NoneRange: None, PP/IRIG-B/PTP/SNTP, IRIG-B/PP/PTP/SNTP, PP/PTP/IRIG-B/SNTP REAL TIME CLOCKEVENTS: DisabledRange: Enabled, Disabled IRIG-B SIGNAL TYPE:NoneRange: None, DC Shift, Amplitude Modulated  PRECISION TIME PROTOCOL (1588)See below  SNTP PROTOCOLSee below  LOCAL TIMESee below