Real-Time Clock - GE C30 Instruction Manual

PRODUCT SETUP
The Modbus user map provides read-only access for up to 256 registers. To obtain a memory map value, enter the address
in the line (converted from hex to decimal format). The corresponding value displays in the
ADDRESS
"0" in subsequent register
An address value of "0" in the initial register means "none" and values of "0" display for all registers. Different
values 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; enter
the IP address of the C30 in the web browser and click the option.

5.3.6 Real-time clock

5.3.6.1 Menu
SETTINGS  PRODUCT SETUP  REAL TIME CLOCK
 REAL TIME
 CLOCK
5
The 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-backed
clock, which has the same accuracy as an electronic watch, approximately ±1 minute per month (~23 ppm). Once the RTC
is synchronized with the Precision Time Protocol (PTP), IRIG-B, or SNTP, its accuracy approaches that of the synchronizing
time delivered to the relay.
The
SYNCHRONIZING SOURCE
which of the available external time sources to use for time synchronization. A setting of None causes the RTC and the
synchrophasor clock to free-run. A setting of PP/IRIG-B/PTP/SNTP, IRIG-B/PP/PTP/SNTP, or PP/PTP/IRIG-B/SNTP causes 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, 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 is
received through any of the active protocols, the C30 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 better
accuracy time protocols, such as IRIG-B, PTP, and SNTP, are active in the system.
See the
COMMANDS  SET DATE AND TIME
The
REAL TIME CLOCK EVENTS
records the RTC time before the adjustment.
To enable IRIG-B synchronization, the input
synchronization can be disabled by making this setting None.
5-78
ADDRESS 256:

VALUE: 0
lines automatically returns values for the previous
ADDRESS
SYNCRONIZING SOURCE:

None
REAL TIME CLOCK

EVENTS: Disabled
IRIG-B SIGNAL TYPE:

None
 PRECISION TIME

 PROTOCOL (1588)
 SNTP PROTOCOL


 LOCAL TIME


setting configures the priority sequence of the time synchronization source, to determine
menu section of this manual to manually set the RTC.
setting allows changes to the date and/or time to be captured in the event record. The event
IRIG-B SIGNAL TYPE
0 Range: 0 to 65535 in steps of 1
ADDRESS
Range: None, PP/IRIG-B/PTP/SNTP, IRIG-B/PP/PTP/
SNTP, PP/PTP/IRIG-B/SNTP
Range: Enabled, Disabled
Range: None, DC Shift, Amplitude Modulated
See below
See below
See below
must be set to DC Shift or Amplitude Modulated. IRIG-B
C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
line. A value of
VALUE
lines incremented by "1."
ADDRESS