Modbus User Map; Real Time Clock - GE D30 Instruction Manual

PRODUCT SETUP

5.3.5 Modbus user map

SETTINGS  PRODUCT SETUP  MODBUS USER MAP
 MODBUS USER MAP

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 (if programmed) displays in the
ADDRESS
line. A value of "0" in subsequent register
incremented by 1. An address value of "0" in the initial register means "none" and values of "0" display for all registers.
Different
ADDRESS
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 D30 in a 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
5
 CLOCK
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 D30 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.
5-82
ADDRESS 1:

VALUE:
ADDRESS 256:

VALUE:
ADDRESS
values can be entered as required in any of the register positions.
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
0 Range: 0 to 65535 in steps of 1
0

0 Range: 0 to 65535 in steps of 1
0
lines automatically returns values for the previous
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
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
VALUE
lines
ADDRESS