Modbus User Map; Real Time Clock - GE L90 Instruction Manual
Ur series line current differential system
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Also See for L90:
- Instruction manual (900 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (470 pages)
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5.2 PRODUCT SETUP
PATH: SETTINGS
PRODUCT SETUP
MODBUS USER MAP
The Modbus user map provides read-only access for up to 256 registers. To obtain a memory map value, enter the desired
address in the
ADDRESS
value of "0" in subsequent register
by "1". 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.
ADDRESS
a) MAIN MENU
5
PATH: SETTINGS
PRODUCT SETUP
REAL TIME
CLOCK
EE
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 synchroniz-
ing time delivered to the relay. When the L30/L90 channel asymmetry function is used, the relay's real time clock must be
synchronized to an external time source using PTP or IRIG-B, typically from a global positioning system (GPS) receiver.
The SYNCHRONIZING SOURCE setting configures the priority sequence that the relay uses to determine which of the
available external time sources synchronizes the RTC and the synchrophasor clock. A setting of None causes the RTC and
the synchrophasor clock to free-run. A setting of PP/IRIGB/PTP/SNTP, IRIGB/PP/PTP/SNTP, or PP/PTP/IRIGB/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, 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.
See the
COMMANDS
5-44
MODBUS USER MAP
ADDRESS
VALUE:
ADDRESS
MESSAGE
VALUE:
ADDRESS
MESSAGE
VALUE:
ADDRESS 256:
MESSAGE
VALUE:
line (converted from hex to decimal format). The corresponding value displays in the
lines automatically returns values for the previous
ADDRESS
REAL TIME CLOCK
SYNCRONIZING SOURCE:
None
REAL TIME CLOCK
MESSAGE
EVENTS: Disabled
IRIG-B SIGNAL TYPE:
MESSAGE
None
PRECISION TIME
PROTOCOL (1588)
SNTP PROTOCOL
MESSAGE
LOCAL TIME
MESSAGE
menu item section of this manual to manually set the RTC.
SET DATE AND TIME
L90 Line Current Differential System
Range: 0 to 65535 in steps of 1
1:
0
0
Range: 0 to 65535 in steps of 1
2:
0
0
Range: 0 to 65535 in steps of 1
3:
0
0
Range: 0 to 65535 in steps of 1
0
0
Range: None, PP/IRIG-B/PTP/SNTP, IRIG-B/PP/PTP/
SNTP, PP/PTP/IRIG-B/SNTP
Range: Disabled, Enabled
Range: None, DC Shift, Amplitude Modulated
See below
See below
See below
5 SETTINGS
5.2.6 MODBUS USER MAP
line. A
VALUE
lines incremented
ADDRESS
5.2.7 REAL TIME CLOCK
GE Multilin
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