Modbus User Map; Real Time Clock - GE t60 Instruction Manual

5.2 PRODUCT SETUP
j) SNTP PROTOCOL
PATH: SETTINGS PRODUCT SETUP
SNTP PROTOCOL
The T60 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the T60 can obtain clock time over
an Ethernet network. The T60 acts as an SNTP client to receive time values from an SNTP/NTP server, usually a dedicated
product using a GPS receiver to provide an accurate time. Both unicast and broadcast SNTP are supported.
If SNTP functionality is enabled at the same time as IRIG-B, the IRIG-B signal provides the time value to the T60 clock for
as long as a valid signal is present. If the IRIG-B signal is removed, the time obtained from the SNTP server is used. If
either SNTP or IRIG-B is enabled, the T60 clock value cannot be changed using the front panel keypad.
To use SNTP in unicast mode,
set and
SNTP FUNCTION
values are obtained and averaged, it generally takes three to four minutes until the T60 clock is closely synchronized with
the SNTP/NTP server. It may take up to one minute for the T60 to signal an SNTP self-test error if the server is offline.
To use SNTP in broadcast mode, set the
T60 then listens to SNTP messages sent to the "all ones" broadcast address for the subnet. The T60 waits up to eighteen
minutes (>1024 seconds) without receiving an SNTP broadcast message before signaling an SNTP self-test error.
5
The UR does not support the multicast or anycast SNTP functionality.
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
played in the line. A value of "0" in subsequent register
VALUE
lines incremented by "1". An address value of "0" in the initial register means "none" and values of "0" will be dis-
ADDRESS
played for all registers. Different
These settings can also be used with the DNP protocol. See the DNP Analog Input Points section in Appen-
dix E for details.
NOTE
PATH: SETTINGS PRODUCT SETUP
REAL TIME
CLOCK
The date and time for the relay clock can be synchronized to other relays using an IRIG-B signal. It has the same accuracy
as an electronic watch, approximately ±1 minute per month. An IRIG-B signal may be connected to the relay to synchronize
the clock to a known time base and to other relays. If an IRIG-B signal is used, only the current year needs to be entered.
See also the
COMMANDS
5-16
COMMUNICATIONS
SNTP FUNCTION:
Disabled
SNTP SERVER IP ADDR:
MESSAGE
0.0.0.0
SNTP UDP PORT
MESSAGE
NUMBER: 123
SNTP SERVER IP ADDR
is "Enabled", the T60 attempts to obtain time values from the SNTP/NTP server. Since many time
SNTP SERVER IP ADDR
MODBUS USER MAP
ADDRESS
VALUE:
ADDRESS 256:
MESSAGE
VALUE:
line (this value must be converted from hex to decimal format). The corresponding value is dis-
values can be entered as required in any of the register positions.
ADDRESS

REAL TIME CLOCK

IRIG-B SIGNAL TYPE:
None
menu for manually setting the relay clock.
SET DATE AND TIME
T60 Transformer Management Relay
SNTP PROTOCOL
Range: Enabled, Disabled
Range: Standard IP address format
Range: 0 to 65535 in steps of 1
must be set to the SNTP/NTP server IP address. Once this address is
setting to "0.0.0.0" and
Range: 0 to 65535 in steps of 1
1: 0
0
↓
Range: 0 to 65535 in steps of 1
0
0
lines automatically returns values for the previous
ADDRESS
Range: None, DC Shift, Amplitude Modulated
5 SETTINGS
to "Enabled". The
SNTP FUNCTION
5.2.5 MODBUS USER MAP
5.2.6 REAL TIME CLOCK
GE Multilin