5-10 F650 DIGITAL BAY CONTROLLER GEK-106310-AF
5.2 PRODUCT SETUP CHAPTER 5: SETPOINTS
5.2.1.6 SNTP
The F650 supports the Simple Network Time Protocol specified in RFC-2030. With SNTP, the F650 can obtain the clock time
over an Ethernet network. The F650 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. Three different modes of SNTP operation are
supported. These modes are unicast, broadcast and anycast.
If SNTP functionality is enabled at the same time as an IRIG-B source is connected to the F650, the IRIG-B signal provides
the time value to the F650 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.
To use SNTP in unicast mode, Server IP Oct1...4 must be set to the SNTP/NTP server IP address. Once this address is set
and the Function setting is “UNICAST”, the F650 attempts to obtain time values from the SNTP/NTP server. Since many
time values are obtained and averaged, it generally takes forty seconds until the F650 clock is synchronized with the
SNTP/NTP server. It may take up to one minute for the F650 to signal an SNTP FAIL state if the server is offline.
To use SNTP in broadcast mode, set the Function setting to “BROADCAST”. The F650 then listens to SNTP messages sent to
the “all ones” broadcast address for the subnet. The F650 waits up to eighteen minutes (>1024 seconds) without receiving
an SNTP broadcast message before signalling an SNTP FAIL state.
To use SNTP in anycast mode, set the Function setting to “ANYCAST”. Anycast mode is designed for use with a set of
cooperating servers whose addresses are not known beforehand by the client. The F650 sends a request to a multicast
group address assigned by IANA for NTP protocol. This address is 224.0.1.1 and a group of SNTP/NTP servers listens to it.
Upon receiving a request each server sends a unicast response to the SNTP/NTP client. The F650 relay binds to the first
unicast message received from any server. Then it continues operating with SNTP/NTP server in unicast mode. Any further
responses from other SNTP/NTP servers are ignored. In unicast mode of operation the chosen time server can go offline, in
that case it takes about one minute for the F650 to signal an SNTP FAIL state and to switch again to anycast mode to try to
find another time server. In anycast mode the F650 tries to send multicast messages up to five minutes before signalling
an SNTP FAIL state.
The F650 relay does not support the multicast mode of SNTP functionality.
For firmware version 7.20 or above, F650 shall accept time synchronization from up to two different SNTP servers. In order
to define number of SNTP servers to be used, different settings for each SNTP server must be configured in the F650.
SNTP1 or/and SNTP2 tab settings shall be configured.
If only one SNTP server is used to synchronize the relay, SNTP1 tab settings shall be filled with its corresponding settings. If
two SNTP servers are used, SNTP1 and SNTP2 tab shall be filled as follow:
IEC104 DEADBAND POWER 30000 [0 : 65535]
IEC104 DEADBAND ENERGY 30000 [0 : 65535]
IEC104 DEADBAND OTHER 30000 [0 : 65535]
IEC104 IOA BINARIES 1000 [0 : 65535]
IEC104 IOA DOUBLE POINTS 1500 [0 : 65535]
IEC104 IOA ANALOGS 2000 [0 : 65535]
IEC104 IOA COUNTERS 4000 [0 : 65535]
IEC104 IOA COMMANDS 3000 [0 : 65535]
IEC104 IOA ANALOG PARAMETERS 5000 [0 : 65535]
Product Setup > Communication settings >SNTP> SNTP1/SNTP2
Name Default Value Step Range
Function DISABLED N/A [DISABLED – ENABLED]
UDP Port 123 1 [1 : 65535]
Server Ip Oct1 0 1 [0 : 255]
Server Ip Oct2 0 1 [0 : 255]
Server Ip Oct3 0 1 [0 : 255]
Server Ip Oct4 0 1 [0 : 255]
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