Sntp Time Synchronization; Modbus Time Synchronization - ABB Remote I/O RIO600 Installation And Commissioning Manual

1MRS757488 H
6.5.1
6.5.2
RIO600
Installation and Commissioning Manual

SNTP time synchronization

RIO600 supports up to two SNTP servers (primary SNTP server and secondary SNTP
server) for time synchronization. RIO600 uses only one of the SNTP servers at a time.
The primary server is used mainly, whereas the secondary server is used (when
configured) if the primary server cannot be reached. While using the secondary SNTP
server, RIO600 tries to reach the primary server and switches back to the primary
server if it is available. If both SNTP servers are offline, the event time stamps have
a time invalid status and a warning is activated. Time synchronization requests are
sent to the SNTP server every 16 seconds. RIO600 supports the NTP/SNTP version
4.
RIO600 supports T0 class performance for time tagging of events.
If the time sync source is not configured, LECM internal reference
clock is used for RIO600 internal operation.

Modbus time synchronization

RIO600 can be synchronized by Modbus TCP client. The Modbus client should send
an unsigned 16-bit value range for setting the time value.
Modbus time synchronization can be used only if it is enabled in Parameter Setting
through the configuration and the time synchronization source is made as Modbus or
an exception code 4 is sent. The time synchronization registers can only be written
with data within the valid range of each parameter. In case the data to be written is
outside the valid range, time is not updated and an exception code 4 is sent to the
master to indicate an error in writing to time registers. If master tries to poll for the time
registers and read their data, the actual time stored in IED is reported.
The accuracy class is not guaranteed for time synchronization with Modbus
commands.
Table 114: Time synchronization with Modbus commands
Modbus address (in Information
decimal for 3X and
4X range)
8 Year
9 Month
10 Day
11 Hour
12 Minute
13 Seconds
Scale factor Data type
1 Unsigned 16
1 Unsigned 16
1 Unsigned 16
1 Unsigned 16
1 Unsigned 16
1 Unsigned 16
Section 6
Commissioning
Valid range
2000...9999
1...12
1...31
0...23
0...59
0...59
169