Clock Function - Toshiba GRL150-100 Series Instruction Manual

4.5 IEC 60870-5-103 Interface
The GRL150 can support the IEC60870-5-103 communication protocol. This protocol is mainly
used when the relay communicates with a control system and is used to transfer the following
measurand, status data and general command from the relay to the control system.
• Measurand data: current
• Status data:
The IEC60870-5-103 function in the relay can be customized with the original software "IEC103
configurator". It runs on a personal computer (PC) connected to the relay, and can help setting of
Time-tagged messages, General command, Metering, etc. For details of the setting method, refer
to "IEC103 configurator" manual. For the default setting of IEC60870-5-103, see Appendix M.
The protocol can be used through the RS485 port on the relay rear panel and can be also used
through the optional fibre optical interface.
The relay supports two baud-rates 9.6kbps and 19.2kbps.
The data transfer from the relay can be blocked by the setting.
For the settings, see the Section 4.2.6.4.

4.6 Clock Function

The clock function (Calendar clock) is used for time-tagging for the following purposes:
• Event records
• Disturbance records
• Fault records
The calendar clock can run locally or be synchronised with the external clock such as the binary
time standard input signal, RSM clock, IEC60870-5-103 or IRIG-B (available for model 4 ∗∗
series only). This can be selected by setting.
The "clock synchronise" function synchronises the relay internal clock to the binary input signal
by the following method. A binary input Bin is assigned to SYNC_CLOCK signal (No. 2648) by
PLC. Since the BI signal is an "ON" or "OFF" signal which cannot express year-month-day and
hour-minute-second etc, synchronising is achieved by setting the number of milliseconds to zero.
This method will give accurate timing if the synchronising BI signal is input every second.
Synchronisation is triggered by an "OFF" to "ON" (rising edge) transition of the BI signal. When
the trigger is detected, the millisecond value of the internal clock is checked, and if the value is
between 0~500ms then it is rounded down. If it is between 500~999ms then it is rounded up (ie the
number of seconds is incremented).
When the relays are connected with the RSM system as shown in Figure 4.4.1 and selected "RSM"
in the time synchronisation setting, the calendar clock of each relay is synchronised with the RSM
clock. If the RSM clock is synchronised with the external time standard, then all the relay clocks
are synchronised with the external time standard.
events, fault indications, etc.
n sec
corrected to n sec
500ms
corrected to (n+1) sec
⎯ ⎯
123
6 F 2 S 0 8 2 8
(n+1) sec
t