Toshiba GR200 Series Instruction Manual page 532

set Port2(i.e., Port B) for the [PrimaryPort]. If the user wishes not to select the primary port,
set None for the [PrimaryPort].
Llink-down timer
(iii)
As mentioned earlier, the occurrence of a communication failure is determined when the timer
exceeds the setting [DownTime]. Thus, the user should set a time setting for this decision.
Link-up timer
(iv)
Another timer is provided in the Hot-standby function. Let us assume that the communication
on Port A is changed to Port B. If the failure of Port A is removed after changing to Port B, the
IED will try to re-start using Port A as the primary port. In this case, the user can define a
time to revert to the original port and re-start communication on the original port by applying
a re-start time for setting [UpTime].
Table 10.2-2 Summary of Hot-standby communication setting
Setting Items Range
Fixed /
RedundantMode
Hot_Standby
DownTime 0–10000ms
None / Port1 /
PrimaryPort
Port2
UpTime 0–10000ms
The user should be aware of the following three facts prior to the Hot-standby operation:
1 The IED uses the IP/MAC address of Port A for the Hot-standby operation. The
IP/MAC address of Port B is not used even if communication is carried out on Port
B.
2 The user should ensure that an optical fiber is correctly connected when a 100Base-
FX module is used, otherwise a repeat communication failure (link-down) will be
experienced continuously. If the period for which the link-down is shorter than the
setting [DownTime], another port cannot be switched as the primary port. Thus,
the user should determine the setting value to be applied for [DownTime] on the
basis of the system requirement. It is allowable for the user to apply a setting of
zero for [DownTime] so that the switching of the ports will be performed
immediately; conversely, the user can set any value less than 3000ms in order that
the system need not experience chattering failures if the optical fiber were not
connected securely. Switching between the primary and the secondary ports is not
Fixed: Hot-standby is not activated..
Hot_Standby: Hot-standby activated.
A timer starts upon the occurrence of the communication
failure (link down). The standby port commences
communication in the DownTime.
Selection of priority port
selection
None: No for the priority port.
Port A
Port1: selected as the priority port.
Port2: Port B selected as the priority port.
A timer starts when the primary port is ready to commence
communication after switching port.
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Meaning
Centralized GRB200
(Soft: 030, 031, 032, 033, 034)
6F2S1931 (0.20)
Default
Fixed
5ms
None
5ms