Toshiba GR200 Series Instruction Manual page 1349

Primary port selection
(ii)
The user can select any one of the ports to be the primary port although the Port A is normally
used as the primary port. For example, provided that both Port A and Port B are physically
connected to the LAN, when the user wishes to use Port B as the primary port, the user should
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 11.2-2 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
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.
Port1: Port A selected as the priority port.
Port B
Port2: selected as the priority port.
A timer starts when the primary port is ready to commence
communication after switching port.
- 1326 -
6F2S1914 (0.49)
Meaning
GRL200 (Soft 033 & 037)
Default
Fixed
5ms
None
5ms