Softing FG-200 HSE/FF, Руководство пользователя

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FG-200 HSE/FF Modbus - User Manual
52
Version EN-112021-1.30.3
The two devices forming a redundant set communicate via a redundancy link interface and via Ethernet.
The serial line is used to establish a redundant set of devices, to exchange signs of life, and to control
redundancy switch-over, while the Ethernet is used to transfer configuration information from the primary
device to the secondary device. Therefore an operational serial communication path and an operational
Ethernet path between both devices are required for proper operation.
The two physical Linking Devices forming a redundant set of devices are determined by the serial link
between them. Without that serial link, both devices operate like independent, non-redundant Primary
Devices.
7.2 Fault domain
The shaded area in the figure above shows the fault domain. Faults within the fault domain can be
detected and covered by the redundancy features. Those are:
§
permanent faults within the Linking Device - (1)
§
transient faults within a Linking Device that lead to loss of functions - (1)
§
a loss of the serial connection between the two Linking Devices - (2)
§
a failure in the Ethernet communication between the two Linking Devices - (3)