Softing FG-200 HSE/FF, User Manual

Page: 21 / 82

Chapter 3 - Installation
Version EN-112021-1.30.3
21
3.1.8 Using two FG-200
If you intend to use two FG-200 as a redundant set, connect the redundancy link interfaces (RDL) of both
FG-200 (primary and secondary) by a cable before you power up the devices. If the redundancy link is not
installed before start-up, the FG-200 will operate in non-redundant mode.
Note
As the interface is not galvanically isolated make sure that there is no potential difference
between the two connected devices.
The maximum cable length is 0.5 m according to EMC requirements. The pin assignment is:
Pin Signal Description
6 RX Receives data from redundant device
5 TX Transmits data to redundant device
4 GND Ground
Note
The receive (RX) and transmit (TX) signals must be cross-linked.
Do not power up devices when serial link is missing
If the two FG-200 forming a redundant set are powered while the serial link is missing, both devices will
behave like independent, non-redundant Primary Devices. If they operated in redundant mode before and
therefore have identical configuration information, both will use the same H1 node addresses, which will
cause problems on the H1 links. The ERR (error) LED will blink. In this case, remove the power, install the
serial link and apply the power again.
Primary device vs. secondary device
When using a redundant set of two FG-200, the device which is powered first will operate as primary
device. If both devices are powered at the same time, the one with the lower IP address will operate as
primary device.
Removing the power supply
Before you remove the power supply from the primary device make sure the secondary device is
operational. In a redundant set of FG-200, removing the power supply, the Ethernet cable or the
redundancy link interface cable from the primary device causes a redundancy change-over. Before doing
so, make sure that the secondary device is operational (and not still booting due to a prior change-over).
Otherwise the system breaks down or the configuration information might get lost. Therefore wait at least
one minute between such checks.