Commissioning of a Redundant System Setup
Ensite Pro to CIU 888 Migration Manual
Part No.: 4417593_Rev09
3 - 6
CIU 888
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Entis Pro). Each pair is connected to the host system via one of the four
host ports of the CIU Plus. A configured host port has its own unique
RTU address and enables Modbus on serial communication.
FIGURE 3-4
Schematic representation of a site with a redundant pair of CIU Plus and CIU Prime
(Redundant host systems)
On the CIU Prime, a maximum of four field ports are available to
connect to the tank gauging instruments. The field ports can be
configured for GPU on Bi-Phase Mark communication or GPU on serial
communication.
In each pair, the CIU Prime and the CIU Plus are connected to one
another via one of the host ports of the CIU Prime and one of the field
ports of the CIU Plus.
NOTE: A cross-connection between the two pairs, in which the primary CIU Plus is
connected to the secondary CIU Prime and the secondary CIU Plus is
connected to the primary CIU Prime, is not supported.
