Host Port Redundancy With Redundant Ciu 888S And Data Synchronization Between Host Systems - Honeywell CIU 888 Configuration Manual

NOTE: Refer to the chapter 'CIU Plus Links' in the Configuration Manual Entis Pro
C.11.2 RS-232 host port redundancy with redundant CIU 888s and data synchro-
FIGURE C-7
Part No.: 4417584_Rev12
Appendix C - Redundancy
This configuration is compliant with Entis Pro or any other modbus host
system. By issuing the appropriate Modbus command, Entis Pro can
demand to switch over to the secondary CIU 888 if the primary CIU 888
is not responding anymore and move to Com2/Port 42 to acquire tank
data. The secondary CIU 888 becomes the active CIU and its host port
becomes R/W.
2.80x for Windows (Part No. 4416381) for more information about connecting
the CIU 888 to the Entis Pro system.
nization between host systems
In this configuration, each CIU 888 in the redundant configuration is
connected to a separate host system, for example, Entis Pro (see
FIGURE C-7). The CIU 888s are connected to the host system via one
of their fixed Host ports. Each host port has its own unique RTU address
and is configured for communication through Modbus RTU on serial. By
connecting each CIU 888 to a separate instance of Entis Pro, an extra
safety is created in the event of failure of one of the two host systems.
RS-232 host port redundancy with redundant pair of CIU 888s and data synchronization
between host systems
Configuration Manual
CIU 888 C - 15