Honeywell CIU 888 - Chapter 5 Commissioning of a Redundant System Setup

Commissioning of a Redundant System Setup
Part No.: 4417584_Rev12 Configuration Manual
CIU 888 5 - 1
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CHAPTER 5 COMMISSIONING OF A REDUNDANT SYSTEM SETUP
Redundancy is a common approach to improve the reliability and
availability of a system. In a redundant CIU 888 system setup, one
CIU 888 (usually the primary CIU 888) has the active role and its
counterpart (usually the secondary CIU 888) has the passive role.
During normal operation, the CIU 888 that has the active role scans the
connected gauges for data and provides the measured and calculated
data to host systems.
If both CIU 888s in a redundant system setup are fully synchronized
and the connected host initiates a switchover, the CIU 888 that has the
active role assumes the passive role. The CIU 888 that has the passive
role assumes the active role and continues to perform the tasks that are
performed by the CIU 888 that previously had the active role.
Switchover command issued by Entis Pro via Modbus serial is one such
example.
NOTE: Refer to the Protocol Manual - Modbus and OPC UA Host (Part No. 4417588)
for more information about setting up of Modbus host for redundancy.
NOTE: The active CIU 888 can either be the primary CIU 888 or the secondary
CIU 888.
The redundancy status of the CIU 888 (active or passive) is presented
through the following (host) systems:
 Entis Pro (via Modbus RTU)
 ENTIS (via OPC UA TCP)
 Other Modbus RTU host systems
 Other Modbus TCP/IP host systems
 Other OPC UA TCP host systems
Perform the following procedure to commission a redundant CIU 888
system setup:
1. Log on to the CIU 888 and changing the initial password, see
section 5.2
2. Verify the CIU 888 license, see section 5.2
3. Configure the site using Service Tool, see section 5.3
4. Send the site configuration to the primary CIU 888, see section 5.4
5. Commission the secondary CIU 888, see section 5.5
6. Generate the INI files, see section 5.6 and Start the Entis Pro system
connected to the CIU 888, and load the INI files in Entis Pro, see
section 5.8
7. Verify the working of the system setup, see section
8. Seal the CIU 888s, see section 5.13