Honeywell CIU 888, Руководство по миграции

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Commissioning of a Redundant System Setup
Part No.: 4417593_Rev09 Ensite Pro to CIU 888 Migration Manual
CIU 888 3 - 1
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CHAPTER 3 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 there is a valid condition for 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
were 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 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 serial (commands both CIU 888s)

Other Modbus host systems

CIU 888 display
The procedure for the commissioning of a redundant CIU 888 system
setup consists of the following steps:
1. Running the initial setup of the primary CIU 888, see section 3.2
2. Setting up the site configuration and generating INI files, see
section 3.3
3. Uploading the site configuration to the primary CIU 888, see
section 3.4
4. Configuring the additional configuration settings of the primary
CIU 888, see section 3.5
5. End commissioning of the primary CIU 888, see section 3.6
6. Commissioning of the secondary CIU 888, see section 3.7
7. Updating the INI files, see section 3.8
8. Restarting the Entis Pro system connected to the CIU 888, and
loading the updated INI files in Entis Pro, see section 3.9
9. Sealing the CIU 888s, see section 3.10