990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 90

• Manufacturer Part Number: 990XCP98000
• Description: QUANTUM CPU BATTERY FOR S
• Manufacturer: SQUARE D

Specifications of 990XCP98000

• Rohs Compliant: YES
• Battery Capacity: 1800mAh
• Battery Technology: Lithium
• Battery Voltage: 3V
• Battery Terminals: Connector
• Weight: 0.12lb

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Modicon
automation platform
Hot Standby system
Unity Pro
The Hot Standby system is compatible with Unity Pro
Quantum CPUs with the high level of availability required by the most critical
applications, in terms of the availability of their control system.
At the center of the system are two Quantum PLC racks, commonly known as the
“Primary” PLC and the “Standby” PLC. Their hardware configurations must be
identical (same modules in each local rack). The key element, on each of them,
is the 140 CPU 671 60 CPU, specially designed for Hot Standby architectures with
Unity Pro software.
This CPU is a double-slot module that combines the central processor unit function
with that of the redundant coprocessor in the same housing.
The “Primary” PLC executes the application program and controls the I/O. The
“Standby” PLC stays in the background, ready to take over if necessary. The
“Standby” PLC is connected to the “Primary” PLC via a high-speed fiber optic link
(100 Mbps) integrated in the CPU.
This fiber optic link (62.5/125 multimode) can be extended to 2 km without any
additional special equipment. It is via this that the user application data is updated
cyclically on the “Standby” PLC.
In the event the “Primary” PLC becomes inoperative, the standby system switches
over automatically, changing execution of the application program and control of the
I/O over to the “Standby” PLC, with an up-to-date data context. Once the changeover
is complete, the “Standby” PLC becomes the “Primary” PLC. Once the faulty PLC
has been repaired and reconnected to the standby system,
it takes the role of the “Standby” PLC.
Using the Hot Standby system with Unity Pro software means there is a smooth
changeover from primary to standby at the outputs. The changeover is transparent
for the process, which will continue to be managed without any permanent ill-effects
from the occurrence of inoperative hardware. The Hot Standby system with Unity
Pro software therefore increases productivity by minimizing downtime.
Presentation
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software, and provides