990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 19

• 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

Presentation
(continued)
Modicon
automation platform
Safety architectures
With Hot Standby safety architectures:
b
b
b
power supply, I/O, etc.
The Hot Standby system is compatible with Unity Pro
Quantum safety CPUs with the high level of availability required by the critical
process applications, in terms of their control/command system.
At the center of the system are two Quantum safety 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 60S processor, specially
designed for Hot Standby architectures with Unity Pro XLS software. This processor
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 µm 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 that 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
they have changed over, 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 XLS software means a smooth
changeover from normal 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 a detected hardware failure.
The Hot Standby system with Unity Pro XLS software therefore increases
productivity by minimizing downtime.
Flexible architectures (continued)
Hot Standby safety architectures:
“1oo2 Hot Repair” CPU architectures
System availability can be increased significantly
Process downtimes can be eliminated because of the redundant CPUs
Redundancy is possible at every level within the architecture: CPU, wiring,
®
Quantum
™
™
XLS software, and provides
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