990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 20

• 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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Presentation
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(continued)
Modicon
automation platform
Safety architectures
Example of architecture with redundant or non-redundant safety I/O
A Hot Standby architecture enables safety and availability to be combined in a single
PLC. This type of architecture helps to ensure that even if one of the CPUs becomes
inoperative, the system still provides SIL2 safety. Since Quantum safety PLCs are
based on the same Hot Standby architecture as standard Quantum PLCs, the
solution is indisputably robust and has proved its worth in the field.
Thanks to the “1oo2” design of safety CPUs (see page 1/22), they represent a simple
and cost-effective solution compared to multiprocessor solutions with 3 CPUs and
voting for control between one another with external equipment. The complete
redundancy of functions, from the I/O through to the supervision system, has the
advantage of being able to tolerate more than one error while still maintaining the
required level of functional safety.
Particularly well suited to designing production systems that combine safety with
availability and cost-effectiveness, the solution is the at the heart of TÜV Rheinland's
“1oo2 Hot Repair” architecture concept.
These architectures use two 140 CPU 671 60S connected via fiber optic link. The
safety I/O modules are placed in the RIO drops to allow control by both CPUs.
For information on the connections, see pages 3/5 and 3/6.
The Quantum safety high availability CPU differs from the standalone CPU
140 CPU 651 60S in its use of the Ethernet port. In a standalone configuration, the
Ethernet port is used for communication with other devices via standard Ethernet
cables. In a high availability safety configuration, it is used for data exchanges
between the primary and standby controllers via fiber optic link. Since this fiber optic
link is not part of the safety loop, the PFD and PFH values for the high availability
CPU are the same as those for the standalone CPU.
Flexible architectures (continued)
“1oo2 Hot Repair” architecture
Details
Fiber optic link
®
Quantum
Fiber optic link
™
Redundant modules