990XCP98000 SQUARE D, 990XCP98000 Datasheet - Page 31

• 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

Memory structure
Modicon
automation platform
Safety CPUs
Quantum safety CPUs have two processors with different technology.
Each one executes its safety program in its dedicated memory area. The results are
analyzed at the end of each scan by two comparison mechanisms.
Each CPU has its own fallback algorithm that allows the system to be set to a
pre-determined safe state if something goes awry when a function is being executed
or if an error is detected. This dual processing is called a 1oo2 architecture (One out
of Two).
The diagram below describes the internal architecture of a Quantum safety CPU:
Sensor
Switch to fallback position configured.
Combining CPUs in this way allows dual code generation and execution, offering the
following advantages if an error is detected:
b
The diversity of compilers allows routine errors to be detected during code
generation.
b
The PLC is therefore able to detect both routine errors during code execution and
random errors.
b
The PLC can therefore detect random errors in the RAM memory.
Operating principles - CPUs
Both executable codes are generated independently.
Both generated codes are executed by two different CPUs.
Both CPUs use independent memory areas.
Quantum Safety PLC
Safety logic
®
Quantum
1oo2 internal
architecture
Application
processor
Pentium
™
Equality
Yes
No
Actuator
Stop in safe
state
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