Specifications

Q4ARCPU Redundancy
9
Q4ARCPU system
The Q4ARCPU system has been specially
designed for process control applications
that require redundancy of PLCs and
extensive process control features. Using
state-of-the-art QnA PLC technology as its
base architecture, the Q4ARCPU has a
number of added features.
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Configurations
The most suitable basic configuration can be chosen from
the three different configurations shown as follows. The
dual system offers redundancy of power supply modules,
CPU modules and network modules and includes extensive
process control features. The dual power supply system
provides redundancy of power supply modules only with
the extensive process control features. The single system
offers the process control features, but not redundancy.
Dual CPU system
Power supply Power supply
Bus interface
Q4ARCPU Q4ARCPU Q4ARCPU
System control System control
Network Network Network Network
Dual power supply system
Power supply Power supply
I/O and special function modules
I/O and special function modules
I/O and special function modules
Q4ARCPU
Single system
Power supply
Power supply Power supply
I/O and special function modules
Power supply Power supply
I/O and special function modules
Power supply
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Math-coprocessor
The Q4ARCPU is equipped with a math-coprocessor in
addition to the dedicated ladder processor MSP. The math-
coprocessor allows the Q4AR to make floating point
mathematical calculations 10 to 100 times faster than other
CPUs.
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On-line module change
Main rack: Modules on the main rack including all CPUs
except A6RAF and the rack itself can be replaced during
on-line operations by turning the power supply for the fault
module off.
Local & remote I/O rack: Digital I/O modules and power
supply modules on a local I/O rack can be replaced when
operation is on-line. Use of a programming tool to
designate the I/O module to be replaced is necessary in
order to avoid taking the wrong input signal or giving a
wrong output signal.
Note: Special function modules on local I/O racks cannot
be replaced.
Calculation Q4ARCPU Q4ACPU A3ACPU
+ 35µs 238µs 476µs
− 35µs 241µs 482µs
× 35µs 114µs 228µs
÷ 38µs 373µs 746µs
SIN 34µs 2310µs 4620µs
COS 34µs 2460µs 4920µs
TAN 37µs 2485µs 4970µs
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