Omron CPU Unit CJ2 Manual page 5

High-speed System I/O Throughput
Improved basic performance enables fl exible
machine control.
Ample Instruction Execution Performance
for Machine Control
The CJ2 Series fully responds to customer
requests for improvement and
increased information.
» System Overhead
Common processing 200 µs
Interrupt response: 30 µs
» Basic Instructions
LD instruction execution: 0.016 µs
OUT instruction execution: 0.016 µs
» Floating-point Math
SIN calculation: 0.59 µs
Floating-point decimal addition and
subtraction: 0.24 µs
Faster I/O Refreshing Using the Burst
Transfer Method
I/O refreshing between an EtherNet/IP Unit and
the CPU Unit is now performed at high speed
using the even faster and higher-capacity data
links for EtherNet/IP. This method is standard
for the CJ2 CPU Units. I/O refreshing is now
performed at up to 2.4 times the speed of
previous Communications Units.
I/O refresh speed
CJ2
(for 1,000 words)
CJ1
EtherNet/IP
» I/O Refreshing
16-point Basic I/O Unit: 1.4 µs
8-point Analog Input Unit: 50 µs
NEW
2.4
Times
2.4
330µs
X
800 µs
Burst transfer
High-speed, high-capacity
Faster Immediate I/O Refreshing
Immediate refreshing of basic I/O is also faster.
Real-time inputs and outputs while instructions
are being executed are up to 20 times faster
than before.
(Example: !LD instruction speed improved from 20 µs to 1 µs)
Fiber Sensor
Sensor status is read
E3X-DA
just prior to instruction
execution.
Automatic User Memory Recovery
Finer memory production processes have been
accompanied by problems such as bit corruption
caused by cosmic rays. With the CJ2 CPU Units,
corruption in the user program is detected and the
program recovered in real time before program
execution. This reduces equipment down time by
minimizing the number of times that operation is
stopped due to memory errors.
Cosmic rays
User program
data is corrupted
Previously
Cosmic rays
(Thermal neutrons)
User program
data is corrupted
CJ2
20
Times
Air cylinder
CJ2 CPU
Output immediately
after instruction is
executed
Operation is stopped due
to memory error.
Data is automatically
restored and normal
operation continues.
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