Omron CPU Unit CJ2 - Manual (Page 5)

5
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.
I/O refresh speed
(for 1,000 words)
CJ2
CJ1
330µs 2.4
X
800 µs
Air cylinder
Previously
CJ2
Cosmic rays
User program
data is corrupted
User program
data is corrupted
Operation is stopped due
to memory error.
Data is automatically
restored and normal
operation continues.
Cosmic rays
(Thermal neutrons)
EtherNet/IP
Burst transfer
High-speed, high-capacity
CJ2 CPU
Sensor status is read
just prior to instruction
execution.
Output immediately
after instruction is
executed
Fiber Sensor
E3X-DA
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.
NEW
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
2.4
Times
» I/O Refreshing
16-point Basic I/O Unit: 1.4 µs
8-point Analog Input Unit: 50 µs
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)
20
Times