Omron CJ2 User Manual download pdf (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

1 2 3 4 5 6 7 8 9 10 ... 39 40

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