High-speed System I/O Throughput NEW
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
»
Faster I/O Refreshing Using the Burst
Transfer Method2.4
Times
I/O refreshing between an EtherNet/IP Unit and the CPU Unit is now performed at high speed using the even faster and
I/O refresh speed | CJ2 | 330µs 2.4X |
(for 1,000 words) | CJ1 | 800 µs |
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Burst transfer
EtherNet/IP
»I/O Refreshing
Faster Immediate I/O Refreshing | 20 | |
Times | ||
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Immediate refreshing of basic I/O is also faster.
(Example: !LD instruction speed improved from 20 µs to 1 µs)
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| Air cylinder |
Fiber Sensor |
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| CJ2 CPU |
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Sensor status is read | Output immediately |
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just prior to instruction | after instruction is |
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| execution. | executed |
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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 | Operation is stopped due | |
to memory error. | ||
data is corrupted | ||
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Previously
Cosmic rays | Data is automatically | |||||||||||
(Thermal neutrons) | ||||||||||||
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| User program | restored and normal | |||||||
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| data is corrupted | operation continues. | |||||||
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CJ2
5
