China to keep RMB exchange rate stable
Apr. 20, 2009 (China Knowledge) - China will adhere to its policy to keep the exchange rate of the Chinese currency basically stable at a reasonable and balanced level, said Jiang Yu, spokeswoman of the Foreign Ministry, at a press conference on Thursday.
China will continue its reform of the RMB exchange rate mechanism to achieve [...]
The Components of PLCs Work
The components that make a PLC work can be divided into three core areas.
The power supply and rack
The central processing unit (CPU)
The input/output (I/O) section
PLCs come in many shapes and sizes. They can be so small as to fit in your shirt pocket while more involved controls systems require large PLC racks. Smaller PLCs (a.k.a. [...]
Mitsubishi reveals integrated safety relay
News from Mitsubishi Electric Automation Systems:
Mitsubishi’s approach to safety relays closely integrates the standalone protection and performance of safety circuits and the diagnostic capability of the PLC.
This is achieved either by incorporation of the QS safety relay onto the PLC rack, or by direct high-speed CC-Link for the standalone networked version.
This configuration means that [...]
History of PLC
Origin
The PLC was invented in response to the needs of the American automotive manufacturing industry. Programmable controllers were initially adopted by the automotive industry where software revision replaced the re-wiring of hard-wired control panels when production models changed.
Before the PLC, control, sequencing, and safety interlock logic for manufacturing automobiles was accomplished using hundreds or thousands [...]
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