| 摘要 |
A common library stores therein user function blocks and ready-made protected function blocks. By being manipulated by the user, an editing device links some of function programs stored in the function blocks in the library to form a control program which controls the exchange of signals between I/O modules and external devices. A control section in the terminal device allows the alteration of the function programs included in the user function blocks, but inhibits the alteration of the function programs included in the protected function blocks.
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