Подскажите, пожалуйста, как перевести следующие термины:

- Fixed-field commands. Контекст: "the expansion of the language is not subject to any limits that may instead result from languages provided with fixed-field commands".

- the I/Os. "The CNC and the PLC can interact and, of course, care is required when using shared tools such as the display, the variables or the I/Os".

- CNC block. "As a result, the PLC is provided with its own local variables, as well as the PLC PERM, the CNC, each CNC block etc.".

Огромное всем спасибо.