模板屏蔽接地通常,为了方便模板屏蔽接地,使用铝质PLC基板.某些系列90-30 vo模块,到模板用户端连接器的屏蔽连接通过模板底板连接器传送到基板上。其它模块,例如CPU351,352,363,364 和374需要单独的屏蔽接地。相关的内容在以下几部分中讨论。
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