系列90-30 PLC有两种可能的通电顺序,一种是“冷通电”,另一种是“热通电”。CPU通常采用冷通电顺序。然而,在331型和更高级系统中,如果在断电与下次通电之间少于5秒,则采用“热通电”顺序。通电-次冷通电由下列七个顺序组成:注意除了第1步跳过外,热通电顺序与冷通电顺序相同。

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