故障自診斷是系統可維修性設計的重要方面，是提高系統可靠性必須考慮的重要問題。自診斷主要采用軟件方法判斷故障部分和原因。不同控制系統自診斷的內容不同。PLC有很強的自診斷能力，當PLC出現自身故障或外圍設備故障，都可用PLC上具有的診斷指示功能的發光二極管的亮、滅來查找。
The GE Fanuc 90-70 IC697MEM733 provides 256 KByte, 32-bit CMOS Expansion Memory for the IC697CPU78X CPU modules. Memory on the GE Fanuc 90-70 IC697MEM733 is retained by battery on CPU. GE Fanuc 90-70 does not require additional slot.
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