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How we can perform cold start during power cycle of M340 CPU.

Giving power cycle to CPU is not a cold start , however it will be counted as a warm start. 

To enable cold start during power cycle, you need to select the cold start only check box in CPU configuration using unity pro software. 

Cold Start Only: 

If checked, this option forces the cold start of the application, instead of the normal warm start upon power cycle of the PLC. 
By default, the Cold Start Only option is unchecked. 
The Cold Start Only option is only supported since PLC V2.7 
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