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I have 140 CPU 671 60 in hot standby configuration. In the diagnostics Viewer (Unity Pro), the error symbols shows " ETH Device Failure" with Text ID 13010 ?

It is a 140CPU67160 known error V 2.70 

Solution :- 
kindly update the CPU Fimware & Copro to V3.20 & 3.10 ( firmware versions 3.20 must be used with Copro version 3.10 ) 

Find attached 

Procedure related to firmware Upgrading a Quantum Hot Standby PLC refer Section 5 & Appendix 4 
Kindly Refer section 5. Page no 50 follow same steps. 

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