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No CIP Connection

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Hi everybody, I have problems with my ethernet ring network. My Cpu is 1756-L63 with 1756-ENTR for scada and 1756 EN2TR connected with 7 station 1734-AENTR in ring. Between each stations on the ring i pluged pre-prepared cables (i mean i bought already made) from 5m to 20m max. I set all adresses ip with bootp and i desabled it. On the 1756-EN2TR i enabled supervisor mode and precedence is 1. On one station in the middle of the ring i have the indicator module status who's blinking green. so this means no cip connection, but i have to admit that i don't understand the meaning of this description/state. Is it a sofware or hardware problem? Thanks in advanced.

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