how to trace cable fault between two AIC+

[ahsan1820]

I have two AB SLC5/05 PLC .Both PLC's have seperate AIC+ and port 3 of AIC+ is for their communication to the network.Their communication fails some times and then reestablishes by itself.I have doubt on the cable at port 3 between these AIC+,the length is 60 foot which is allowable,but the resistance it is showing is 280 ohms in each wire is that ok .please tell me how can I check if there is such an issue

[Mickey]

Is that value of resistance with the wire disconnected from both AIC's? If so that is a lot of resistance for 60 ft of wire. Can you lay a new wire just to check?

[ahsan1820]

it is resistance of two wire cores with disconnected from both sides.i have checked wires by shorting them from one side and measure from multimeter at other end

[Mickey]

Are there any terminations along the way? What size wire are you using? It still sounds like a high value for 60 ft to me. http://www.cirris.com/testing/resistance/wire.html Edited May 7, 2013 by Mickey