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from the Technical project Mangment department...
Problem with Modbus serial repeaters
Local and wide area networking in factory automation. topic
Posted by Medhat on 16 August, 2008 - 1:20 pm
I am working in a project using premium PLC as a master to control 10 Zelio slave PLCs, the Zelios are far apart from the premium PLC so I used 2 repeaters (Phoenix Type) and arranged the repeaters according to the distances (not to be more than 1200M) the repeaters contain internal terminating resistors I changed the terminating resistors position and each time some RTUs can't be detected , the best case I detected 9 zelios but still one not deteceted

Please send me the right configuration of the terminating resistors for this application
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