![]() ![]() Orientation of these connectors is critical for proper grounding. Using the connectors which have drop cables guarantees the 10 feet minimum between nodes unless someone shortens the drop cable. These add 16 or 40 feet respectively to the main Modbus Plus or “trunk†cable. There are two lengths of drop cables, 8 and 20 feet that are connected to all but the MBKT type connectors. However you cannot mix the MBKT style with any of the type connectors which utilize the drop cable (all others). There are several types of connectors approved for node connections, they are: the MBKT type, the TEE type, the Ruggedized Industrial type and the newest Version, which utilizes screw terminals. You must use the approved shielded Belden cable for the network to perform properly. Modbus Plus is a continuous cable with four conductors, a twisted pair, a drain wire and a shield. One, if not the, most frequent, is exceeding the maximum allowable limit of 1500 cable feet without a repeater. Modbus Organization"> Modbus Plus is a robust network of peer to peer communications used on process control and data acquisition applications, but several basic mistakes are commonly uncovered during the certification process performed by Delta Automation, Inc.'s Field Service Engineers. Common Installation Mistakes on Modbus Plus Networks
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