C.4 Connecting to a Network C.4 Connecting to a Network This section explains the connection of a drive to a MEMOBUS/Modbus network and the network termination. u Network Cable Connection Follow the instructions below to connect the drive to a MEMOBUS/Modbus network. 1. With the power shut off, connect the communications cable to the drive and the master. Use the terminals shown in the figure below for network cable connections. S– S+ IG R– R+ Figure C.2 Serial Communications Cable Connection Terminals Note: Separate the communications cables from the main circuit cables and other wiring and power cables.
Use shielded cables for the communications cables, and properly shielded clamps to prevent problems with noise. When using RS-485 communications, connect S+ to R+, and S- to R- as shown in the diagram below. 2. Check or set the terminating resistance at all slaves. Refer to Network Termination for Network Termination on SI-485/J. 3. Switch the power on. 4. Set the parameters needed for serial communications (H5-01 through H5-07, -12, -13) using the LED operator. 5. Shut the power off and wait until the display on the LED operator goes out completely. 6. Turn the power back on. 7. The drive is now ready to begin communicating with the master.
u Wiring Diagram for Multiple Connection Figure C.3 and Figure C.4 explain the wiring diagrams for multiple connections using MEMOBUS/Modbus communication. n RS-485 Interface S+ S– IG R+ R– R+ R– IG S+ S– SI-485/J Drive PLC S2 Terminating Register OFF R+ R– IG S+ S– SI-485/J Drive S2 Terminating Register OFF R+ R– IG S+ S– SI-485/J Drive S2 MEMOBUS/Modbus Communications Terminating Register ON Figure C.3 RS-485 Interface Note: • Turn on the DIP switch at the SI-485/J that is located at the end of the network. Turn it off at all other slaves. • Set H5-07 to “1” when using the RS-485 interface.
C SIEP C710606 33A OYMC AC Drive – J1000 User Manual 189 S- Send (-) S+ Send (+) IG Shield Ground R- Receive (-) R+ Receive (+)