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Important
The final part of the RS-485 installation process is the Modbus network
configuration. These steps should be completed by the Modbus network programmer.
The last two steps are:
• Setting the device addresses so the Modbus master program will accept the
Modbus addresses assigned during the field installation
• Configuring point maps for slave devices
Network Layout
When multiple inverters or other Modbus slave devices are connected to a single
Modbus master device, the multiple devices need to be connected in one of the three
daisy chain layouts shown in the following figure.
Figure 6‑4. Daisy chain layout for RS-485 network: option A
Figure 6‑5. Daisy chain layout for RS-485 network: option B
Figure 6‑6. Daisy chain layout for RS-485 network: option C
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Important
When multiple devices are wired to the network, the network shield must be
terminated to earth ground at one point on the network, typically at the
beginning or the end. For device connections the shield must be rewired to
provide a continuous shield and isolated from ground.
570-1001791-05A
The contractor responsible for network programming will need to
provide the slave addresses prior to setting the Modbus address for each
slave inverter.
Data Monitoring and Controls
Advanced Energy® AE 500 Inverter
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Troubleshooting
