8.6.12. Short setup of Modbus RTU
In the following, the steps required for controlling the inverter via Modbus are described.
Parameterisation required
1. Activate network control: 0x2631:037 (P400.37) = "TRUE [1]"
2. Set network as standard setpoint source: 0x2860:001 (P201.01) = "Network [5]"
3. Set Modbus node address.
• Each network node must be provided with a unique node address.
•
Details:
Modbus RTU node address
221
4. Set Modbus baud rate.
• Default setting: Automatic detection.
• If the automatic baud rate detection function is activated, the first 5 ... 10 messages
are lost after switch-on.
•
Details:
Modbus RTU baud rate
221
5. Set Modbus data format.
• Default setting: Automatic detection.
• If the automatic data format detection function is activated, the first 5 ... 10
messages are lost after switch-on.
•
Details:
Modbus RTU data format
221
In the default setting, the digital input DI1 is assigned with the "Run"
function. If the network control is activated, this function serves as "start
enable" for start commands via network. Hence, the digital input DI1 must
be set to HIGH level in
order that the motor can be started via network.
Start / stop motor
363
Starting/stopping the drive via Modbus
For starting/stopping the drive, Modbus register 42101 can be used.
• Modbus register 42101 is permanently assigned to the AC Drive control word
0x400B:001 (P592.01).
• In the frame, the leading 4 is omitted in the addressing process. The numbering of the
registers starts with 1; addressing, however starts with 0. Therefore the address 2100
(0x0834) is used in the frame when register 42101 is written.
Bits set in the AC drive control word:
• Bit 0 ≡ Run forward (CW)
• Bit 5 ≡ Activate network control
• Bit 6 ≡ Activate network setpoint
Example of an inverter with the node address 1:
Request frame by the master
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