Short Setup - Lenze i55AE125B Manual

Configuring the network
Modbus RTU

Short setup

9.5.12 Short setup
In the following, the steps required for controlling the inverter via Modbus are described.
Parameterisation required
1. Activate network control:
2. Set network as standard setpoint source:
3. Set Modbus node address.
Each network node must be provided with a unique node address.
•
• Details: 4Node address setting
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: 4Baud rate setting
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: 4Data format setting
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6. Save parameter settings:
7. Switch the inverter off and then on again in order that the changed communication set-
tings can get effective.
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.
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
•
(P592.01).
In the frame, the leading 4 is omitted in the addressing process. The numbering of the reg-
•
isters 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)
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Bit 5 ≡ Activate network control
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Bit 6 ≡ Activate network setpoint
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Example of an inverter with the node address 1:
Request frame by the master
Slave address Function code
0x01 0x06
If digital input DI1 ("Start enable") is set to HIGH level, the drive should start and the inverter
should respond with the same frame as confirmation:
Response message from the inverter
Slave address Function code
0x01 0x06
292
0x2631:037 (P400.37) = "TRUE [1]"
0x2860:001 (P201.01)
^ 282
^ 283
^ 283
0x2022:003 (P700.03) = "on / start [1]".
Register address
0x08 0x34
Register address
0x08 0x34
= "Network [5]"
4Start / stop motor
^ 531
0x400B:001
Data
AC Drive control word
0x00 0x61
Data
AC Drive control word
0x00 0x61
Checksum (CRC)
0x0B 0x8C
Checksum (CRC)
0x0B 0x8C