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7. Modbus TCP
Dual port ethernet option board installation manual
MN032004EN October 2017 www.eaton.com
7.1.4 Quick setup
Following these instructions, you can easily and fast set up
your Modbus for use:
In the AC drive application: Choose Fieldbus as the active
control place (see drives User’s Manual).
In the master softwaree:
1. Set the settings in the master software
2. Set the Control Word to ‘0’ (2001)
3. Set the Control Word to ‘1’ (2001)
4.
Drive’s status is RUN
5. Set the Reference value to ‘5000’ (50.00%) (2003)
6.
Actual speed is 5000 (25.00 Hz if MinFreq is 0.00 Hz and
MaxFreq is 50.00 Hz)
7. Set the Control Word to ‘0’ (2001)
8.
Drive’s s tatus is STOP
7.2 Modbus TCP – Example messages
7.2.1 Example 1 – Write process data
Write the process data 42001…42003 with command 16
(Preset Multiple Registers).
Command master – Slavee:
Address 01 hex Slave address 1 hex (= 1)
Function 10 hex Function 10 hex (= 16)
Data Starting address HI 07 hex Starting address 07D0 hex (= 2000)
Starting address LO D0 hex
No. of registers HI 00 hex Number of registers 0003 hex (= 3)
No. of registers LO 03 hex
Byte count
06 hex Byte count 06 hex (= 6)
Data HI 00 hex Data 1 = 0001 hex (= 1).
Setting control word run bit to 1.
Data LO 01 hex
Data HI 00 hex Data 2 = 0000 hex (= 0).
Data LO 00 hex
Data HI 13 hex Data 3 = 1388 hex (= 5000),
Speed reference to 50.00%
Data LO 88 hex
Error
check
CRC HI C8 hex CRC field C8CB hex (= 51403)
CRC LO CB hex
Message framee:
01 10 07 D0 00 03 06 00 01 00 00 13 88 C8 CB
The reply to Preset Multiple Registers message is the echo
of 6 first bytes.
Answer slave – Mastere:
Address
01 hex Slave address 1 hex (= 1)
Function 10 hex Function 10 hex (= 16)
Data Starting address HI 07 hex Starting address 07D0 hex (= 2000)
Starting address LO D0 hex
No. of registers HI 00 hex Number of registers 0003 hex (= 3)
No. of registers LO 03 hex
Error
check
CRC HI 80 hex CRC 8085 hex (= 32901)
CRC LO 85 hex
Reply framee:
01 10 07 D0 00 03 80 85
7.2.2 Example 2 – Read process data
Read the Process Data 42103…42104 with command 4
(Read Input Registers).
Command master – Slavee:
Address
01 hex Slave address 1 hex (= 1)
Function 04 hex Function 4 hex (= 4)
Data Starting address HI 08 hex Starting address 0836 hex (= 2102)
Starting address LO 36 hex
No. of registers HI 00 hex Number of registers 0002 hex (= 2)
No. of registers LO 02 hex
Error
check
CRC HI 93 hex
CRC LO A5 hex CRC 93A5 hex (= 37797)
Message framee:
01 04 08 36 00 02 93 A5
The reply to the Read Input Registers message contains the
values of the read registers.
Answer slave – Mastere:
Address
01 hex Slave address 1 hex (= 1)
Function
04 hex Function 4 hex (= 4)
Data Byte count 04 hex Byte count 4 hex (= 4)
Data HI 13 hex Speed reference = 1388 hex
(=5000 => 50.00%)
Data LO 88 hex
Data HI 09 hex Output Frequency = 09C4 hex
(=2500 =>25.00Hz)
Data LO C4 hex
Error
check
CRC HI 78 hex
CRC LO E9 hex CRC 78E9 hex (= 30953)