7 Serial interface (Modbus RTU)
7.1 General
DC1 Frequency Inverter
10/12 MN04020003Z-EN
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7 Serial interface
(Modbus RTU)
7.1 General
Modbus is a centrally polled bus system in which a so-called master (PLC)
controls the entire data transfer on the bus. Cross-traffic between the
individual modules (slaves) is not possible.
Every single data transfer operation is initiated by the master with a request.
Only one request can be sent on the cable at a time.
Slaves are not able to initiate transfers, and are only able to respond to
requests.
Two types of dialog are possible between master and slave:
•
The master sends a request to a slave and waits for a response.
•
The master sends a request to all slaves and does not wait for a
response (broadcast).
7.1.1 Communication
Figure 82:
Modbus network with DC1
The figure shows a typical setup with a host computer (master) and any
number (a maximum of 63 modules) of DC1 frequency inverters (slaves) .
Each frequency inverter has a unique address on the network. Addresses are
assigned individually to each DC1 frequency inverter with the P-36 parameter
and are independent of their physical connection (position) within the net-
work.
→
More information on Modbus can be found under
www.modbus.org.
Host computer
L1/L L2/N L3
U
V
W
1
2
3
4
5 6 7 8 9 10 11
1
①
②
Host computer
L1/L L2/N L3
U
V
W
1
2
3
4
5 6 7 8 9 10 11
L1/L L2/N L3
U
V
W
1
2
3
4
5 6 7 8 9 10 11
L1/L L2/N L3
U
V
W
1
2
3
4
5 6 7 8 9 10 11
2
3
63
Содержание DC1-12011 Series
Страница 1: ...Manual PowerXL DC1 Frequency Inverter 10 12 MN04020003Z EN...
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Страница 12: ...0 About this manual 0 5 Units 8 DC1 Frequency Inverter 10 12 MN04020003Z EN www eaton com...
Страница 32: ...1 DC1 device series 1 12 Service and warranty 28 DC1 frequency inverter 10 12 MN04020003Z EN www eaton com...
Страница 52: ...2 Engineering 2 5 Motor and Application 48 DC1 Frequency Inverter 10 12 MN04020003Z EN www eaton com...
Страница 190: ...9 Appendix 9 9 Sinusoidal filter 186 DC1 Frequency Inverter 10 12 MN04020003Z EN www eaton com...