Lenze i510 - Modbus; Modbus Introduction; Modbus Node Address

8.5 Modbus
Modbus is an internaonally approved, asynchronous, serial communicaon protocol,
designed for commercial and industrial automaon
applicaons.
Informaon about the dimensioning of a Modbus network can be found in the
conguraon document for the inverter.
Precondions
•
Con
tr
ol unit (CU) of the in
v
ert
er is provided with Modbus/CANopen.
•
Modbus/CANopen selector at the inverter front is set to "Modbus".
8.5.1 Modbus introducon
•
The process of data transmission disnguishes between three dierent operang modes:
Modbus ASCII, Modbus RTU, and Modbus TCP. The in
verter supports the Modbus RTU oper-
ang mode ("Remote Terminal Unit").
•
The Modbus protocol is based on a master/slave architecture where the inverter always
works as slave.
•
The Modbus network only permits one master (at a me) sending commands and requests.
The master is also the sole instance to be allowed to iniate Modbus communicaon. No
direct communicaon takes place between the slaves.
•
The physical interface corresponds to TIA/EIA-485-A which is very common and suitable for
the industrial environment. This interface enables baud rates from 2400 to 115200 kbps.
•
The inverter supports Modbus funcon codes 3, 6, 16 (0x10) and 23 (0x17).
8.5.2 Modbus node address
Each network node must be provided with a unique node address.
Details
•
The node address can be set in 0x2321:001 (PAR 510/001).
•
The
seng that is acve when the invert
er is switched on is the eecve seng.
•
The node address 0 is reserved f
or messages to all nodes ("Broadcast") .
•
The acve node address is shown in 0x2322:001 (PAR 511/001).
Parameter Name / value range / [default seng] Info
0x2321:001
(PAR 510/001)
Modbus sengs: Node ID
(Modbus se.: Node ID)
1 ... [1] ... 247
Seng of the node addr
ess.
•
A change in the node address only becomes eecve aer a restart of
Modbus communicaon.
0x2323
(PAR 509)
DIP switch posion
(DIP switch)
•
Read only
Display of the DIP switch seng at the last mains power-on.
Conguring the network
Modbus
Modbus introducon
127
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