Modbus RTU
Modbus is an internaonally approved, asynchronous, serial communicaon protocol,
designed for commercial and industrial automaon applicaons.
General informaon
Design Oponal
Integrated in standard I/O
DC supply of the control electronics
and oponal eldbus
internally via the inverter Mains-dependent
oponally:
External supply
Mains-independent
24 V DC
at X3/24E...GND
Bus-related informaon
Name Modbus RTU
Communicaon medium RS485 (EIA)
Use Connecon of the inverter to a Modbus
network
Connecon system pluggable double spring terminal
Status display 2 LEDs
Connecon designaon X216: TA, TB, COM
Technical data
Communicaon prole Modbus RTU
Bus terminang resistor Ω 120 Terminated on both sides
integrated bus terminang resistor Yes Acvaon via DIP switch
Network topology
Without repeater Line
Staon
Type Slave
Max. number without repeater 32 per bus segment, incl. host system
Max. number with repeater 90
Address 1 ... 247 Adjustable via code or DIP switch
Baud rate kbps 4.8 … 115 Adjustable via code or DIP switch, alterna-
vely automac detecon via DIP switch
can be acvated
Max. cable length m 12 ... 600 Per bus segment, depending on the baud
rate and the used cable type
Max. cable length between two nodes not limited, the max. bus length is deci-
sive
Data channel
SDO channels Max. 2 servers, with 1 … 8 bytes Supported funcons:
Read Holding Registers
Preset Single Register
Preset Mulple Registers
Read/Write 4 x registers
Communicaon me
Communicaon me depends on
Processing me in the inverter Time between the start of a request and
arrival of the response
Telegram runme (baud rate, telegram
length)
Nesng depth of the network
Bus load
Processing me of process data
Update cycle, mulple of ms 10 In the inverter
Processing me ms 0 ... 1
applicaon task runme of the technology appli-
caon used (tolerance)
ms 1 ... x
Product extensions
Networks
Modbus RTU
224
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