7 Fieldbus
Modbus quick start
Lenze · Inverter i510 / i550 - Cabinet · Operation Manual · 0.4 EN · 02/2016 99
7.2 Modbus quick start
1. General Information about Modbus
The Can communicates with the drive over the Modbus-Register Numbers. This Number access the parame-
ter registers.
The supports the following function codes:
3 (Read Holding Registers)
6 (Preset Single Register)
16 (10hex - Preset Multiple Registers)
23 - (17hex - Read/Write 4X registers)
All data in Lenze drives is only accessible via Modbus as 4X holding registers.
In Modbus the function code used defines what the leading character in the Modbus address (so the
leading 4 is not transmitted in the message).
It is important to note that Lenze complies with base 1 addressing of Modbus. So there is a 1 offset in the
address transmitted to the address requested (i.e. 0000 would be register 40001, 0001 would be 40002,
0002 would be 40003, etc.).
By default important Parameters are already mapped to Modbus Registers
Modbus Control Parameters
Drive Command Word (AC Drive Control Word)
Network Frequency Setpoint ABS[0.01Hz]
NetWordIN2 (trigger for Digital / Relay Output)
NetWordIN3 (Analog output source)
NetWordIN1 (triggers for functions in PAR0400)
NetWordIN4(Analog output source)
Modbus Drive Status Parameters (Read Only)
Drive Status Word (See bit details below)
Actual Frequency ABS [0.01Hz]
Effective power output [HIGH WORD]
Effective power output [LOW WORD]
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