GE Industrial Solutions AF-300 P11_G11 Ethernet Interface - Manual (Page 23)

Modbus/TCP 17
Modbus/TCP
This product incorporates a Modbus/TCP server according to version 1.0 of the Modbus/TCP specification.
The product listens for incoming connections on TCP port 502.
Up to 8 simultaneously connections can be set-up. A connection will be closed if no data has been exchanged
during 1 minute.
Addressing
This product supports the Modbus area for output/holding registers (4XXXX).
Register 40001-40255 corresponds to Communication No. 1-255.
Commands
The module supports the following Modbus/TCP commands:
Function
code Function name Description
3 Read multiple registers Read one ore more registers in the drive
6 Write single register Write to a single register
16 Write multiple registers Write to multiple registers
23 Read/Write registers Read and write to multiple registers with one command
Exception Codes
If a command cannot be executed an exception code is returned. The following exception codes can be
returned:
Exception
code Exception name Description
01 Illegal function The function code in the query is not supported
02 Illegal data address The data address in the query is outside the valid address
range or the address is invalid.
03 Illegal data value This code will be returned if:
1. Trying to write to a read only register in the drive or
2. The requested register cannot be changed while the drive
is running.
06 Slave device busy This code will be returned if:
1. The inverter is busy or
2. There is a communication error between the drive and the
communication adapter.