46 Program features
32-bit address = (4)20000 + 200 x group + 2 x index
By default, the Modbus protocol returns the internal raw 16-bit value and does not specify
any information about sign and scaling. Therefore, you must apply the correct ones for the
specified parameter.
Note: Most Modbus/TCP master applications omit the 40000 (or 400000) from the
beginning of the register numbering.
The Modbus function code 03 Read Holding Registers is supported over the Modbus/TCP
gateway of the NETA-21. In firmware 2.23 you can configure the settings of the
Modbus/TCP gateway. Go to Settings –> Device interfaces. Firmware 2.23 and above
supports a read/write option. In addition, firmware 2.24 and above supports dataset
access.
If any user tries to access read protected, write protected, or 'string' type drive parameters
via Modbus/TCP Gateway, the error 0x02 - Illegal Data Address is sent to the master.
Note: For security reasons, Modbus/TCP gateway connections must be used only inside a
trusted network.
Ethernet PC tool gateway
Drive Composer establishes Ethernet communication only with recognized devices such
as FENA-11 and FENA-21 Ethernet fieldbus adapters.
The PC tool friendly mode should be enabled in NETA-2 if NETA-21 and Drive Composer
are used at the same time through Ethernet. To enable PC tool friendly mode, go to
Settings –> Device interfaces –>Ethernet/Settings –> PC tool friendly mode.
Drive Window PC tool can connect to UDP port 61332 on NETA-21 and access connected
drives through the Ethernet gateway. When a connection is active, normal
communication from NETA-21 web user interface to the drive is suspended.
Note: For cybersecurity reasons, all Ethernet PC tool gateway connections ( and Panel
bus) must be used only inside a trusted network.
Device
Modbus
mb_3
Device
Panel bus {2} {1}
pnl2_01
NETA-21 Switch
PC
Modbus device, parameter 01.15
ID: 99
Address: 115
Panel bus (port PNL2) device ID 1,
parameter 03.10 using 32-bit addressing
ID: 65
Address: 420000 + 200 x 3 + 2 x 10 =
420620
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