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Elpro Technologies 450U-E Wireless Ethernet Modem & Device Server User Manual
Rev Version 1.4.0 www.cooperbussmann.com/wirelessresources 45
Modbus TCP Client Mappings:
Local Register
Enter the starting onboard I/O register number that the specified Modbus Master
transaction will transfer I/O to/from.
I/O Count
Specify the number of consecutive I/O registers to be transferred for the specified
transaction.
Function Code
Specify the Modbus Function Code for the transaction.
Destination Register
Enter the starting I/O register number in the destination device that the specified Modbus
Master transaction will transfer I/O to/from.
Device ID
Enter the Modbus Device ID of the destination Modbus device
Server IP Address
Specify the IP Address of the destination Modbus TCP Server for the specified
transaction.
Sever Port
Server Port number used for Modbus TCP. Default/standard port number is 502
Response Timeout
Enter the timeout (in milliseconds) to wait for a response to the specified transaction.
Response time should be configured in conjunction with the Response time for the serial
ports if utilising TCP to RTU communications.
Comm Fail Register
Enter the onboard I/O Register number to store the communication status of the specified
transaction. The Specified register will be set to 0 if communications is successful,
0xFFFF if there is no connection to the specified server, or 0xFFxx where xx is the
Modbus Exception Code
Note: When entering the Local or Destination registers you do not need to enter in the full Modbus
Address, i.e. 30001 or 10001 only the I/O address is needed as the Function Code determines what
type of command is being used.
E.g. if you wish to read from Destination register 30001 you need to select Function Code 04: Read
Inputs and then enter the Destination Register of 1.
Or if you wish to read register 10501 you need to select Function Code 02: Read Discretes and then
enter the Destination Register of 501.
TCP Mapping Example
The system in Figure 47 below shows that Unit B is a Modbus TCP Client that will poll the TCP server at Unit C via the
Wireless Ethernet interface to gather the status of the on board DIO (Digital Input) which will then be reflected on its own
DIO (Digital Output).
Figure 51 Modbus Example
Figure 50 - Modbus TCP Client Mapping