Description

The Modbus TCP Server interface lets ibaPDA act as a server that expects a client connection. The PLC acts as client and requests a connection to ibaPDA. ibaPDA will not request information; it only listens to information that is sent over the network on port 502.

Up to 64 connections can be used per interface license. By purchasing up to 3 one-step-up licenses, the number of connections can be increased up to 256.
Interface configuration

Network interfaces

Using this drop-down list, you can select which network adapters on your computer are used for this interface. The sockets will be opened for communication only on the selected network adapters. In case a network adapter has multiple IP addresses configured, a socket will be opened for all of these IP addresses. At least one network adapter should be selected to get the interface configuration validated. If you select None, an error message will be displayed when validating the I/O configuration. By default, the option All is selected.

Use the network byte order on network

This option is enabled by default because the default byte order for data transfer over the Modbus TCP/IP network is Big Endian.

    • Swap float values on word base When using the default settings, you can optionally change the swap mode for float values to the Real module type. The telegram header is not affected.

Use little-endian byte order on network

This option should be used if the client is based on a little-endian machine.

Swap digital signals

If you enable this option, then the bytes are swapped only in the digital grids of the real and integer module types. The module types, Dig512 and generic, are not affected by this.

Send response to Modbus client

If you enable this option, then each telegram is acknowledged with a response telegram. The response message mirrors the MBAP header, function code, starting address and data volume.

Ignore sequence counter

If ibaPDA detects that the sequence counter (Transaction Identifier) is not continuously incremented, it displays "Sequence error" in the connection table. Enabling this option removes the sequence counter columns from the connection grid.

Allow ports through firewall

When installing ibaPDA, the default port numbers of the used protocols are automatically entered in the firewall. If you change the port number or enable the interface subsequently, you have to enable this port in the firewall with this button.
Connection table

Address

This is the IP address of the source computer from which ibaPDA receives data.

Module index

The module index indicates which module number in ibaPDA should be assigned to this connection. The module index must be configured in the source system, e.g. ABB, ibaLogic. This module index must correspond to the entry in the field, Module index, in the corresponding module of the I/O Manager (module level, General tab). If necessary, adjust the module index on the source page or in ibaPDA.
Available modules

  • Modbus Generic

  • Modbus Dig512

  • Modbus Integer

  • Modbus Real
Product name

ibaPDA-Interface-Modbus-TCP-Server (Art. no. 31.001020)