W&T connects
Interfaces for TCP/IP, Ethernet, RS-232, RS-485, USB, 20mA, glass and plastic fiber optic cable, http, SNMP, OPC, Modbus TCP, I/O digital, I/O analog, ISA, PCI

Modbus meets Web-IO

The W&T Web-IO provides a bridge between Modbus TCP and the most common Web technologies.


Sending alarms with Modbus:
Master writes to the register - Web-IO sends e-mail

Equipment controlled via Modbus is mostly found in closed systems. The equipment is monitored using a host computer on which special or critical operating states are displayed and signaled. More...

The new generation of Web-IO Boxes provides the Modbus master with up to 12 virtual registers (coils) depending on the model. Setting these registers does not change anything in the actual IO status of the Web-IO, but an internal alarm is generated. When alarms are present the Web-IO informs the user via e-mail, SNMP trap or syslog depending on the configuration. It is also possible to log the alarms via FTP.

In this way the Modbus master can even signal operating states across different locations.

Modbus meets web

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Modbus in the browser:
The Web-IO brings process data written by the master into the browser

Modbus systems are generally monitored using host computers on which specially adapted visualization software is installed. This limits the number of workstations which allow viewing into the system. More...

The new generation of Web-IO Boxes opens the way to modern web technologies for Modbus.

The Web-IO provides 128 bytes of freely writable memory in the form of virtual registers. The Modbus master can write any desired amount of process data to these registers. Using simple HTTP requests these process data can be read out by Web applications and displayed in the browser.

A table format display of the register contents is already implemented in the Web-IOs. Using JavaScript, AJAX or PHP the process data can be post-processed and graphically displayed.

Visualize Modbus in browsers

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Switching with Modbus TCP:
Access to digital inputs, outputs and counters

The new Web-IO generation enables reading of input/output status and counters and, depending on the model, switching of up to 12 outputs. More...

Switch with Modbus TCP

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Modbus and Web:
Combining systems with Web services

With Modbus TCP the W&T Web-IO boxes now support an additional protocol from automation technology. More...

Integrating into existing systems is child’s play thanks to the standardized Modbus protocol.

Modbus with web services

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More information: Data sheets, online ordering and manual

Do you not yet have a Web-IO but would like to simply try out the above applications?
No problem: We will provide you with a Web-IO Digital 4.0 at no charge for 30 days. Simply use the following links to a data sheet and place a sample order. We will ship the Web-IO for testing against an open invoice. If you return the unit within 30 days, we will credit the invoice in full.