The WebRelay is an electromechanical relay with a built-in web server that enables the relay to be controlled remotely via the Internet or a local Intranet. Using a standard web browser, the relay can be controlled and monitored or the state of an input can be viewed. Alternatively, a computer or industrial controller can send control messages to the WebRelay or monitor its state by requesting an XML status page. Another useful option is to use two WebRelay units in conjunction and apply a control voltage to one unit, which in turn controls the relay contacts of another unit at a remote location. This configuration can be used to extend the output of a PLC to another building. It also can be used to enable an electrical switch to control a device in another city.

The optically isolated input can be used to control the relay, control a remote relay, or simply to monitor a discrete device. WebRelay comes ready to use and requires no programming. A configuration web page is used to set up the necessary parameters and to build a custom control page. The configuration page is password protected. You can set up the control page to be password protected.

The unit requires a 5-VDC power supply (500 mA minimum). Alternatively, you can purchase WebRelay with a power-over-Ethernet option that enables it to be powered over the Ethernet line using an 802.3af power injector. The power-over-Ethernet option is useful when a 5-V power supply is inconvenient or unavailable.

The relay contacts are SPDT and rated at 10 A. The control input requires 5 to 12 VDC. The Web-Relay plugs directly into a standard 11-pin octal-type relay socket (not included). Wall mount and DIN-rail mount sockets are also available.

The WebRelay costs $99.

Xytronix Research & Design, Inc.
www.ControlByWeb.com