WebRelay™ is an electro-mechanical relay with a built-in web server. The web server allows 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 optically-isolated input can be viewed. Alternatively, a computer or industrial controller can send control messages to WebRelayTM or monitor its state by requesting an XML status page. Another very useful option is to use two WebRelayTM 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, or to allow 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.WebRelayTM 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, and the control page can be set up to be password protected.The unit requires a 5VDC power supply (500mA min). Alternatively, WebRelayTM can be purchased with a power over ethernet option which allows it to be powered over the ethernet line using an 802.3af power injector. The power over ethernet option is useful when a 5V power supply is inconvenient or unavailable.The relay contacts are SPDT and are rated at 10A. The control input is optically isolated and requires 5-12VDC.WebRelayTM plugs directly into a standard 11-pin octal type relay socket (not included). Wall mount and DIN-rail mount sockets are available. Typical applications include industrial control, remote monitoring, home automation, etc.WebRelayTM is priced at $95 US. For more information see www.ControlByWeb.com or call Dave Witbeck at Xytronix Research & Design, Inc. (435) 750-5999.
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