Digital and analogue I/O modules have built-in web servers

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By eeNews Europe

Setup is simple, fast and cost-effective, with no special software to download, no drivers to install, no batteries to change and no monthly licensing fees. ControlByWeb modules can be assembled into an unlimited range of remote control, data acquisition, remote monitoring and industrial automation applications. The ControlByWeb family is exemplified by the WebRelay-Quad Ethernet Relay Unit. This has four independent 28V 1A SPDT relays, each of which can be activated, deactivated or pulsed remotely through its web server. Alternatively the unit can be integrated into other computer control schemes using HTTP, XML, SNMP or Modbus/TCP protocols.

Another powerful option is to use the WebRelay-Quad Unit in peer-to-peer mode, partnered with a complementary ControByWeb product such as the WEBIN5 Five-Input Module. This has five opto-isolated digital input channels; one of these can signal a WebRelay-Quad unit at any distance to activate an output, provided both units are connected to the Web.

The status of each input can also be monitored using Modbus/TCP or XML formatted text. Each input channel can be driven by a switch, sensor or output from a PLC, automation controller or computer. The Five Input Module can also act as a pulse counter, and can generate an email message when user-defined alarm conditions are met. The ControlByWeb family extends to a wide range of analogue and digital I/O units, each with their own features, as well as web browsing and network protocol support. The WebRelay-10 has similar functionality to the WebRelay-Quad, but has 10 Form C SPDT relays each capable of switching 30 A current.

The WebRelay-10 Plus is as the WebRelay 10 plus an event scheduler with yearly calendar, customizable email alerts, logging of relay changes and other events and requests, and further configurable features. Smaller applications are served with the WebRelay-Dual and Four Channel Digital I/O units, which have two or four 5-Amp relays, and two or four optically-isolated inputs. Both include advanced full-calendar, logging and alarm email functions. Analogue input capability comes from the WEBANALOG Input Module which can handle 8 single-ended, 4 differential or a combination of 0-5 V inputs. The unit can generate emails and send ON/OFF commands to other ControlByWeb modules on alarm. Modules offering instrumentation and specialized functions are also available.

Remote boot and other remote power control applications are handled by WebSwitch PLUS which has two controlled mains outlets with worldwide power capability. The unit also features temperature monitoring, digital inputs, event scheduling, logging and email alerts. Simpler power applications can be satisfied with the WebSwitch. Both devices can be used standalone, wall mounted or with rack mounting kits.

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