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Product of the Month  New Ethernet DC input modules are ideal for remote I/O functions at distributed sites with low point countsThis addition to Acromag’s BusWorks® Series directly interfaces differential voltage or current signals from remote sites to a Modbus/TCP network without expensive investments for intelligent controllers. Acromag’s new BusWorks® 961EN and 962EN Input Modules interface six differential DC voltage or DC current signals directly to an Ethernet Modbus/TCP 10/100 network. These independent I/O devices do not require expensive companion products, such as the intelligent controllers and backplanes required for PLCs or modular I/O systems, to deliver a more compact and cost-effective solution with very low startup costs. Setup is also faster and easier with embedded web pages allowing configuration using any standard web browser. No other software is required. Priced at only $500 for a six-input unit, they are very economical for applications that need to monitor a small quantity of sensors or devices per site. Each module is only an inch wide with the highest density footprint available for compact mounting on DIN-rails. Power requirements are also very flexible, supporting standard 15-36V DC power sources instead of proprietary 5V supplies. The 961EN unit accepts 0-1mA, 0-20mA, or 4-20mA signals. It can also measure 0-20A AC using the optional external AC current sensor. The 962EN model has eight user-selectable input range options to take in bipolar signals from ±78mV to ±10V DC. Differential inputs, compared to single-ended inputs, are less susceptible to noise errors and offer greater flexibility for placement of the I/O modules anywhere in the control loop. Three-way 1500V AC isolation between the input, network and power circuits protects against surges and ground loops. For more information download Acromag's Ethernet I/O brochure (pdf, 918 KB). Visit www.acromag.com for more information or call 248-624-1541. To request product literature or our 2003 catalog, click here. Other News Ask the I/O Experts Answer: Acromag offers two basic 4-20mA alarms that can solve the continuous level overfill application. The first, and most direct, approach is to use a loop-powered alarm, This type of 4-20 mA alarm is powered by the existing wires and offers one SPDT relay output. It's installed in series and can be placed anywhere in the loop. The unit is inherently isolated and failsafe (relay is de-energized in alarm condition and loss of mA signal). Because of its design, the device does not require any additional power wiring and will only add a 225 ohm load to the existing loop. more information
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