Bullet Sensors & Transducers e-Digest, Vol. 59, Issue 9, September 2005: Product News

    (ISSN 1726- 5479)


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New Ethernet I/O Module with a Mix of Analog Inputs, Analog Outputs and Discrete I/O Channels


Wixom, MI - Acromag released their new 951EN and 952EN “Combo” Ethernet I/O modules with four analog input channels, two analog output channels, and six discrete input/output channels on a single inch-wide unit. This mix of I/O can reduce costs significantly by replacing the need to buy three different I/O modules. The modules support Ethernet/IP and Modbus TCP/IP protocols as well as Acromag’s own i2o™ communication technology. The i2o (input-to-output) function allows input channels on one module to send measured signal data directly to output channels on a remote module across any Ethernet media without a PLC, PC or other controller in between. Since the Combo modules have inputs and outputs, they can function as both transmitters and receivers to independently interface signals across the plant or around the globe. No software is required because the setup uses a standard Internet browser to configure an embedded web page.


The six discrete I/O channels can be implemented as inputs or outputs in any combination and feature built-in “loop back” monitoring abilities. Each channel has circuitry for both sensing and high-side switching of discrete logic signals (5-36V DC logic). With this design strategy, all channels remain inputs unless they are written to, in which case, that channel becomes a sourcing output. Thus, when a discrete output channel switches on or off, users can read it back thru a discrete input register tied to the same channel for positive feedback. No extra wiring or looping back to another physical channel to verify the integrity of their outputs is required.


The four analog input channels on 951EN models accept 0-20mA, 4-20mA, and 0-1mA DC signal ranges while the 952EN models take in bipolar voltage ranges of ±10V, ±5V, and ±1V DC and transmit the data across the network. The analog output channels receive the data and provide 0-20mA, 4-20mA, or 0-1mA DC control signals for displays, drives, recorders, or other instruments.


Each I/O module has its own Ethernet Modbus TPC/IP port making it easy to connect the modules to each other with up to 100 meters of CAT5 cable. For longer distances or to reduce wiring, the I/O modules connect to a switch or radio modem to tap into copper, fiber, or wireless networks. Using a standard web browser, a simple configuration menu maps each input channel to an IP address and register for the output module. This process eliminates the need for a controller to poll the input module and transmit the data to the output module. Updates are user-defined for time-based or change-of-state.

Ethernet I/O module





Robert Greenfield, 

Marketing Communication. Manager,

Acromag, Inc.

30765 S Wixom Rd, PO Box 437, 

Wixom, MI 48393-7037 USA

Tel: 248-624-1541 

Fax: 248-624-9234

E-mail: rgreenfield@acromag.com



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