Bullet Sensors & Transducers e-Digest, Vol. 86, Issue 12, December 2007: Product News

    (ISSN 1726- 5479)


Editorial Calendar 2007

Editorial Board

Submit an Article or Press Release

10 Top Sensors Products of 2007

Sensors & Transducers Journal 2006

Acromag logo

Top 25 Downloaded Article

2000-2002 S&T e-Digest Contents

2003 S&T e-Digest Contents

2004 S&T e-Digest Contents

2005 S&T e-Digest Contents



New Inch-Wide Ethernet I/O Modules Interface 16 Discrete I/O and Perform Counter/Timer Functions


Wixom, MI: Acromag has extended their BusWorks® line of high-density Ethernet I/O modules for distributed I/O and SCADA with new Model 989EN isolated discrete I/O that also performs counter/timer functions. These space-saving inch-wide modules provide an isolated Ethernet Modbus TCI/IP interface for any input/output mix of up to 16 discrete signals. Inputs sense the status of dry contacts, switches, power supplies, or DC logic. Industrial-grade units have eight 32-bit pulse counters with timers, alarms, and non-volatile memory for metering, totalizing, and low-frequency periodic measurement functions. Outputs control solid-state switching of lamps, horns, and other devices. Prices start at $195.


Common applications involve monitoring of temperature, pressure, flow, level and discrete sensor switches in process control applications. Outputs are ideal for switching valves, actuators, pumps, and motors as well as for audible or visual alarms. Counter/timer functions are useful for proximity, RFID, or speed measurement and for totaling pulses in utility meter and predictive maintenance cycle applications.


Commercial and industrial-grade models have 16 individually configurable bi-directional I/O channels with a 0-28V DC signal range. When configured as inputs, channels accept 2- or 3-wire sensors and active logic switches for use with dry contacts, proximity, namur, or 5-28V DC logic. Inputs detect a level or change of state. Outputs switch 0.5A/channel or 2A total. A “loopback” feature reads back the output state on an input channel. Industrial models add eight counter/timers that can be configured as 32-bit up/down pulse or event counters with non-volatile memory or as 16-bit periodic timers. Each counter supports momentary or latching alarms. The counters have a 250 Hz maximum frequency and the timers have resolution to one millisecond. A programmable debounce setting filters out relay chatter.


These units are very easy to use. No software is required as the units are configured using any web browser to setup embedded configuration menus. An auto-copy function lets users rapidly apply a saved configuration to multiple units. Automatic MDI/MDI-X negotiation simplifies installation.


BusWorks 989EN units are also designed for high-reliability operation. Units feature 1500Vrms isolation with surge protection to increase performance and prevent damage from high-voltage transient signals. The isolation separates power, I/O, and network circuits. To further ensure dependable operation, the I/O circuitry includes over-temperature, over-voltage, and over-current protection. Industrial-grade models operate reliably across a wide ‑40 to 65°C temperature range. Power-up conditions are programmable and watchdog timer output is configurable for failsafe or hold-last-value operation in the event of a network failure. Units perform self-test diagnostics and provide front-panel LEDS for visible verification of operation. CE, UL and ATEX approvals (Zone 2, Class I, Division 2, Group ABCD locations) are pending.

989EN Ethernet I/O module





Karen Haldenwanger

Acromag, Inc.

Tel.: (248)-295-0866

Fax: (248) 624-9234

P.O. Box 437, Wixom, MI 48393-7037 USA

E-mail: khaldenwanger@acromag.com

Sensors Web Portal's logo




 GlobalSpec banner



Back to S&T e-Digest page


1999 - 2007 Copyright ©, International Frequency Sensor Association (IFSA). All Rights Reserved.