New Multi-Channel Analog and Discrete I/O Modules Simplify Low-Cost Distributed I/O on Modbus Networks 

Acromag introduces their BusWorks™ 900MB Series with a high-speed Modbus RTU interface compatible with popular HMI software for high-density, low-cost distributed I/O applications

Acromag’s new BusWorks™ 900MB Series Analog and Discrete I/O Modules feature a high-speed Modbus-RTU network interface. The multi-channel I/O modules are more cost and space-efficient delivering a much lower cost per channel and enabling high-density DIN-rail mounting. Analog input and analog output modules provide four independent channels for signal conditioning and process control applications. The twelve-channel discrete I/O modules are ideal for on/off monitoring and control of industrial devices. High-speed RS-485 communication allows data transfers up to 115K baud. Windows^® configuration software simplifies selection of input/output ranges, limit alarms, and other operating parameters for quick setup of the I/O modules. Prices for 4-channel analog I/O modules start at $325 and 12-channel discrete I/O modules begin at $275.

Analog input modules monitor DC current, voltage, millivolt or thermocouple sensor inputs and provide alarm outputs if conditions exceed user-defined limits. Each module has four analog input channels and four discrete outputs for independent local alarms or host-controlled on/off switching.

Analog output modules are ideal for controlling a wide variety of industrial machinery. The host defines the output of DC voltage or current signals to control speed, flow, temperature, frequency, level, force, torque, intensity, and many other properties. Each module has four analog output channels plus four discrete outputs for on/off switching applications.

Discrete I/O modules monitor or control the on/off status of various devices. Input modules transmit discrete level data to other network devices or controllers while output modules can activate local alarms. Models are available with twelve inputs, twelve outputs, or twelve tandem I/O channels.

To ensure unsurpassed performance, 900MB I/O modules employ the latest digital technology. State-of-the-art flash microcontrollers plus optically isolated input, output, power, and network circuits increase noise/transient immunity and prevent ground loops. Status LED's provide diagnostic feedback and visually indicate which channels are outside their calibrated range.

Sophisticated watchdog timer functions allow the application to define the module's failsafe output state. The watchdog timer invokes the failsafe condition when communication between the host and module exceed a duration specified by the application. For further security, a second hardware watchdog timer monitors the microcontroller for failed operations or a "lock-up" condition and automatically resets the unit.

Series 900 I/O modules are compatible with popular Human-Machine Interface (HMI) software packages that support Modbus communication. The I/O modules may be configured using generic drivers provided with the HMI software to access the Modbus register maps.

A full compliment of accessories to complete the system include both isolated and non-isolated RS-232-to RS-485 signal converters for PC-to-network communication. Network repeaters extend the communication distance another 4000 feet and allow connection of an additional 32 network devices. Power supplies, mounting hardware, and surge suppressors are also available.

Acromag, a multimillion dollar international corporation, has been manufacturing and developing measurement and control products for more than 40 years. They offer a complete line of industrial I/O products including process instruments, signal conditioning equipment, data acquisition boards, distributed I/O systems, and communication devices.

For more information about Acromag products, call the Inside Sales Department or Marketing Communications at (248) 624-1541, (800) 881-0268, FAX (248) 624-9234, or write Acromag, Inc. at P.O. Box 437, Wixom, MI 48393-7037 USA. Information is also available on the Acromag web site at http://www.acromag.com.com.

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More information

April 16, 2001

Contact:
Sales - Inside Sales
(e-mail: sales@acromag.com)
Editorial-Robert Greenfield, Marketing Communications Manager
(e-mail: rgreenfield@acromag.com)