New RTD input modules interface sensors to a Profibus network for about half the cost of modular I/O systems

This new addition to Acromag’s BusWorks^® 900PB Series directly interfaces RTD temperature sensors to a Profibus-DP network without expensive bus-couplers or special I/O racks.

Acromag’s new BusWorks^® 966PB Input Modules interface up to six RTD or resistance signals directly to a Profibus-DP network. These independent input devices do not require expensive additions, such as bus-couplers and mounting racks like modular or block I/O systems, to deliver a more compact and cost-effective solution. Each inch-wide module contains a 16-bit A/D converter, a microcontroller for intelligent signal processing, and an SPC3 ASIC to communicate with the Profibus network. Priced at only $500 for a four-input unit or $650 for six inputs, they are very economical for applications that need to monitor a small quantity of RTD sensors per site. Power requirements are very flexible. The 966PB uses standard 12-36V DC supplies instead of proprietary power packs.

Each unit accepts universal RTD/resistance inputs with user selectable ranges for platinum, nickel, or copper RTD sensors and 0-500 ohm signals. The 16-bit sigma-delta A/D converters deliver highly accurate measurements. A built-in RTD sensor break detection feature senses wiring failures and invokes upscale or downscale failsafe output. Three-way 1500V AC isolation between the input, network and power circuits protects against surges and ground loops.

The isolated ProfiBus-DP network interface is highly immune to noise and operates dependably over long distances. 966PB units automatically detect the network baud rate and support high-speed communication rates of up to 12M baud. Network addresses are easily set via switches on the modules. A built-in watchdog timer monitors for network communication problems while self-diagnostic capabilities simplify maintenance and troubleshooting. A failsafe mode can be set to ensure outputs are sent to a safe state if a failure occurs.

Many other features ensure dependable operation. All of Acromag’s 900PB series modules employ the industry-standard Siemens SPC3 intelligent ASIC to handle ProfiBus protocol and communicate with the network. An internal microcontroller has integrated non-volatile memory for reliable storage of configuration parameters and can be reprogrammed repeatedly. And to visually confirm proper operation, LEDs indicate power, network activity, and individual channel status. The units are pending certification by the ProfiBus PNO, as well as CE approvals and UL/cUL listings.

Acromag, a multimillion dollar international corporation, has been developing and manufacturing measurement and control products for more than 45 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

BusWorks is a registered trademark of Acromag, Inc.  All other trademarks are the property of their respective owners

Data Sheet (pdf 131KB)

February 12, 2003

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