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DI-901MB/DI-902MB/DI-903MB

Multi-Channel Discrete I/O Modules
Active-Low Inputs Sinking Outputs (Low-Side Switching)

  • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
  • Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
  • High-voltage, high-current, open-drain outputs enable direct (low-side) control of external devices
  • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
  • Tandem input/output circuitry (DI-903MB models only) connects input buffers with open-drain outputs for convenient loopback monitoring of the output state
  • Outputs have built-in over-temperature and over-current shut-down protection, plus active clamping circuits for switching inductive loads
  • Watchdog timers provide a configurable failsafe output state for use when host I/O communication is lost
  • Three-way isolation eliminates potential ground loops between power, I/O, and network circuitry
  • Self-diagnostics monitor microcontroller activity to detect operational failures (lock-up) and execute a reset to restore communication.

For more complete specifications, download the Data Sheet (left) or the Manual (right).

      Distributed Data Acquisition Datasheet          Distributed Data Acquisition Manual

DI-900 Modbus Distributed Data Acquisition

Specifications

901MB - Discrete Input Module
(Active-Low)

Input: 12 channels, 0 to 35V DC range
Power: 10 to 36V DC, 24V AC
Network Communication: Modbus-RTU high-speed RS-485

902MB - Discrete Output Module
(Low-Side Switching)

Output: 12 channels, 0 to 35V DC range, sinks current
Power: 10 to 36V DC, 24V AC
Network Communication: Modbus-RTU high-speed RS-485

903MB - Discrete I/O Module
(Active-Low Inputs, Low-Side Switches)

Input: 12 channels, 0 to 35V DC range
Output: 12 channels, 0 to 35V DC range, sinks current
Power: 10 to 36V DC, 24V AC
Network Communication: Modbus-RTU high-speed RS-485
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Note: Pricing outside the U.S. will be higher to account for shipping, taxes, duty, currency fluctuation, local warranty and technical support in your country.
DI-900MB modules have typical lead times of 1-2 weeks.
Part Number Description Price
(US)		 DATAQ Store
DI-901MB 12-channel discrete input module. $275
Quantity:
DI-902MB 12-channel discrete output module. $275
Quantity:
DI-903MB 12-channel discrete input/output module. $300
Quantity:

Product Highlights

These modules provide twelve discrete input and/or output channels. Isolation separates the I/O, power, and network circuits. Network communication adheres to the industry-standard RS-485 Modbus RTU protocol. Both AC and DC power sources are supported with wide range, nonpolarized, diode-coupled terminals.

The open-drain outputs are intended for current-sinking or low-side switching applications. The buffered inputs are active-low. These models are the complement of the DI-904MB, DI-905MB, and DI-906MB units which have open-source, high-side output switches and active-high inputs. Socketed pull-up resistors are easily removed or exchanged to satisfy your application requirements.  See the Circuit Connection Diagrams.

Combining flexible I/O types, wide I/O ranges, and a network interface in a single package, makes this instrument extremely powerful. Multi-channel design adds cost-efficiency and allows high-density mounting. Plus, safe, rugged construction makes these modules reliable for use in both control room and distributed field I/O applications. Custom module configurations are also possible (consult factory for details).

Everything you need to complete your network is available from DATAQ Instruments, Inc. - isolators, signal converters, signal boosters, power sources, and mounting hardware.  Check out the Accessories.

         
 

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© 2008 DATAQ Instruments, Inc. All rights reserved. Date last edited 9/28/2006. mail Webmaster