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Low-Cost Data Acquisition Starter Kit

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DI-942MB

Frequency/Pulse Counter Modules
Periodic or Pulse Waveform Input
Limit Alarms or Discrete Outputs

  • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
  • Separate microcontrollers on each channel for pulse counting and period measurement
  • Solid-state relay outputs enable local limit alarms or host-controlled on/off switching
  • Bipolar and unipolar input signal support
  • Programmable pulse counter functions
  • Input filtering functions include hysteresis, averaging, debounce, relay time delay, and alarm deadband controls
  • 4-way isolation (input, output, power, network)
  • Watchdog timers provide a failsafe output
  • 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

942MB - Frequency/Pulse Counter Input Module with Periodic or Pulse Waveform Input

Input: 2 channels, 0 to 50KHz in 3 selectable ranges: Amplitudes up to 140V AC or 200V peak, pulse counter range of 0 to 65535.
Discrete Output: Solid-state relays (1A DC loads), 0 to 48V DC
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-942MB 2-channel frequency/counter input module. $350
Quantity:

Product Highlights

This signal conditioner is a two-channel analog input module with discrete outputs and Modbus communication. It conditions periodic or pulse waveform inputs and provides solid-state relays for limit alarms or ON/OFF control.

Versatile inputs accommodate many applications using TTL, magnetic pickups, proximity sensors, or a variety of switches (high/low-side transistor, dry contact, open drain, open collector). Bipolar and unipolar waveforms are supported with a selectable input bias that accepts both zero and non-zero crossing signals. Voltage threshold and relative hysteresis are also user selectable.

Inputs may also function as event counters with separate microcontrollers for each channel. The module counts pulses on the positive or negative edge. It can wrap around to zero for continuous counting, latch at a programmed count value (setpoint), or automatically reset itself to zero after reaching a setpoint value. Software controls enable remote resets. A variety of filters help remove noise, jitter, and other mechanical effects to prevent false counts.

The discrete outputs can operate as independent alarms or provide on/off control regulated by the host system. As limit alarms, each output can be set for high and/or low setpoints exclusively tied to an analog input. These low cost modules are ideal for standalone alarms as well as for local backup of the primary control system. See the Circuit Connection Diagrams.

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 9/22/2006. mail Webmaster