DATAQ Instruments, Inc.

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.

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

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

Description	Store
DI-901MB 12-channel discrete input module.	Price: $275 US Quantity:
DI-902MB 12-channel discrete output module.	Price: $275 US Quantity:
DI-903MB 12-channel discrete input/output module.	Price: $300 US Quantity:
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.

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.

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

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

Specifications

Product Highlights

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