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DI-917MB and DI-918MB

Multi-Channel Analog Output Modules
DC Current or DC Voltage Outputs
Discrete Outputs

• Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
• 12-bit D/A yields 0.1% of span resolution and accuracy
• Four outputs in a single inch-wide module reduces system costs and saves panel space
• Four discrete outputs enable host-controlled on/off switching
• Heavy-duty 1A solid-state relays provide dependable on/off control of industrial devices
• Self-calibration lowers maintenance costs by reducing periodic manual calibration checks
• 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, output and network circuitry
• Self-diagnostics monitor microcontroller activity to detect operational failures (lock-up) and execute a reset to restore communication.

Specifications

917MB - DC Current Output Module with Discrete Outputs
Analog Output: 4 channels, 0 to 20mA output range
Discrete Output: 4 channels, open drain MOSFETS (1A DC loads, 0 to 35V DC)
Power: 10 to 36V DC, 24V AC
Network Communication: Modbus RTU high-speed RS-485

918MB - DC Voltage Output Module with Discrete Outputs
Analog Output: 4 channels, 0 to 10V DC output range
Discrete Output: 4 channels, open drain MOSFETS (1A DC loads, 0 to 35V DC)
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).

Product Highlights

These modules drive four analog output channels and also feature four discrete outputs for on/off control. Isolation separates the output, power, and network circuits. Network communication adheres to the industry-standard RS-485 Modbus RTU protocol. AC and DC power sources are supported with nonpolarized, diode-coupled terminals.

The analog outputs generate a signal based on communication from the host. They accommodate wide DC voltage or current ranges. Discrete outputs provide simple on/off switching capability for external devices. See the Circuit Connection Diagrams.

Combining analog outputs, on/off controllers, 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 make it reliable for both control room and distributed field I/O use in a broad range of temperature control 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.

© 2008 DATAQ Instruments, Inc. All rights reserved. Date last edited 7/26/2006. Contact the Webmaster

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