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DI-924MB

Multi-Channel Temperature Control Modules
Thermocouple or Millivolt Input
Limit Alarms or Discrete Outputs

• Standard Modbus-RTU protocol with high-speed RS-485 communication (up to 115K bps)
• 16-bit sigma-delta A/D yields 0.1°C resolution and 0.5°C measurement accuracy
• Thermocouple linearization and sensor break detection ensure reliable measurements
• Four discrete outputs enable local temperature limit alarms or 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
• Four-way isolation eliminates potential ground loops between power, input, output and network circuitry
• Self-diagnostics monitor microcontroller activity to detect operational failures (lock-up) and execute a reset to restore communication.

Specifications

924MB - Thermocouple/Millivolt Input Module with Limit Alarms
Input: 4 channels, thermocouple (types J, K, T, R, S, E, B, N) or millivolt (±100mV DC) input
Alarms: 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

This signal conditioner is a four-channel analog input module with four discrete outputs. It filters and linearizes thermocouple inputs while providing isolation between input, output, power, and network circuits. Cold junction compensation and upscale/downscale sensor break detection are standard. AC and DC power sources are supported with nonpolarized, diode-coupled terminals.

The programmable inputs accommodate eight thermocouple types plus wide-range millivolt signals. Flexible discrete outputs operate as alarms or on/off controllers. As limit alarms, each discrete output can be configured with high and/or low setpoints exclusively tied to an analog input channel. Alarm trips function without host communication enabling low-cost stand-alone alarms as well as local backup for the primary control system. Otherwise, on/off control is based on commands issued by the host system.? See the Circuit Connection Diagrams.

Combining flexible transmitter functions, mixed signal I/O, alarm support, 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.

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

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