Thermocouple/MilliVolt Modbus Input Modules 924MB

These modules contain four analog input and four discrete output channels. It filters and linearises thermocouple or Millivolt inputs whilst providing isolation between, input, output, power and network circuits.

The 4 input channels accepts thermocouple types J, K, T, R, S, E, B and N or ±100mV DC Inputs.

The Acromag 924MB are Thermocouple/Millivolt Modbus RTU Input Modules.

Firstly, it contains 4 input channels, 4 alarm channels and 10 to 36V DC or 24V AC Power. Another great feature is that cold junction compensation as well as upscale/downscale sensor break detection are standard. AC and DC power sources are supported with non polarised diode coupled terminals.

Secondly, the programmable inputs enable eight thermocouple types plus wide range millivolt signals. The discrete outputs operate as alarms or on/off controllers. As limit alarms, each output can be configured with high or low set points and tied to an analog input channel. Alarms function without host communication. Otherwise on/off control is based on commands issued from host system.

Finally, these modules are used in both control room and distributed field I/O applications.

Features of the Thermocouple/MilliVolt Modbus RTU Input Modules 924MB include:

  • 16-bit sigma-delta A/D yields 0.1°C resolution and 0.5°C measurement accuracy Thermocouple linearisation 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 fail-safe 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
  • Operating temperature: -25°C to 70°C


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