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Modbus RTU Communication

Acromag's BusWorks 900MB Series is a high-performance collection of analog and discrete I/O modules and relay alarm outputs. Industrial Modbus RTU (Remote Terminal Unit) serial transmission mode.  These units feature universal input/output ranges and an intelligent microcontroller to provide extreme flexibility and powerful monitoring and control capabilities. These Modbus RTU modules are ideal for a wide variety of distributed I/O applications including data acquisition, control, process monitoring, and test & measurement.

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    901MB, 902MB, 903MB: Multi-Channel Modbus-RTU Discrete I/O Modules

    • Active-Low Inputs, Sinking Outputs (Low-Side Switching)
    • 12 input and/or 12 output channels
    • 0 to 35V DC I/O range
    • 10 to 36V DC, 24V AC power
    • Modbus-RTU high-speed RS-485
    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.    
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    904MB, 905MB, 906MB: Multi-Channel Discrete I/O Modules

    • Active-High Inputs, Sourcing Outputs (High-Side Switching)
    • 12 input and/or 12 output channels
    • 0 to 35V DC I/O range
    • 10 to 36V DC, 24V AC power
    • Modbus-RTU high-speed RS-485
    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.
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    913MB, 914MB: DC Current/Voltage Modbus-RTU Input Module with Limit Alarms

    • 4 input channels
    • 0 to 20mA DC (0 to 20A AC with AC sensor) or ±10V DC input range
    • 4 alarm channels, open drain MOSFETS (1A DC loads, 0 to 35V DC)
    • 10 to 36V DC, 24V AC power
    • Modbus RTU high-speed RS-485
    This signal conditioner is a four-channel analog input module with four discrete outputs. It provides isolation between input, output, power, and network circuits.
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    917MB, 918MB: DC Current/Voltage Modbus-RTU Output Modules with Discrete Outputs

    • 4 analog output channels
    • 0 to 20mA or 0 to 10V DC output range
    • 4 discrete output channels, open drain MOSFETS (1A DC loads, 0 to 35V DC)
    • 10 to 36V DC, 24V AC power
    • Modbus RTU high-speed RS-485
    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.
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    924MB: Thermocouple/milliVolt Modbus-RTU Input Module with Limit Alarms

    • 4 input channels, thermocouple (types J, K, T, R, S, E, B, N) or millivolt (±100mV DC) input
    • 4 alarm channels, open drain MOSFETS (1A DC loads, 0 to 35V DC)
    • 10 to 36V DC, 24V AC power
    • Modbus-RTU high-speed RS-485
    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.  
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    932MB, 934MB: RTD/Resistance Modbus-RTU Input Modules with Limit Alarms or Discrete Outputs

    • 2 or 4 input channels, RTD (100 ohm Pt, 120 ohm Ni, 10 ohm Cu) or resistance (0 to 500 ohms) input
    • Solid-state relays discrete output, Form A, SPST-NO
    • 10 to 36V DC, 24V AC power
    • Modbus-RTU high-speed RS-485
    This signal conditioner is a dual or quad-channel analog input module with one discrete/relay output per input channel and a Modbus interface. It filters and linearizes RTD or resistance inputs while providing isolation between input, output, power, and network circuits.
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    942MB: Frequency/Pulse Counter Modbus-RTU Input Modules with Periodic or Pulse Waveform Input

    • 2 input channels, 0 to 50KHz in 3 selectable ranges: Amplitudes up to 140V AC peak, Amplitudes up to 200V peak, Pulse counter range of 0 to 65535
    • Solid-state discrete output relays (1A DC loads), 0 to 48V DC
    • 10 to 36V DC, 24V AC power
    • Modbus-RTU high-speed RS-485
    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.
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    4683 Series: RS485-to-RS485 Network Repeater

    • Designed for use with Johnson Controls N2 or BACnet MS/TP bus
    • 115V AC ±10%, 50/60 Hz, 0.05A or 230V AC ±10%, 50/60 Hz, 0.03A or 24V AC ±10%, 50/60 Hz, 0.18A typical power
    • Operating temperature: -25 to 70° C (-13 to 158° F)
    4683-TTM-1F: 115V AC Power 4683-TTM-2F: 230V AC Power 4683-TTM-3F: 24V AC Power
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Modbus BusWorks 900MB - Continued

Green Separator Line

Modbus devices communicate using a master-slave technique in which only one device (the master) can initiate transactions (called queries). The other devices (slaves) respond by supplying the requested data to the master, or by taking the action requested in the query. A slave is any peripheral device (I/O transducer, valve, network drive, or other measuring device) which processes information and sends its output to the master using Modbus. Acromag Series 900MB I/O Modules are slave devices, while a typical master device is a host computer running appropriate application software.