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, non-polarized, 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 904, 905, and 906 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. 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).

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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
    $300$325
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    904MB, 905MB, 906MB: Multi-Channel Modbus-RTU 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. Both AC and DC power sources are supported with wide range, nonpolarized, diode-coupled terminals.
    $300$325
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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
    $385
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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
     
    $385
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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
    $435
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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. Lead wire compensation and upscale/downscale sensor break detection are standard. Low voltage AC and DC power sources are supported with non-polarized, diode-coupled terminals.
    $320$435
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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
    $385
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    994EN: Ethernet Analog Input Module

    • 16-channel single-ended analog voltage input
    • Modbus TCP/IP communication
    These modules interface high-level analog input signals to an Ethernet control network. A high-performance design ensures reliable measurements and dependable operation.
    $580$835
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