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Product short description:
  • 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
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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.

The programmable inputs accommodate four RTD types plus wide-range resistance 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 set-points 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.

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).

RTD or Resistance Input
Limit Alarms or Discrete Outputs

Models:
932MB: 2 input channels, 2 relay outputs
934MB: 4 input channels, 4 relay outputs
Input:
RTD (100 ohm Pt, 120 ohm Ni, 10 ohm Cu),
Resistance (0 to 500 ohms)
Output: Solid-state relays, Form A, SPST-NO
Network Communication: Modbus-RTU high-speed RS-485
Power Requirement:
10 to 36V DC
24V AC
Approvals:
CE marked. UL, cUL listed
Class I; Division 2; Groups A, B, C, D

Performance Specifications

RTD/Resistance Input

Input Ranges: Input type user-configured. Type selected applies to all channels. RTD linearization, lead wire compensation, and open circuit or lead break detection are included.
Input Type       Alpha        Input Range     Accuracy
Pt 100 ohm       1.3850     -200 to 850°C        ±0.25°C
Pt 100 ohm       1.3911     -200 to 850°C        ±0.25°C
Ni 120 ohm       1.6720       -80 to 320°C        ±0.25°C
Cu 10 ohm        1.4272     -200 to 260°C        ±1.00°C
Resistance         Linear      0 to 500 ohms     ±0.05 ohm

Resolution:
Input Type       Alpha      Resolution
Pt 100 ohm      1.3850          0.1°C
Pt 100 ohm      1.3911          0.1°C
Ni 120 ohm      1.6720          0.1°C
Cu 10 ohm       1.4272          0.2°C
Resistance       Linear      7.8125 milliohms

Ambient Temperature Effect: Better than ±0.005% of input span per °C, or ±1.0uV/°C, whichever is greater.
Noise Rejection:
Normal mode: 40dB @ 60Hz, typical
Common mode: 130dB @ 60Hz, typical
Input Filter Bandwidth: -3dB at 3Hz, typical
Input Conversion Rate: 300ms per channel typical
RTD Break Detection: Sensor failure can be configured for either upscale or downscale. Selection applies to all channels.
Excitation Current: 1mA DC typical, all types
Lead-Wire Compensation: Inherent for 3-wire RTD. The maximum lead resistance is 25 ohms per lead (Pt), 20 ohms per lead (Ni), 10 ohms per lead (Cu). All lead wires must be of equal
size and length.

Discrete Output

Output Type: Solid-State Relay (SSR), one Form A (SPST-NO) switch per input channel. Outputs share a common return connection at the RTN terminals for low side switching.
Output Voltage Range: 0 to 48V DC, 1A DC
Output ON Resistance: 0.4 ohms maximum
Output Response Time: 4.1ms typical, from receipt of command to gate transition of the output MOSFET.
Operation: Digital outputs are set to their OFF state following a software or power-on reset. Outputs can be set to user-defined states following a watchdog timeout.

Communication

Supported Modbus Commands: The command/response protocol for communicating with this module adheres to the Modbus/RTU standard for the following Modbus functions:

  • Force Multiple Coils
  • Force Single Coil
  • Preset Multiple Register
  • Preset Single Register
  • Read Coil
  • Read Holding Registers
  • Read Input Registers
  • Reset Slave
  • Report Slave ID

LED Indicators: LEDs indicate power, status, and discrete level/alarm

Power and Isolation

Power Requirements:
10 to 36V DC (56mA max. at 24V DC)
22 to 26V AC (94mA rms max. at 24V AC)
Isolation:
1500V AC for 60 seconds or 250V AC continuous.
4-way isolation between input, network, power and discrete I/O circuits. Inputs are isolated channel-to channel for common mode voltage to ±5V DC.

 

 

  • 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 0.25°C accuracy (Pt, Ni RTDs)
  • RTD linearization and sensor break detection ensure reliable measurements
  • Discrete relay 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

Manuals

932MB, 934MB User Manual (Log in to download the file)

BusWorks 900MB Modbus RTU Configuration Software (Log in to download the file)
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Additional information

Weight 16 oz
Dimensions 12 × 13 × 3 in
Part Number

4001-112: ,Type A to Type B, 4001-113: Type A to Mini-B, 5028-565: Micro USB to USB OTG, 4001-095: USB-to-DB9

  • Description

  • Features & Benefits

    • 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 0.25°C accuracy (Pt, Ni RTDs)
    • RTD linearization and sensor break detection ensure reliable measurements
    • Discrete relay outputs enable local temperature limit alarms or host-controlled on/off switching
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    • 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
  • Specs & Data Sheets

    Manuals

    932MB, 934MB User Manual (Log in to download the file)

  • Software

    BusWorks 900MB Modbus RTU Configuration Software (Log in to download the file)
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  • Additional information

    Additional information

    Weight 16 oz
    Dimensions 12 × 13 × 3 in
    Part Number

    4001-112: ,Type A to Type B, 4001-113: Type A to Mini-B, 5028-565: Micro USB to USB OTG, 4001-095: USB-to-DB9