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Product short description:
  • 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
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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.

Versatile inputs accommodate many applications using TTL, magnetic pickups, proximity sensors, or a variety of switches (high/low-side transistor, dry contact, open drain, open collector). Bipolar and unipolar waveforms are supported with a selectable input bias that accepts both zero and non-zero crossing signals. Voltage threshold and relative hysteresis are also user selectable.

Inputs may also function as event counters with separate microcontrollers for each channel. The module counts pulses on the positive or negative edge. It can wrap around to zero for continuous
counting, latch at a programmed count value (setpoint), or automatically reset itself to zero after reaching a setpoint value. Software controls enable remote resets. A variety of filters help
remove noise, jitter, and other mechanical effects to prevent false counts.

The discrete outputs can operate as independent alarms or provide on/off control regulated by the host system. As limit alarms, each output can be set for high and/or low setpoints exclusively tied to an analog input. These low cost modules are ideal for standalone alarms as well as for local backup of the primary control system.

Periodic or Pulse Waveform Input
Limit Alarms or Discrete Outputs

Model: 942MB: 2 input channels
Input:
Two input channels:
0 to 50KHz in three selectable ranges
Amplitudes up to 140V AC or 200V peak
Pulse counter range of 0 to 65535
Output:
Two output channels:
Solid-state relays (1A DC loads)
0 to 48V DC
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

Frequency/Counter Input

Input Ranges: Input type user-configured. Applies to both channels.

Input Range             Accuracy     Accuracy over Temp.
0 to 100Hz                   ±0.04Hz                   ±0.06Hz
0 to 1000Hz                 ±0.4Hz                      ±0.6Hz
0 to 50,000Hz             ±10Hz                       ±15Hz
0 to 65,535 pulses    ±1 pulse                   ±1 pulse

Unipolar Input Configuration: Amplitude: 0 to 3V minimum range, 0 to 200V peak maximum range.
Threshold: Configurable for 1.5V or 5V, typical.
Hysteresis: Configurable for ±25mV (at 1.5V threshold), or ±83mV (at 5.0V threshold), typical.
Bipolar (Zero-Crossing) Input Configuration:
Amplitude (0-20KHz): ±50mV minimum (with ±25mV hysteresis), or ±150mV minimum (with ±83mV hysteresis), to ±200V peak maximum.
Amplitude (Above 20KHz): ±100mV minimum (with ±25mV hysteresis), or ±200mV minimum (with ±83mV hysteresis), to ±200V peak maximum.
Threshold: 0mV nominal, 0.01V typical with ±25mV hysteresis; 0.03V typical with ±83mV hysteresis.
Hysteresis: Configurable for ±25mV or ±83mV, typical.
Resolution:
0 to 100Hz input range: 0.01Hz
0 to 1000Hz input range: 0.1Hz
0 to 50,000Hz input range: 1Hz
Pulse counter: 1 pulse
Minimum Input Pulse Width: 10μS (frequency input); 5mS (pulse input).
Counting Rate: 100Hz maximum counting rate (5mS ON and 5mS OFF for 10mS period or 100Hz).
Input Impedance: 35K ohms, typical
Input Filter Bandwidth: -3dB at 35kHz, typical
Input Pullup/Pulldown: Software selectable 2.7K ohm input pullup to +5V and a 1K ohm input pulldown to return. The resistors may also be left floating (none).
Input Debounce: 0 to 1.375 seconds, configurable in 5mS increments.
Noise Rejection: Common mode: 80dB @ 60Hz, typical with 100 ohm input unbalance.

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:

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

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

Power and Isolation

Power Requirements:
10 to 36V DC
22 to 26V 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)
  • Separate microcontrollers on each channel for pulse counting and period measurement
  • Solid-state relay outputs enable local limit alarms or host-controlled on/off switching
  • Bipolar and unipolar input signal support
  • Programmable pulse counter functions
  • Input filtering functions include hysteresis, averaging, debounce, relay time delay, and alarm deadband controls
  • 4-way isolation (input, output, power, network)
  • Watchdog timers provide a failsafe output
  • 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 (-13°F to 158°F)

Manuals

942MB 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)
    • Separate microcontrollers on each channel for pulse counting and period measurement
    • Solid-state relay outputs enable local limit alarms or host-controlled on/off switching
    • Bipolar and unipolar input signal support
    • Programmable pulse counter functions
    • Input filtering functions include hysteresis, averaging, debounce, relay time delay, and alarm deadband controls
    • 4-way isolation (input, output, power, network)
    • Watchdog timers provide a failsafe output
    • 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 (-13°F to 158°F)
  • Specs & Data Sheets

    Manuals

    942MB 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