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Product short description:
  • 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
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This signal conditioner is a four-channel analog input module with four discrete outputs. It provides isolation between input, output, power, and network circuits. Network communication adheres to the industry-standard RS-485 Modbus RTU protocol. AC and DC power sources are supported with non-polarized, diode-coupled terminals.

The inputs accommodate wide DC voltage or current ranges. 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).

DC Current, DC Voltage or AC Current Input
Limit Alarms or Discrete Outputs

Models:
913MB: 4 current input channels
914MB: 4 voltage input channels
Input Ranges:
0 to 20mA DC
±10V DC
0 to 20A AC (with 5020-350 sensor)
Output:
Four output channels:
Open-drain MOSFETs (1A DC loads)
0 to 35V 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

General Input

Resolution: 0.005% or 1 part in 20,000
Noise Rejection:
Normal mode: 40dB @ 60Hz, typical
Common mode: 140dB @ 60Hz, typical
Input Filter Bandwidth: -3dB at 3Hz, typical
Input Conversion Rate: 180ms per channel

Current Input (913MB)

DC Current Input Ranges: Range user-configured. Range selected applies to all channels.
0 to 1mA, 0 to 20mA, 4 to 20mA
0 to 11.17mA (for use with 5020-350 AC sensor)
DC Current Input Resistance: 49.9 ohms
DC Current Input Accuracy: ±0.1% of input range

Voltage Input (914MB)

DC Voltage Input Ranges: Range user-configured. Range selected applies to all channels.
±10V, ±5V, ±2.5V, ±1.25V,
±625mV, ±313mV, ±156mV, ±78mV
Input Impedance: 110.5K ohms
DC Voltage Input Accuracy: ±0.1% of input range

Discrete Output

Output Type: Four independent open drain MOSFET switches with a common return that operate as low-side switches.
Output Voltage Range: 0 to 35V DC. External voltage source required.
Output Current Range: 0 to 1A DC continuous for each output
Output OFF Leakage Current: 50μA maximum
Output ON Resistance: 0.15 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 optionally be set to user-defined states following a watchdog timeout. Watchdog timeout output control takes precedence over limit alarm control. Alarm control takes precedence over host control.

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

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

Power and Isolation

Power Requirements: 10 to 36V DC or 22 to 26V AC

Supply Current:

Supply      Current Draw
10V DC     125mA maximum
24V DC      50mA maximum
24V AC    100mA rms maximum

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 ±4V DC.

 

  • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
  • 16-bit sigma-delta A/D yields 0.1% of range resolution and accuracy
  • Four inputs in a single inch-wide module reduces system costs and saves panel space
  • Four discrete outputs enable local 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 micro-controller 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

913MB, 914MB 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% of range resolution and accuracy
    • Four inputs in a single inch-wide module reduces system costs and saves panel space
    • Four discrete outputs enable local 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 micro-controller 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

    913MB, 914MB User Manual (Log in to download the file)

  • Software

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

    • Compare

      20RM-16-DIN: 19” rack-mount kit with DIN rail

      • 19" rack-mount kit with DIN rail
      $175
      Select options
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      5020-350: Toroidal AC Current Sensor

      • AC Current Sensor to precondition an AC current input signal
      • Highly accurate toroidal instrument transformer that converts an AC current signal to a safe, low level, DC milliampere signal (0 to 11.17mA).
      $45
      Select options
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      5035 Series: Ethernet Cables

      • Ethernet straight cable, CAT5
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      • Low EMI Double-Shielded Ethernet Patch Cable
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      Read more
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      • Configuration Software
      • USB-to-RS232 Adapter
      • RS232-to-RS485 Adapter
      • Interface Cable
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      Read more
    • Compare

      AMTN, AMTX: ActiveX / .NET Controls for Modbus I/O

      $330
      Select options
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      PS5R: Slim Line Power Supplies

      • 10W, 15W, 30W, 60W, 90W, 120W, and 240W models
      • Universal Input (85-264V AC / 100-370V DC)
      • Lightweight and compact size
      $95$245
      Select options
    • Compare

      Terminal Block Replacements

      • Simplifies wiring connections on Acromag I/O Modules
      • Barrier strip or spring clamp terminal block kits
      • Provide safe and secure wiring connections
      $25$35
      Select options
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      USB Cables

      Various USB cables
      $10$15
      Select options
  • 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