Click to zoom
$315$345
Clear
Product short description:
  • 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.

 

[DISPLAY_ULTIMATE_PLUS]

904MB, 905MB, 906MB: Multi-Channel Discrete I/O Modules Description

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 outputs are intended for current-sourcing or high-side switching applications. The buffered inputs are active-high. These models are the complement of the 901, 902, and 903 units which have low-side output switches and active-low inputs. Socketed pull-down resistors are easily removed or exchanged to satisfy your application requirements.

The 906MB model has twelve input/output points that may be used as inputs or outputs on a bit-by-bit basis. Outputs may be read back to verify output settings.

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).

Active-High Inputs Sourcing Outputs (High-Side Switching)

Models:
904MB: 12 input channels
905MB: 12 output channels
906MB: 12 input/output channels
Input:
Twelve input channels (904, 906 models only)
0 to 35V DC
Output:
Twelve output channels (905, 906 models only)
6 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

Discrete Inputs (904 & 906 models only)

Input Type: 12 active-high, buffered inputs, with a common connection. Inputs include transient suppression devices and series connected 100K ohm resistors, plus diode over-voltage clamps to the internal +5V supply.
Input Signal Voltage Range: 0 to 35V DC, maximum
Input Current: 293μA, typical at 35V DC
Input Signal Threshold: 
TTL compatible with 100mV of hysteresis, typical
Thus, Low-to-High threshold is 1.5VDC
High-to-Low is 1.4VDC, typical
Limited to TTL levels of 0.8VDC (max. LOW level) and 2.0VDC (min. HIGH level)
Input Resistance:
5.6K ohms with standard factory pull-down resistors installed
100K ohms without pull-downs
Input Hysteresis: 100mV DC, typical
Input Response Time:
500ns for low-to-high, 2μS for high-to-low, typical
Micro controller samples inputs as a group every 10mS

Discrete Outputs (905 & 906 models only)

Output Type: 12 independent, open-source, MOSFET switches that operate as high-side switches.
Output Voltage Range:
6 to 35V DC (0 to 250mA/channel continuous)
External excitation voltage required
Output ON Resistance: 0.15 ohms maximum
Output Response Time:
Outputs update within 50ms of a write command and switch within 5mS of receipt of command.
Loopback response (906MB) is 1μS low-to high, 5μS high-to-low.

General

I/O Pull-downs and Socket: 5.6K ohm pull-down resistor SIPs are installed in sockets at each port (four-channels per port).
Excitation (per port): External excitation voltage for each four-channel port is limited to 35V or less.
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 Input Status
  • Read Holding Registers
  • Read Input Registers
  • Force Single Coil (Output)
  • Preset Single Register
  • Reset Slave
  • Force Multiple Coils (Outputs)
  • Preset Multiple Registers
  • Report Slave ID

LED Indicators: LEDs indicate power, status, and discrete level.
Power Requirements:
10 to 36V DC
22 to 26V AC

Supply Current:
Supply         Current Draw
10V DC     90mA maximum
24V DC     40mA maximum
24V AC      75mA rms maximum

Isolation
1500V AC for 60 seconds or 250V AC continuous.
3-way isolation between I/O, network, and power circuits

 

  • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
  • Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
  • High-voltage, high-current, open-source outputs enable direct (high-side) control of external devices
  • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
  • Tandem input/output circuitry (906 models only) connects input buffers with open-source outputs for convenient loopback monitoring of the output state
  • Watchdog timers provide a configurable fail-safe output state for use when host I/O communication is lost
  • Three-way isolation eliminates potential ground loops between power, I/O, and network circuitry
  • 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)

 

Modbus/RS485 an Introduction White Paper (Log in to view the file)
Modbus/RS485 Network an Introduction White Paper This white paper describes the operation of Modbus as it relates to Acromag Series 900MB I/O modules.
How to Configure Kepware KEPServerEX 5.0 for Communications with Acromag BusWorks Modbus I/O Modules Application Note
Configuring Kepware KEPServerEX 5.0 for Communications with Acromag BusWorks Modbus I/O modules. Introduction This document provides example steps for configuring the Kepware KEPServerEX OPC Server for communications with Acromag Busworks Modbus RTU and Modbus TCP/IP Distributed I/O Modules. Once the server is configured, data may be read from or written to the I/O module using...
How to Configure LabVIEW 2009 to Communicate with Acromag BusWorks and EtherStax Modbus I/O Modules Via an OPC Server Application Note
Introduction National Instruments LabVIEW can be used to monitor and control Acromag Busworks and Etherstax Modbus I/O Modules via an OPC server. A separate application note, Configuring Kepware KEPServerEX 5.0 for Communications with Acromag Busworks and Etherstax Modbus I/O Modules, outlines configuration of a KEPServerEX OPC server. This document focuses on setting up controls and...

Manuals

904MB, 905MB, 906MB User Manual (Log in to download the file)

How to Use SIIG USB-to-Serial Cable With Windows Tech Note (Log in to download the file)

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

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

    • 19" rack-mount kit with DIN rail
    $185
    Select options
  • Compare

    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).
    $50
    Select options
  • Compare

    5035 Series: Ethernet Cables

    • Ethernet straight cable, CAT5
    • Ethernet crossover cable, CAT5E
    • Low EMI Double-Shielded Ethernet Patch Cable
    $40$115
    Select options
  • Compare

    900C-SIP: Configuration Software Interface Package

    • Configuration Software
    • USB-to-RS232 Adapter
    • RS232-to-RS485 Adapter
    • Interface Cable
     
    $340
    Select options
  • Compare

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

    $340
    Select options
  • Compare

    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
    $30$40
    Select options

Additional information

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

904MB-0900: 12 input channels, 905MB-0900: 12 output channels, 906MB-0900: 12 input/output channels

Configuration

Windows Software Configuration

Communication

Modbus-RTU, RS422/485

Product Series

BusWorks 900MB

  • Description

    904MB, 905MB, 906MB: Multi-Channel Discrete I/O Modules Description

    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 outputs are intended for current-sourcing or high-side switching applications. The buffered inputs are active-high. These models are the complement of the 901, 902, and 903 units which have low-side output switches and active-low inputs. Socketed pull-down resistors are easily removed or exchanged to satisfy your application requirements.

    The 906MB model has twelve input/output points that may be used as inputs or outputs on a bit-by-bit basis. Outputs may be read back to verify output settings.

    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).

    Active-High Inputs Sourcing Outputs (High-Side Switching)

    Models:
    904MB: 12 input channels
    905MB: 12 output channels
    906MB: 12 input/output channels
    Input:
    Twelve input channels (904, 906 models only)
    0 to 35V DC
    Output:
    Twelve output channels (905, 906 models only)
    6 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

    Discrete Inputs (904 & 906 models only)

    Input Type: 12 active-high, buffered inputs, with a common connection. Inputs include transient suppression devices and series connected 100K ohm resistors, plus diode over-voltage clamps to the internal +5V supply.
    Input Signal Voltage Range: 0 to 35V DC, maximum
    Input Current: 293μA, typical at 35V DC
    Input Signal Threshold: 
    TTL compatible with 100mV of hysteresis, typical
    Thus, Low-to-High threshold is 1.5VDC
    High-to-Low is 1.4VDC, typical
    Limited to TTL levels of 0.8VDC (max. LOW level) and 2.0VDC (min. HIGH level)
    Input Resistance:
    5.6K ohms with standard factory pull-down resistors installed
    100K ohms without pull-downs
    Input Hysteresis: 100mV DC, typical
    Input Response Time:
    500ns for low-to-high, 2μS for high-to-low, typical
    Micro controller samples inputs as a group every 10mS

    Discrete Outputs (905 & 906 models only)

    Output Type: 12 independent, open-source, MOSFET switches that operate as high-side switches.
    Output Voltage Range:
    6 to 35V DC (0 to 250mA/channel continuous)
    External excitation voltage required
    Output ON Resistance: 0.15 ohms maximum
    Output Response Time:
    Outputs update within 50ms of a write command and switch within 5mS of receipt of command.
    Loopback response (906MB) is 1μS low-to high, 5μS high-to-low.

    General

    I/O Pull-downs and Socket: 5.6K ohm pull-down resistor SIPs are installed in sockets at each port (four-channels per port).
    Excitation (per port): External excitation voltage for each four-channel port is limited to 35V or less.
    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 Input Status
    • Read Holding Registers
    • Read Input Registers
    • Force Single Coil (Output)
    • Preset Single Register
    • Reset Slave
    • Force Multiple Coils (Outputs)
    • Preset Multiple Registers
    • Report Slave ID

    LED Indicators: LEDs indicate power, status, and discrete level.
    Power Requirements:
    10 to 36V DC
    22 to 26V AC

    Supply Current:
    Supply         Current Draw
    10V DC     90mA maximum
    24V DC     40mA maximum
    24V AC      75mA rms maximum

    Isolation
    1500V AC for 60 seconds or 250V AC continuous.
    3-way isolation between I/O, network, and power circuits

     

  • Features & Benefits

    • Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
    • Twelve I/O channels in a single inch-wide unit reduces system costs and saves panel space
    • High-voltage, high-current, open-source outputs enable direct (high-side) control of external devices
    • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
    • Tandem input/output circuitry (906 models only) connects input buffers with open-source outputs for convenient loopback monitoring of the output state
    • Watchdog timers provide a configurable fail-safe output state for use when host I/O communication is lost
    • Three-way isolation eliminates potential ground loops between power, I/O, and network circuitry
    • 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)

     

  • Tech Papers

    Modbus/RS485 an Introduction White Paper (Log in to view the file)
    Modbus/RS485 Network an Introduction White Paper This white paper describes the operation of Modbus as it relates to Acromag Series 900MB I/O modules.
    How to Configure Kepware KEPServerEX 5.0 for Communications with Acromag BusWorks Modbus I/O Modules Application Note
    Configuring Kepware KEPServerEX 5.0 for Communications with Acromag BusWorks Modbus I/O modules. Introduction This document provides example steps for configuring the Kepware KEPServerEX OPC Server for communications with Acromag Busworks Modbus RTU and Modbus TCP/IP Distributed I/O Modules. Once the server is configured, data may be read from or written to the I/O module using...
    How to Configure LabVIEW 2009 to Communicate with Acromag BusWorks and EtherStax Modbus I/O Modules Via an OPC Server Application Note
    Introduction National Instruments LabVIEW can be used to monitor and control Acromag Busworks and Etherstax Modbus I/O Modules via an OPC server. A separate application note, Configuring Kepware KEPServerEX 5.0 for Communications with Acromag Busworks and Etherstax Modbus I/O Modules, outlines configuration of a KEPServerEX OPC server. This document focuses on setting up controls and...
  • Specs & Data Sheets

    Manuals

    904MB, 905MB, 906MB User Manual (Log in to download the file)

    How to Use SIIG USB-to-Serial Cable With Windows Tech Note (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
      $185
      Select options
    • Compare

      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).
      $50
      Select options
    • Compare

      5035 Series: Ethernet Cables

      • Ethernet straight cable, CAT5
      • Ethernet crossover cable, CAT5E
      • Low EMI Double-Shielded Ethernet Patch Cable
      $40$115
      Select options
    • Compare

      900C-SIP: Configuration Software Interface Package

      • Configuration Software
      • USB-to-RS232 Adapter
      • RS232-to-RS485 Adapter
      • Interface Cable
       
      $340
      Select options
    • Compare

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

      $340
      Select options
    • Compare

      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
      $30$40
      Select options
  • Additional information

    Additional information

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

    904MB-0900: 12 input channels, 905MB-0900: 12 output channels, 906MB-0900: 12 input/output channels

    Configuration

    Windows Software Configuration

    Communication

    Modbus-RTU, RS422/485

    Product Series

    BusWorks 900MB