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Product short description:
  • 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
Kindly go to setting page and check the option "Place them manually"

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.

The 903MB 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-Low Inputs Sinking Outputs (Low-Side Switching)

Models:
901MB: 12 input channels
902MB: 12 output channels
903MB: 12 input/output channels
Input:
Twelve input channels (901, 903 models only)
0 to 35V DC
Output:
Twelve output channels (902, 903 models only)
O 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 (901 & 903 models only)

Input Type:
12 active-low, 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
Low-to-High threshold is 1.7VDC
High-to-Low is 1.6VDC, typical
Limited to TTL levels of 0.8VDC (max. LOW level) and 2.0VDC (min. HIGH level)
Input Resistance: 100K ohms, typical
Input Hysteresis: 100mV DC, typical

Discrete Outputs (902 & 903 models only)

Output Type: 12 independent, open-drain, DMOS MOSFET switches with a common source connection that operate as low-side switches.
Output Voltage Range:
0 to 35V DC max. (0 to 500mA/channel continuous)
External voltage source required
Output ON Resistance: 0.28 ohms maximum
Output Response Time:
Force Single Coil: Output updates within 250μs of receipt of a command.
Force Multiple Coils: First coil updates in 250μs, followed successively by additional coils every 180μs

General

I/O Pull-ups and Socket: 5.6K ohm pull-up 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
  • 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    130mA maximum
24V DC      54mA maximum
24V AC      95mA 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-drain outputs enable direct (low-side) control of external devices
  • High-voltage buffered inputs monitor discrete levels from a variety of industrial devices
  • Tandem input/output circuitry (903 models only) connects input buffers with open-drain outputs for convenient loop-back monitoring of the output state
  • Outputs have built-in over-temperature and over-current shut-down protection, plus active clamping circuits for switching inductive loads
  • 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 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)
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

901MB, 902MB, 903MB 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 N/A
Dimensions 12 × 13 × 3 in
Part Number

4001-096: USB Ethernet Adapter

  • Description

    Standards

    USB 1.0, 1.1, 2.0 IEEE 802.3, IEEE 802.3u

    Ports One Type-A Male Connector, One RJ-45 Port
    LEDs Link/Activity

    Cabling
    Type Cat 5 Ethernet Cable

    Dimensions
    7.96” x 1.00” x 0.69” (202.3 x 25.35 x 17.65 mm)

    Weight
    0.8 oz (23 kg)

    Power
    3.3V low power consumption

    Certification
    FCC Class B, CE Class B, UL

    Operating Temp.
    32 to 158°F (0 to 70°C)

    Storage Temp.
    32 to 158°F (0 to 70°C)

    Operating Humidity
    10 to 90% non-condensing

    Storage Humidity
    10 to 90% non-condensing

    Includes: Package Contents

    • One USB Ethernet Adapter
    • One Driver Installation CD
    • One Quick Installation Guide
    • One User Guide included on Installation CD
    • One Acromag Ethernet I/O Instruction Sheet
    • One IP Address Batch Configuration CD
  • 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-drain outputs enable direct (low-side) control of external devices
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  • Tech Papers

    Modbus/RS485 an Introduction White Paper (Log in to view the file)
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    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

    901MB, 902MB, 903MB 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 N/A
    Dimensions 12 × 13 × 3 in
    Part Number

    4001-096: USB Ethernet Adapter