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

Weight 8 oz
Dimensions 12 × 13 × 3 in
Part Number

TBK-B01: two 6-position barrier strip style, TBK-B02: four 6-position barrier strip style, TBK-B03: one 3-position and three 6-position barrier strip style, TBK-S01: two 6-position spring clamp style, TBK-S02: four 6-position spring clamp style, TBK-S03: one 3-position and three 6-position spring clamp style

  • Description

    These optional terminal blocks provide safe and secure wiring connections. Large captive screw terminals or spring clamps enable fast, easy connections. Pluggable terminals are removable for simple disconnection of the module without disturbing the wiring.

    Optional terminal blocks are compatible with Acromag’s “white box” modules including BusWorks 900 Series, IntelliPack 800 Series, and isolated transmitters 600 Series.

    Barrier Strip Terminal Blocks

    Wire Range: 12-26 AWG
    Safety Ratings: UL, CSA, CE, TUV.
    Current/Voltage Rating: 15A, 300V.
    Pin Spacing: 5.08mm (0.2”).
    Housing Material: PPO, UL 94 V-0, Black.
    Contacts: Tin-Lead Plated Phosphor Bronze.
    Screw: M3, Nickel Plated Steel.
    Insulation Resistance: ≥105 Megohms.
    Dielectric Withstand: <3000V.

    Spring Clamp Terminal Blocks

    Wire Range: 12-28 AWG.
    Safety Ratings: UL, CSA, CE, TUV.
    Current/Voltage Rating: 15A, 300V.
    Pin Spacing: 5.08mm (0.2”)
    Housing Material: PPO, UL 94 V-0, Black.
    Contacts: Tin-Lead Plated Phosphor Bronze.
    Spring Clamp: Stainless Steel.
    Insulation Resistance: ≥105 Megohms.
    Dielectric Withstand: <3000V.

    Acromag Standard Cage Clamp Terminal Blocks

    Wire Range: 12-24 AWG.
    Current/Voltage Rating: 12A, 300V (UL).
    Pin Spacing: 5.08mm (0.2”).
    Housing Material: UL 94 V-0.
    Terminal: Brass, nickel plated.
    Wire Protector with Contact: Copper alloy tin plating.
    Screw: M3, steel, nickel over copper plating.
    Contact Resistance: ≤10 milliohms per circuit.

  • 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)
  • Specs & Data Sheets

  • Software

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

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

      • 19" rack-mount kit with DIN rail
      $175
      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).
      $45
      Select options
    • Compare

      5035 Series: Ethernet Cables

      • Ethernet straight cable, CAT5
      • Ethernet crossover cable, CAT5E
      • Low EMI Double-Shielded Ethernet Patch Cable
      $35$110
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      900C-SIP: Configuration Software Interface Package

      • Configuration Software
      • USB-to-RS232 Adapter
      • RS232-to-RS485 Adapter
      • Interface Cable
      $320
      Read more
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      AMTN, AMTX: ActiveX / .NET Controls for Modbus I/O

      $320
      Select options
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      PS5R: Slim Line Power Supplies

      • 10W, 15W, 30W, 60W, 90W, 120W, and 240W models
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      • 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
  • Additional information

    Additional information

    Weight 8 oz
    Dimensions 12 × 13 × 3 in
    Part Number

    TBK-B01: two 6-position barrier strip style, TBK-B02: four 6-position barrier strip style, TBK-B03: one 3-position and three 6-position barrier strip style, TBK-S01: two 6-position spring clamp style, TBK-S02: four 6-position spring clamp style, TBK-S03: one 3-position and three 6-position spring clamp style