901MB, 902MB, 903MB: Multi-Channel Modbus-RTU Discrete I/O Modules
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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
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.
- Description
- Features & Benefits
- Tech Papers
- Specs & Data Sheets
- Software
- Accessories
- Additional information
901MB, 902MB, 903MB: Multi-Channel Modbus-RTU 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 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: 293ÎĽA, 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 250ÎĽs of receipt of a command.
Force Multiple Coils: First coil updates in 250ÎĽs, followed successively by additional coils every 180ÎĽs
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 DCÂ Â 130mA maximum
24V DCÂ Â Â 54mA maximum
24V ACÂ Â Â 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)
Manuals
Brochures
-
20RM-16-DIN: 19” rack-mount kit with DIN rail
- 19" rack-mount kit with DIN rail
$190Select options -
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).
$50Select options -
5035 Series: Ethernet Cables
- Ethernet straight cable, CAT5
- Ethernet crossover cable, CAT5E
- Low EMI Double-Shielded Ethernet Patch Cable
$45 – $115Select options -
900C-SIP: Configuration Software Interface Package
- Configuration Software
- USB-to-RS232 Adapter
- RS232-to-RS485 Adapter
- Interface Cable
$360Select options -
AMTN, AMTX: ActiveX / .NET Controls for Modbus I/O
- Modbus/TCP or Modbus/RTU
- These ActiveX / .NET software controls provide a fast, easy way to communicate with any Modbus slave devices connected to your PC.
- Get your Visual Basic, Visual C, .NET, Excel, or other compatible applications talking Modbus protocol within minutes.
$270 – $370Select options -
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
$100 – $255Select options -
USB-to-Ethernet Adapter
Simplifies configuration of Acromag Ethernet I/O Modules Prevents disruption of existing LANs This device is a USB-to-Ethernet adapter that you can use to communicate with any Acromag Ethernet I/O product for the purpose of setup and re-configuration for your application. It is recommended for initial communication with Acromag Ethernet devices so that you do not have to disrupt your existing network connection.$85Select options
Additional information
Weight | 10 oz |
---|---|
Dimensions | 4.5 × 1.5 × 5 in |
Part Number | 901MB-0900: 12 input channels, 902MB-0900: 12 output channels, 903MB-0900: 12 input & 12 output channels |
Configuration | Windows Software Configuration |
Communication | Modbus-RTU, RS422/485 |
Product Series | BusWorks 900MB |
-
Description
901MB, 902MB, 903MB: Multi-Channel Modbus-RTU 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 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, DPerformance 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: 293ÎĽA, 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, typicalDiscrete 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 250ÎĽs of receipt of a command.
Force Multiple Coils: First coil updates in 250ÎĽs, followed successively by additional coils every 180ÎĽsGeneral
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 ACSupply Current:
Supply     Current Draw
10V DCÂ Â 130mA maximum
24V DCÂ Â Â 54mA maximum
24V ACÂ Â Â 95mA maximumIsolation:
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-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)
-
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 NoteConfiguring 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 NoteIntroduction 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
Brochures
-
Software
BusWorks 900MB Modbus RTU Configuration Software (Log in to download the file) -
Accessories
-
20RM-16-DIN: 19” rack-mount kit with DIN rail
- 19" rack-mount kit with DIN rail
$190Select options -
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).
$50Select options -
5035 Series: Ethernet Cables
- Ethernet straight cable, CAT5
- Ethernet crossover cable, CAT5E
- Low EMI Double-Shielded Ethernet Patch Cable
$45 – $115Select options -
900C-SIP: Configuration Software Interface Package
- Configuration Software
- USB-to-RS232 Adapter
- RS232-to-RS485 Adapter
- Interface Cable
$360Select options -
AMTN, AMTX: ActiveX / .NET Controls for Modbus I/O
- Modbus/TCP or Modbus/RTU
- These ActiveX / .NET software controls provide a fast, easy way to communicate with any Modbus slave devices connected to your PC.
- Get your Visual Basic, Visual C, .NET, Excel, or other compatible applications talking Modbus protocol within minutes.
$270 – $370Select options -
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
$100 – $255Select options -
USB-to-Ethernet Adapter
Simplifies configuration of Acromag Ethernet I/O Modules Prevents disruption of existing LANs This device is a USB-to-Ethernet adapter that you can use to communicate with any Acromag Ethernet I/O product for the purpose of setup and re-configuration for your application. It is recommended for initial communication with Acromag Ethernet devices so that you do not have to disrupt your existing network connection.$85Select options
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-
Additional information
Additional information
Weight 10 oz Dimensions 4.5 × 1.5 × 5 in Part Number 901MB-0900: 12 input channels, 902MB-0900: 12 output channels, 903MB-0900: 12 input & 12 output channels
Configuration Windows Software Configuration
Communication Modbus-RTU, RS422/485
Product Series BusWorks 900MB
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