917MB, 918MB: DC Current/Voltage Modbus-RTU Output Modules with Discrete Outputs
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Product short description:
- 4 analog output channels
- 0 to 20mA or 0 to 10V DC output range
- 4 discrete output channels, open drain MOSFETS (1A DC loads, 0 to 35V DC)
- 10 to 36V DC, 24V AC power
- Modbus RTU high-speed RS-485
These modules drive four analog output channels and also feature four discrete outputs for on/off control. Isolation separates the output, 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
917MB, 918MB: DC Current/Voltage Modbus-RTU Output Modules with Discrete Outputs Description
These modules drive four analog output channels and also feature four discrete outputs for on/off control. Isolation separates the 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 analog outputs generate a signal based on communication from the host. They accommodate wide DC voltage or current ranges.
Discrete outputs provide simple on/off switching capability for external devices.
Combining analog outputs, on/off controllers, 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 make it reliable for both control room and distributed field I/O use in a broad range of temperature control applications.
Custom module configurations are also possible (consult factory for details).
DC Current or DC Voltage Outputs
Discrete Outputs
Models:
917MB: 4 current output channels
918MB: 4 voltage output channels
Analog Output:
917MB: 0 to 20mA, 4 to 20mA, 0 to 1mA DC
918MB: 0 to 10V, 0 to 5V, 0 to 1V DC
Discrete Output:
Four output channels:
Open-drain MOSFETs (1A DC loads)
0 to 35V DC
Network Communication: Modbus-RTU high-speed RS-485
Power Requirement: 12 to 36V DC (917MB), 10 to 36V DC (918MB), 24V AC
Approvals:
CE marked. UL, cUL listed
Class I; Division 2; Groups A, B, C, D
Performance Specifications
General Analog Output
Resolution: See current/voltage output specifications for more information.
Ambient Temperature Effect: Better than ±0.001% of output span per °C, or ±1.0uV/°C, whichever is greater.
Ambient Temperature:
Operation (917MB): -25°C to 60°C* (-13°F to 140°F*)
Operation (918MB): -25°C to 70°C (-13°F to 158°F)
Storage: -40°C to +85°C (-40°F to +185°F)
* Limit 917MB maximum ambient to 50°C (122°F) when using supply voltages less than 15V DC
Current Output (917MB)
DC Current Output Ranges: Range user-configured. Range selected applies to all channels.
Output Range   Resolution   Accuracy (% span)
0 to 1mA        0.554% ±2.0%      (±0.002mA)
0 to 20mA       0.028% ±0.1%      (±0.02mA)
4 to 20mA       0.035% ±0.1%      (±0.02mA)
Maximum Output Current: 22.5mA DC typical
Integral Non-Linearity: ±0.1% of span or ±2 LSB typical, whichever is larger, for spans equal to or greater than 16mA.
Output Compliance: 12V minimum, 12.7V typical
Output Load Resistance Range: 0 to 630 ohms typical
Response Time: 11ms typical into 500 ohms, for measurement to reach 98% of the final value in response to a step command. Actual response time will vary with load.
Voltage Output (918MB)
DC Voltage Output Ranges: Range user-configured. Selection applies to all channels.
Output Range   Resolution   Accuracy (% span)
0 to 1V           0.274% ±0.6%       (±6mV)
0 to 5V          0.055% ±0.1%       (±5mV)
0 to 10V         0.027% ±0.1%       (±10mV)
Maximum Output Voltage: 11.255V DC typical
Integral Non-Linearity: ±0.1% of span or ±2 LSB typical, whichever is larger, for spans equal to or greater than 5V
Output Current: 0 to 10mA DC maximum
Output Impedance: 1 ohm
Output Short Circuit Protection: Included
Response Time: 110ÎĽs rise time typical, 150ÎĽs fall time typical, unloaded, for output to reach 98% of the final value in response to a step command. Time varies with load.
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 (up to 1A/channel continuous)
External voltage source required
Output ON Resistance: 0.15 ohms maximum
Operation: Digital outputs are set to their OFF state following a software or power-on reset. Outputs may 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.
Output Response Time: 4.1ms typical, from receipt of command to gate transition of the output MOSFET
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 Report Slave ID
- Read Holding Registers Reset Slave
- Read Input Registers
- Force Single Coil (Output)
- Preset Single Register
- Force Multiple Coils (Output)
- Preset Multiple Registers
LED Indicators: LEDs indicate power, status, and discrete level/alarm
Power and Isolation
Power Requirements:
10 to 36V DC (918MB), 12 to 36V DC (917MB)
22 to 26V AC
Supply Current:
Supply  Current Draw (917)      Current Draw (918)
10V DC    Not Recommended       100mA maximum
12V DC    275mA maximum          85mA maximum
24V DC    120mA maximum          45mA maximum
24V AC     210mA rms maximum     85mA rms maximum
Isolation:
1500V AC for 60 seconds or 250V AC continuous.
3-way isolation between outputs, network, and power circuits.
- Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
- 12-bit D/A yields 0.1% of span resolution and accuracy
- Four outputs in a single inch-wide module reduces system costs and saves panel space
- Four discrete outputs enable 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 failsafe output state for use when host I/O communication is lost
- Three-way isolation eliminates potential ground loops between power, output 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 60°C (-13°F to 140°F), limit 917MB ambient to 50°C maximum for supply voltages less than 15V
Manuals
Brochures
-
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5020-350: Toroidal AC Current Sensor
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- Highly accurate toroidal instrument transformer that converts an AC current signal to a safe, low level, DC milliampere signal (0 to 11.17mA).
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5035 Series: Ethernet Cables
- Ethernet straight cable, CAT5
- Ethernet crossover cable, CAT5E
- Low EMI Double-Shielded Ethernet Patch Cable
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900C-SIP: Configuration Software Interface Package
- Configuration Software
- USB-to-RS232 Adapter
- RS232-to-RS485 Adapter
- Interface Cable
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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
$115 – $293.25Select options -
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
$40.25 – $51.75Select options
Additional information
Weight | 16 oz |
---|---|
Dimensions | 13 × 12 × 3 in |
Part Number | 917MB-0900: DC Current Output Module, 918MB-0900: DC Voltage Output Module |
Configuration | Windows Software Configuration |
Communication | Modbus-RTU, RS422/485 |
Product Series | BusWorks 900MB |
-
Description
917MB, 918MB: DC Current/Voltage Modbus-RTU Output Modules with Discrete Outputs Description
These modules drive four analog output channels and also feature four discrete outputs for on/off control. Isolation separates the 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 analog outputs generate a signal based on communication from the host. They accommodate wide DC voltage or current ranges.
Discrete outputs provide simple on/off switching capability for external devices.
Combining analog outputs, on/off controllers, 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 make it reliable for both control room and distributed field I/O use in a broad range of temperature control applications.
Custom module configurations are also possible (consult factory for details).
DC Current or DC Voltage Outputs
Discrete OutputsModels:
917MB: 4 current output channels
918MB: 4 voltage output channels
Analog Output:
917MB: 0 to 20mA, 4 to 20mA, 0 to 1mA DC
918MB: 0 to 10V, 0 to 5V, 0 to 1V DC
Discrete Output:
Four output channels:
Open-drain MOSFETs (1A DC loads)
0 to 35V DC
Network Communication: Modbus-RTU high-speed RS-485
Power Requirement: 12 to 36V DC (917MB), 10 to 36V DC (918MB), 24V AC
Approvals:
CE marked. UL, cUL listed
Class I; Division 2; Groups A, B, C, DPerformance Specifications
General Analog Output
Resolution: See current/voltage output specifications for more information.
Ambient Temperature Effect: Better than ±0.001% of output span per °C, or ±1.0uV/°C, whichever is greater.
Ambient Temperature:
Operation (917MB): -25°C to 60°C* (-13°F to 140°F*)
Operation (918MB): -25°C to 70°C (-13°F to 158°F)
Storage: -40°C to +85°C (-40°F to +185°F)
* Limit 917MB maximum ambient to 50°C (122°F) when using supply voltages less than 15V DCCurrent Output (917MB)
DC Current Output Ranges: Range user-configured. Range selected applies to all channels.
Output Range   Resolution   Accuracy (% span)
0 to 1mA        0.554% ±2.0%      (±0.002mA)
0 to 20mA       0.028% ±0.1%      (±0.02mA)
4 to 20mA       0.035% ±0.1%      (±0.02mA)Maximum Output Current: 22.5mA DC typical
Integral Non-Linearity: ±0.1% of span or ±2 LSB typical, whichever is larger, for spans equal to or greater than 16mA.
Output Compliance: 12V minimum, 12.7V typical
Output Load Resistance Range: 0 to 630 ohms typical
Response Time: 11ms typical into 500 ohms, for measurement to reach 98% of the final value in response to a step command. Actual response time will vary with load.Voltage Output (918MB)
DC Voltage Output Ranges: Range user-configured. Selection applies to all channels.
Output Range   Resolution   Accuracy (% span)
0 to 1V           0.274% ±0.6%       (±6mV)
0 to 5V          0.055% ±0.1%       (±5mV)
0 to 10V         0.027% ±0.1%       (±10mV)Maximum Output Voltage: 11.255V DC typical
Integral Non-Linearity: ±0.1% of span or ±2 LSB typical, whichever is larger, for spans equal to or greater than 5V
Output Current: 0 to 10mA DC maximum
Output Impedance: 1 ohm
Output Short Circuit Protection: Included
Response Time: 110ÎĽs rise time typical, 150ÎĽs fall time typical, unloaded, for output to reach 98% of the final value in response to a step command. Time varies with load.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 (up to 1A/channel continuous)
External voltage source required
Output ON Resistance: 0.15 ohms maximum
Operation: Digital outputs are set to their OFF state following a software or power-on reset. Outputs may 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.
Output Response Time: 4.1ms typical, from receipt of command to gate transition of the output MOSFETCommunication
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 Report Slave ID
- Read Holding Registers Reset Slave
- Read Input Registers
- Force Single Coil (Output)
- Preset Single Register
- Force Multiple Coils (Output)
- Preset Multiple Registers
LED Indicators: LEDs indicate power, status, and discrete level/alarm
Power and Isolation
Power Requirements:
10 to 36V DC (918MB), 12 to 36V DC (917MB)
22 to 26V ACSupply Current:
Supply  Current Draw (917)      Current Draw (918)
10V DC    Not Recommended       100mA maximum
12V DC    275mA maximum          85mA maximum
24V DC    120mA maximum          45mA maximum
24V AC     210mA rms maximum     85mA rms maximumIsolation:
1500V AC for 60 seconds or 250V AC continuous.
3-way isolation between outputs, network, and power circuits. -
Features & Benefits
- Standard Modbus RTU protocol with high-speed RS-485 communication (up to 115K bps)
- 12-bit D/A yields 0.1% of span resolution and accuracy
- Four outputs in a single inch-wide module reduces system costs and saves panel space
- Four discrete outputs enable 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 failsafe output state for use when host I/O communication is lost
- Three-way isolation eliminates potential ground loops between power, output 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 60°C (-13°F to 140°F), limit 917MB ambient to 50°C maximum for supply voltages less than 15V
-
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
$218.50Select 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).
$57.50Select options -
5035 Series: Ethernet Cables
- Ethernet straight cable, CAT5
- Ethernet crossover cable, CAT5E
- Low EMI Double-Shielded Ethernet Patch Cable
$51.75 – $132.25Select options -
900C-SIP: Configuration Software Interface Package
- Configuration Software
- USB-to-RS232 Adapter
- RS232-to-RS485 Adapter
- Interface Cable
$414Select 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
$115 – $293.25Select options -
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
$40.25 – $51.75Select options
-
-
Additional information
Additional information
Weight 16 oz Dimensions 13 × 12 × 3 in Part Number 917MB-0900: DC Current Output Module, 918MB-0900: DC Voltage Output Module
Configuration Windows Software Configuration
Communication Modbus-RTU, RS422/485
Product Series BusWorks 900MB
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