Technical specifications, features, applications and purchasing information.
| Brand | Allen-Bradley |
| Model | 2085-OF4 |
| Product Category | Analog Output Module |
| Manufacturer | Rockwell Automation |
| Product Family | Micro800 |
| Module Series | Bulletin 2085 Expansion I/O |
| Module Function | Analog Voltage and Current Output |
| Number of Output Channels | 4 |
| Output Channel Identification | Channels 0, 1, 2 and 3 |
| Supported Voltage Output Ranges | -10 to +10 VDC or 0 to 10 VDC |
| Supported Current Output Ranges | 4 to 20 mA or 0 to 20 mA |
| Default Current Output Range | 4 to 20 mA |
| Unconfigured Current Output | 0 mA Until Module Configuration |
| Output Mode Selection | Software Configurable by Channel |
| Resolution, Unipolar | 12 Bits |
| Resolution, Bipolar | 11 Bits Plus Sign |
| Voltage Resolution, Unipolar | 2.56 mV per Count |
| Voltage Resolution, Bipolar | 5.13 mV per Count |
| Current Resolution | 5.13 µA per Count |
| Data Format | Left-Justified, 16-Bit Two's Complement |
| Maximum Conversion Time | 2 ms per Channel |
| Step Response Time to 63% | 2 ms |
| Voltage Output Accuracy at 25°C | 0.133% of Full Scale or Better |
| Current Output Accuracy at 25°C | 0.425% of Full Scale or Better |
| Voltage Accuracy Temperature Drift | 0.0045% of Full Scale per °C |
| Current Accuracy Temperature Drift | 0.0069% of Full Scale per °C |
| Maximum Load Current, Voltage Output | 3 mA |
| Current Output Resistive Load | 15 to 500 Ω at 24 VDC |
| I/O Isolation | Channel-to-System Isolation |
| Isolation Voltage | 50 V Continuous, Reinforced Insulation Type |
| Isolation Type Test | 720 VDC for 60 Seconds |
| Channel-to-Channel Isolation | Not Specified as Independently Isolated Channels |
| Backplane Current Draw at 5 VDC | 160 mA Maximum |
| Backplane Current Draw at 24 VDC | 120 mA Maximum |
| Total Power Dissipation | 3.7 W |
| Status Indicator | 1 Green Module Health LED |
| Output Wiring Connector | One 12-Pin Removable Terminal Block |
| Output Wiring Terminals | CO-0 to CO-3, VO-0 to VO-3 and COM0 to COM3 |
| Recommended Signal Wiring | Shielded Copper Conductors |
| Solid Conductor Size | 0.34 to 2.5 mm², 22 to 14 AWG |
| Stranded Conductor Size | 0.20 to 2.5 mm², 22 to 14 AWG |
| Terminal Screw Torque | 0.5 to 0.6 N·m |
| Required End-of-Bus Module | 2085-ECR Bus Terminator |
| Mounting Methods | DIN Rail or Panel Mount |
| DIN Rail Size | 35 × 7.5 mm |
| Module Dimensions, H × W × D | 90 × 28 × 87 mm |
| Approximate Shipping Weight | 200 g |
| Recommended Ventilation Clearance | 50.8 mm on All Sides |
| Enclosure Classification | Open-Type Equipment |
| Operating Temperature | -20 to +65°C |
| Storage Temperature | -40 to +85°C |
| Relative Humidity | 5 to 95%, Noncondensing |
| Maximum Installation Altitude Without Derating | 2000 m |
| Operating Vibration | 2 g at 10 to 500 Hz |
| Operating Shock | 25 g |
| Environment | Pollution Degree 2, Overvoltage Category II |
| Product Lifecycle Status | Active |
| UPC | 885630082394 |
| Related Analog Input Module | 2085-IF4 |
| Related Conformal-Coated Model | 2085-OF4K |
The Allen-Bradley 2085-OF4 is a Micro800 expansion I/O module featuring four analog output channels. It enables compatible Micro850 and Micro870 programmable controllers to generate analog control signals for connected industrial devices.
Each output channel can be configured for 0–10 VDC, -10 to +10 VDC, 0–20 mA or 4–20 mA operation. The default current output configuration is 4–20 mA, supporting commonly used industrial control interfaces.
The module provides 12-bit unipolar resolution or 11 bits plus sign for bipolar signals. Its stated resolution is 2.56 mV per count for unipolar voltage, 5.13 mV per count for bipolar voltage and 5.13 µA per count for current outputs.
A maximum conversion time of 2 ms per channel and a 2 ms response time to 63% of the output step provide specified performance for industrial analog control applications. Actual system response also depends on PLC execution and connected equipment.
The 2085-OF4 provides reinforced channel-to-system isolation rated at 50 V continuous. Its open-type construction, green health status LED and removable terminal block support installation and troubleshooting in appropriately designed industrial control cabinets.
With a 28 mm module width, the 2085-OF4 integrates into compatible Micro800 expansion systems through the expansion bus. DIN rail or panel mounting is supported, with a required 2085-ECR terminator at the end of the expansion I/O assembly.
We support online purchase of the Allen-Bradley 2085-OF4 Analog Output Module. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
What is the Allen-Bradley 2085-OF4?
It is a Rockwell Automation Micro800 expansion I/O module providing four configurable analog output channels for compatible Micro850 and Micro870 controllers.
How many analog outputs does the module provide?
The 2085-OF4 provides four analog output channels, identified as channels 0 through 3.
Does the 2085-OF4 support both voltage and current outputs?
Yes. Supported output ranges include 0–10 VDC, -10 to +10 VDC, 0–20 mA and 4–20 mA. Each channel must be configured for the appropriate output range and wired to its corresponding terminals.
What is the default analog output configuration?
The default current output range is 4–20 mA. Rockwell Automation specifies that the current output remains at 0 mA until the module is configured.
What is the output resolution?
The module provides 12-bit resolution for unipolar output and 11 bits plus sign for bipolar output. Voltage and current resolution depend on the selected signal range.
What is the analog output conversion speed?
The manufacturer specifies a maximum conversion time of 2 ms per channel and a 2 ms step response time to 63%. PLC scan time and field-device characteristics can affect overall system response.
Which PLC controllers are compatible with 2085-OF4?
The 2085-OF4 belongs to the expansion I/O family used with compatible Micro850 and Micro870 controllers. Confirm the specific controller catalog number, firmware and supported number of expansion modules before installation.
Can the 2085-OF4 be used as an analog input module?
No. The 2085-OF4 generates analog output signals. For compatible analog input applications, Rockwell Automation offers separate modules such as the 2085-IF4.
Does the module need a separate power supply?
The module draws backplane power through the compatible Micro800 expansion bus. Rockwell Automation specifies maximum bus current draws of 160 mA at 5 VDC and 120 mA at 24 VDC. The controller power budget and field wiring requirements must be checked.
What is the maximum supported load for a voltage output?
The maximum load current on a voltage output is 3 mA. The connected device must have suitable input characteristics for the selected voltage range.
What is the supported current output load resistance?
The manufacturer specifies a resistive load range of 15–500 Ω at 24 VDC for the current output. Correct loop wiring and load resistance are necessary for reliable signal operation.
Are the analog channels electrically isolated?
The manufacturer specifies 50 V continuous reinforced isolation between the field-side channels and the controller system. This should not be interpreted as independent galvanic isolation between every output channel.
Does the expansion I/O system need a bus terminator?
Yes. Rockwell Automation requires a 2085-ECR bus terminator at the end of the expansion I/O assembly. Omitting the terminator can cause a controller hard fault.
Can the 2085-OF4 be mounted on a DIN rail?
Yes. Both DIN rail and panel mounting are supported. The manufacturer specifies a 35 × 7.5 mm DIN rail and recommends appropriate enclosure clearance for ventilation.
What is the operating temperature range?
The specified operating temperature range is -20 to +65°C. The module is open-type equipment and must be installed in an enclosure suitable for the intended industrial environment.
What is the difference between 2085-OF4 and 2085-OF4K?
Both provide the same four-channel analog output functionality and electrical specifications. The 2085-OF4K is the conformal-coated version, intended for applications requiring that additional protective treatment.
What should be checked before ordering?
Confirm the exact catalog number 2085-OF4, compatibility with the Micro850 or Micro870 controller, four analog output channels, required voltage or current ranges, 12-bit resolution, backplane power budget, 12-pin removable terminal block, expansion bus terminator, open-type enclosure requirements and the distinction between the standard module and conformal-coated 2085-OF4K.
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| Brand | Allen-Bradley |
| Model | 2085-OF4 |
| Product Category | Analog Output Module |
| Manufacturer | Rockwell Automation |
| Product Family | Micro800 |
| Module Series | Bulletin 2085 Expansion I/O |
| Module Function | Analog Voltage and Current Output |
| Number of Output Channels | 4 |
| Output Channel Identification | Channels 0, 1, 2 and 3 |
| Supported Voltage Output Ranges | -10 to +10 VDC or 0 to 10 VDC |
| Supported Current Output Ranges | 4 to 20 mA or 0 to 20 mA |
| Default Current Output Range | 4 to 20 mA |
| Unconfigured Current Output | 0 mA Until Module Configuration |
| Output Mode Selection | Software Configurable by Channel |
| Resolution, Unipolar | 12 Bits |
| Resolution, Bipolar | 11 Bits Plus Sign |
| Voltage Resolution, Unipolar | 2.56 mV per Count |
| Voltage Resolution, Bipolar | 5.13 mV per Count |
| Current Resolution | 5.13 µA per Count |
| Data Format | Left-Justified, 16-Bit Two's Complement |
| Maximum Conversion Time | 2 ms per Channel |
| Step Response Time to 63% | 2 ms |
| Voltage Output Accuracy at 25°C | 0.133% of Full Scale or Better |
| Current Output Accuracy at 25°C | 0.425% of Full Scale or Better |
| Voltage Accuracy Temperature Drift | 0.0045% of Full Scale per °C |
| Current Accuracy Temperature Drift | 0.0069% of Full Scale per °C |
| Maximum Load Current, Voltage Output | 3 mA |
| Current Output Resistive Load | 15 to 500 Ω at 24 VDC |
| I/O Isolation | Channel-to-System Isolation |
| Isolation Voltage | 50 V Continuous, Reinforced Insulation Type |
| Isolation Type Test | 720 VDC for 60 Seconds |
| Channel-to-Channel Isolation | Not Specified as Independently Isolated Channels |
| Backplane Current Draw at 5 VDC | 160 mA Maximum |
| Backplane Current Draw at 24 VDC | 120 mA Maximum |
| Total Power Dissipation | 3.7 W |
| Status Indicator | 1 Green Module Health LED |
| Output Wiring Connector | One 12-Pin Removable Terminal Block |
| Output Wiring Terminals | CO-0 to CO-3, VO-0 to VO-3 and COM0 to COM3 |
| Recommended Signal Wiring | Shielded Copper Conductors |
| Solid Conductor Size | 0.34 to 2.5 mm², 22 to 14 AWG |
| Stranded Conductor Size | 0.20 to 2.5 mm², 22 to 14 AWG |
| Terminal Screw Torque | 0.5 to 0.6 N·m |
| Required End-of-Bus Module | 2085-ECR Bus Terminator |
| Mounting Methods | DIN Rail or Panel Mount |
| DIN Rail Size | 35 × 7.5 mm |
| Module Dimensions, H × W × D | 90 × 28 × 87 mm |
| Approximate Shipping Weight | 200 g |
| Recommended Ventilation Clearance | 50.8 mm on All Sides |
| Enclosure Classification | Open-Type Equipment |
| Operating Temperature | -20 to +65°C |
| Storage Temperature | -40 to +85°C |
| Relative Humidity | 5 to 95%, Noncondensing |
| Maximum Installation Altitude Without Derating | 2000 m |
| Operating Vibration | 2 g at 10 to 500 Hz |
| Operating Shock | 25 g |
| Environment | Pollution Degree 2, Overvoltage Category II |
| Product Lifecycle Status | Active |
| UPC | 885630082394 |
| Related Analog Input Module | 2085-IF4 |
| Related Conformal-Coated Model | 2085-OF4K |
The Allen-Bradley 2085-OF4 is a Micro800 expansion I/O module featuring four analog output channels. It enables compatible Micro850 and Micro870 programmable controllers to generate analog control signals for connected industrial devices.
Each output channel can be configured for 0–10 VDC, -10 to +10 VDC, 0–20 mA or 4–20 mA operation. The default current output configuration is 4–20 mA, supporting commonly used industrial control interfaces.
The module provides 12-bit unipolar resolution or 11 bits plus sign for bipolar signals. Its stated resolution is 2.56 mV per count for unipolar voltage, 5.13 mV per count for bipolar voltage and 5.13 µA per count for current outputs.
A maximum conversion time of 2 ms per channel and a 2 ms response time to 63% of the output step provide specified performance for industrial analog control applications. Actual system response also depends on PLC execution and connected equipment.
The 2085-OF4 provides reinforced channel-to-system isolation rated at 50 V continuous. Its open-type construction, green health status LED and removable terminal block support installation and troubleshooting in appropriately designed industrial control cabinets.
With a 28 mm module width, the 2085-OF4 integrates into compatible Micro800 expansion systems through the expansion bus. DIN rail or panel mounting is supported, with a required 2085-ECR terminator at the end of the expansion I/O assembly.
We support online purchase of the Allen-Bradley 2085-OF4 Analog Output Module. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
What is the Allen-Bradley 2085-OF4?
It is a Rockwell Automation Micro800 expansion I/O module providing four configurable analog output channels for compatible Micro850 and Micro870 controllers.
How many analog outputs does the module provide?
The 2085-OF4 provides four analog output channels, identified as channels 0 through 3.
Does the 2085-OF4 support both voltage and current outputs?
Yes. Supported output ranges include 0–10 VDC, -10 to +10 VDC, 0–20 mA and 4–20 mA. Each channel must be configured for the appropriate output range and wired to its corresponding terminals.
What is the default analog output configuration?
The default current output range is 4–20 mA. Rockwell Automation specifies that the current output remains at 0 mA until the module is configured.
What is the output resolution?
The module provides 12-bit resolution for unipolar output and 11 bits plus sign for bipolar output. Voltage and current resolution depend on the selected signal range.
What is the analog output conversion speed?
The manufacturer specifies a maximum conversion time of 2 ms per channel and a 2 ms step response time to 63%. PLC scan time and field-device characteristics can affect overall system response.
Which PLC controllers are compatible with 2085-OF4?
The 2085-OF4 belongs to the expansion I/O family used with compatible Micro850 and Micro870 controllers. Confirm the specific controller catalog number, firmware and supported number of expansion modules before installation.
Can the 2085-OF4 be used as an analog input module?
No. The 2085-OF4 generates analog output signals. For compatible analog input applications, Rockwell Automation offers separate modules such as the 2085-IF4.
Does the module need a separate power supply?
The module draws backplane power through the compatible Micro800 expansion bus. Rockwell Automation specifies maximum bus current draws of 160 mA at 5 VDC and 120 mA at 24 VDC. The controller power budget and field wiring requirements must be checked.
What is the maximum supported load for a voltage output?
The maximum load current on a voltage output is 3 mA. The connected device must have suitable input characteristics for the selected voltage range.
What is the supported current output load resistance?
The manufacturer specifies a resistive load range of 15–500 Ω at 24 VDC for the current output. Correct loop wiring and load resistance are necessary for reliable signal operation.
Are the analog channels electrically isolated?
The manufacturer specifies 50 V continuous reinforced isolation between the field-side channels and the controller system. This should not be interpreted as independent galvanic isolation between every output channel.
Does the expansion I/O system need a bus terminator?
Yes. Rockwell Automation requires a 2085-ECR bus terminator at the end of the expansion I/O assembly. Omitting the terminator can cause a controller hard fault.
Can the 2085-OF4 be mounted on a DIN rail?
Yes. Both DIN rail and panel mounting are supported. The manufacturer specifies a 35 × 7.5 mm DIN rail and recommends appropriate enclosure clearance for ventilation.
What is the operating temperature range?
The specified operating temperature range is -20 to +65°C. The module is open-type equipment and must be installed in an enclosure suitable for the intended industrial environment.
What is the difference between 2085-OF4 and 2085-OF4K?
Both provide the same four-channel analog output functionality and electrical specifications. The 2085-OF4K is the conformal-coated version, intended for applications requiring that additional protective treatment.
What should be checked before ordering?
Confirm the exact catalog number 2085-OF4, compatibility with the Micro850 or Micro870 controller, four analog output channels, required voltage or current ranges, 12-bit resolution, backplane power budget, 12-pin removable terminal block, expansion bus terminator, open-type enclosure requirements and the distinction between the standard module and conformal-coated 2085-OF4K.
