Technical specifications, features, applications and purchasing information.
| Brand | Allen-Bradley |
| Model Number | 1746-NO4I |
| Product Category | Analog Output Module |
| Product Family | SLC 500 |
| Product Bulletin | Bulletin 1746 |
| Module Type | Analog Current Output Module |
| Total Output Channels | 4 |
| Analog Input Channels | None |
| Output Signal Type | Analog Current |
| Normal Output Current Range | 0-20 mA |
| 4-20mA Application Support | Achievable Through PLC Program Scaling Within the 0-20mA Hardware Range |
| Output Overrange Capability | 5%, Up to Approximately 21 mA Minus 1 LSB |
| Full-Scale Current | 21 mA |
| Converter Resolution | 14-Bit |
| Output Resolution | 2.56348 µA per LSB |
| Conversion Method | R-2R Ladder |
| Nonlinearity | 0.05% |
| Output Load Resistance | 0-500 Ohms |
| Maximum Load Reactance | 100 µH |
| Step Response | 2.5 ms to 95% |
| Module Update Time | 512 µs for All Channels in Parallel |
| Current Output Coding | 0 to 32764 for 0 to Approximately 21 mA |
| SLC Communication Format | 16-Bit Two's Complement Binary |
| Overall Accuracy at 25°C | ±0.298% of Full Scale Maximum |
| Overall Accuracy at 0-60°C | ±0.541% of Full Scale Maximum |
| Overall Accuracy Drift | ±70 ppm/°C of Full Scale Maximum |
| Gain Error at 25°C | ±0.298% Maximum |
| Gain Error at 0-60°C | ±0.516% Maximum |
| Offset Error at 25°C | ±10 LSB Maximum |
| Offset Error at 0-60°C | ±12 LSB Maximum |
| Output Channel Isolation | Output Channels Are Not Individually Isolated |
| Field Wiring to Backplane Isolation | 500 VDC |
| Backplane Current Draw at 5VDC | 55 mA Maximum |
| Backplane Current Draw at 24VDC | 195 mA Maximum When Powered Through the Backplane |
| External Power Supply Option | 24 VDC, Selectable Using Module Switch SW1 |
| External Power Supply Voltage Tolerance | 21.6-26.4 VDC |
| External Power Supply Current Requirement | 195 mA Maximum |
| External Power Supply Requirement | Required for Certain SLC 500 Configurations; Verify Power Budget and Controller Type |
| Power Source Selection | Internal Backplane or External 24VDC via SW1 |
| Compatible Controller Platform | SLC 500 |
| Installation Location | Compatible Bulletin 1746 Chassis |
| Module Slot Usage | One Chassis I/O Slot |
| Module Interface | 1746 Backplane |
| Recommended Signal Cable | Shielded Belden 8761 or Equivalent |
| Maximum Field Wire Size | 14 AWG |
| Terminal Block | Removable |
| Calibration | Factory Calibrated |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5-95% Non-Condensing |
| Industrial Noise Immunity Reference | NEMA ICS 2-230 |
| Product Lifecycle Status | Discontinued |
| Discontinuation Date | April 29, 2021 |
| Manufacturer Replacement Classification | Engineering Replacement |
| Manufacturer Documentation | 1746-UM005 User Manual; 1746-IN008 Installation Instructions |
The Allen-Bradley 1746-NO4I provides four analog current output channels for SLC 500 control systems. It converts PLC output data into current signals for compatible industrial field devices such as drive reference inputs, valve positioners and process controllers.
The module provides a normal hardware output range of 0-20 mA. Applications requiring 4-20 mA can use suitable PLC program scaling to operate within that range. The output hardware is current-only and cannot be changed into a voltage output through configuration.
Its 14-bit converter provides a documented output resolution of 2.56348 µA per LSB, with a 2.5 ms step response to 95%. These characteristics support proportional control and analog setpoint generation in compatible industrial applications.
The 1746-NO4I can obtain its 24 VDC operating power from the compatible SLC backplane or a suitable external power supply, selected using switch SW1. External power is necessary in certain controller configurations and must satisfy the documented voltage tolerance.
The module occupies one compatible 1746 chassis I/O slot and communicates through the SLC backplane. A removable terminal block supports field wiring access for installation, inspection and maintenance.
The module provides a 0-500 ohm output load range, 500 VDC field-to-backplane isolation and a documented operating temperature of 0°C to 60°C. Its four current outputs share the module's analog circuitry and are not individually isolated from one another.
We support online purchase of the Allen-Bradley 1746-NO4I 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 Allen-Bradley 1746-NO4I?
Allen-Bradley 1746-NO4I is a four-channel analog current output module for the SLC 500 PLC platform. It provides current signals to compatible industrial field devices using a normal output range of 0-20 mA.
How many analog output channels does 1746-NO4I provide?
The module provides four analog current output channels. It does not include analog input channels and occupies one compatible SLC 500 I/O chassis slot.
What is the output signal range of 1746-NO4I?
The normal hardware output range is 0-20 mA, with a documented 5% overrange capability extending to approximately 21 mA. The module is designed for current output rather than voltage output applications.
Can 1746-NO4I be used for 4-20mA control applications?
Yes. A 4-20 mA operating span can be implemented through the PLC program's analog output scaling. This does not change the module's underlying 0-20 mA hardware range. Correct scaling and fault-response behavior should be verified before commissioning.
What is the difference between 1746-NO4I and 1746-NO4V?
The 1746-NO4I provides four analog current outputs with a normal 0-20 mA range. The 1746-NO4V provides four analog voltage outputs with a -10 to +10 VDC range. They have different output electronics and wiring requirements and are not direct signal-type substitutes.
What is the resolution of 1746-NO4I?
The current output converter has 14-bit resolution, corresponding to 2.56348 µA per LSB. The manufacturer also specifies a 2.5 ms step response to 95% and a 512 µs update time for all channels in parallel.
Does 1746-NO4I require an external 24VDC power supply?
The module can use compatible 24 VDC backplane power or a user-supplied external 24 VDC source selected by switch SW1. External power is required for certain configurations, including use with a fixed SLC 500 controller as described in the manufacturer manual. The external supply must provide 21.6-26.4 VDC with adequate current capacity.
What is the maximum output load resistance?
Rockwell Automation specifies an output load resistance range of 0-500 ohms and maximum load reactance of 100 µH. Field devices and loop wiring must remain within these limits.
Are the four analog output channels individually isolated?
No. The four output channels are not individually isolated. The module provides 500 VDC isolation between field wiring and the SLC backplane, which is different from channel-to-channel isolation.
Can 1746-NO4I be installed in an SLC 500 chassis?
Yes. The 1746-NO4I is designed for compatible Bulletin 1746 SLC 500 chassis installations. Before installation, confirm the available I/O slot, processor compatibility, power supply capacity, external power switch position and analog output addressing.
Has Allen-Bradley 1746-NO4I been discontinued?
Yes. Rockwell Automation lists the 1746-NO4I as discontinued effective April 29, 2021. Its replacement classification is Engineering Replacement, meaning a migration solution may require engineering changes rather than a direct module swap. Compatibility should be assessed against the existing PLC hardware and application.
What should be checked before ordering 1746-NO4I?
Verify the exact catalog number 1746-NO4I, four-channel current output configuration, 0-20 mA output range, 14-bit resolution, 0-500 ohm load limits, 1746 chassis compatibility, 5 VDC and 24 VDC backplane power requirements, SW1 power source selection, external 24 VDC supply requirements, existing terminal block, field wiring, program scaling and the manufacturer's discontinued product status. For an existing machine, also confirm the SLC 500 program backup and module slot configuration before replacement.
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| Brand | Allen-Bradley |
| Model Number | 1746-NO4I |
| Product Category | Analog Output Module |
| Product Family | SLC 500 |
| Product Bulletin | Bulletin 1746 |
| Module Type | Analog Current Output Module |
| Total Output Channels | 4 |
| Analog Input Channels | None |
| Output Signal Type | Analog Current |
| Normal Output Current Range | 0-20 mA |
| 4-20mA Application Support | Achievable Through PLC Program Scaling Within the 0-20mA Hardware Range |
| Output Overrange Capability | 5%, Up to Approximately 21 mA Minus 1 LSB |
| Full-Scale Current | 21 mA |
| Converter Resolution | 14-Bit |
| Output Resolution | 2.56348 µA per LSB |
| Conversion Method | R-2R Ladder |
| Nonlinearity | 0.05% |
| Output Load Resistance | 0-500 Ohms |
| Maximum Load Reactance | 100 µH |
| Step Response | 2.5 ms to 95% |
| Module Update Time | 512 µs for All Channels in Parallel |
| Current Output Coding | 0 to 32764 for 0 to Approximately 21 mA |
| SLC Communication Format | 16-Bit Two's Complement Binary |
| Overall Accuracy at 25°C | ±0.298% of Full Scale Maximum |
| Overall Accuracy at 0-60°C | ±0.541% of Full Scale Maximum |
| Overall Accuracy Drift | ±70 ppm/°C of Full Scale Maximum |
| Gain Error at 25°C | ±0.298% Maximum |
| Gain Error at 0-60°C | ±0.516% Maximum |
| Offset Error at 25°C | ±10 LSB Maximum |
| Offset Error at 0-60°C | ±12 LSB Maximum |
| Output Channel Isolation | Output Channels Are Not Individually Isolated |
| Field Wiring to Backplane Isolation | 500 VDC |
| Backplane Current Draw at 5VDC | 55 mA Maximum |
| Backplane Current Draw at 24VDC | 195 mA Maximum When Powered Through the Backplane |
| External Power Supply Option | 24 VDC, Selectable Using Module Switch SW1 |
| External Power Supply Voltage Tolerance | 21.6-26.4 VDC |
| External Power Supply Current Requirement | 195 mA Maximum |
| External Power Supply Requirement | Required for Certain SLC 500 Configurations; Verify Power Budget and Controller Type |
| Power Source Selection | Internal Backplane or External 24VDC via SW1 |
| Compatible Controller Platform | SLC 500 |
| Installation Location | Compatible Bulletin 1746 Chassis |
| Module Slot Usage | One Chassis I/O Slot |
| Module Interface | 1746 Backplane |
| Recommended Signal Cable | Shielded Belden 8761 or Equivalent |
| Maximum Field Wire Size | 14 AWG |
| Terminal Block | Removable |
| Calibration | Factory Calibrated |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5-95% Non-Condensing |
| Industrial Noise Immunity Reference | NEMA ICS 2-230 |
| Product Lifecycle Status | Discontinued |
| Discontinuation Date | April 29, 2021 |
| Manufacturer Replacement Classification | Engineering Replacement |
| Manufacturer Documentation | 1746-UM005 User Manual; 1746-IN008 Installation Instructions |
The Allen-Bradley 1746-NO4I provides four analog current output channels for SLC 500 control systems. It converts PLC output data into current signals for compatible industrial field devices such as drive reference inputs, valve positioners and process controllers.
The module provides a normal hardware output range of 0-20 mA. Applications requiring 4-20 mA can use suitable PLC program scaling to operate within that range. The output hardware is current-only and cannot be changed into a voltage output through configuration.
Its 14-bit converter provides a documented output resolution of 2.56348 µA per LSB, with a 2.5 ms step response to 95%. These characteristics support proportional control and analog setpoint generation in compatible industrial applications.
The 1746-NO4I can obtain its 24 VDC operating power from the compatible SLC backplane or a suitable external power supply, selected using switch SW1. External power is necessary in certain controller configurations and must satisfy the documented voltage tolerance.
The module occupies one compatible 1746 chassis I/O slot and communicates through the SLC backplane. A removable terminal block supports field wiring access for installation, inspection and maintenance.
The module provides a 0-500 ohm output load range, 500 VDC field-to-backplane isolation and a documented operating temperature of 0°C to 60°C. Its four current outputs share the module's analog circuitry and are not individually isolated from one another.
We support online purchase of the Allen-Bradley 1746-NO4I 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 Allen-Bradley 1746-NO4I?
Allen-Bradley 1746-NO4I is a four-channel analog current output module for the SLC 500 PLC platform. It provides current signals to compatible industrial field devices using a normal output range of 0-20 mA.
How many analog output channels does 1746-NO4I provide?
The module provides four analog current output channels. It does not include analog input channels and occupies one compatible SLC 500 I/O chassis slot.
What is the output signal range of 1746-NO4I?
The normal hardware output range is 0-20 mA, with a documented 5% overrange capability extending to approximately 21 mA. The module is designed for current output rather than voltage output applications.
Can 1746-NO4I be used for 4-20mA control applications?
Yes. A 4-20 mA operating span can be implemented through the PLC program's analog output scaling. This does not change the module's underlying 0-20 mA hardware range. Correct scaling and fault-response behavior should be verified before commissioning.
What is the difference between 1746-NO4I and 1746-NO4V?
The 1746-NO4I provides four analog current outputs with a normal 0-20 mA range. The 1746-NO4V provides four analog voltage outputs with a -10 to +10 VDC range. They have different output electronics and wiring requirements and are not direct signal-type substitutes.
What is the resolution of 1746-NO4I?
The current output converter has 14-bit resolution, corresponding to 2.56348 µA per LSB. The manufacturer also specifies a 2.5 ms step response to 95% and a 512 µs update time for all channels in parallel.
Does 1746-NO4I require an external 24VDC power supply?
The module can use compatible 24 VDC backplane power or a user-supplied external 24 VDC source selected by switch SW1. External power is required for certain configurations, including use with a fixed SLC 500 controller as described in the manufacturer manual. The external supply must provide 21.6-26.4 VDC with adequate current capacity.
What is the maximum output load resistance?
Rockwell Automation specifies an output load resistance range of 0-500 ohms and maximum load reactance of 100 µH. Field devices and loop wiring must remain within these limits.
Are the four analog output channels individually isolated?
No. The four output channels are not individually isolated. The module provides 500 VDC isolation between field wiring and the SLC backplane, which is different from channel-to-channel isolation.
Can 1746-NO4I be installed in an SLC 500 chassis?
Yes. The 1746-NO4I is designed for compatible Bulletin 1746 SLC 500 chassis installations. Before installation, confirm the available I/O slot, processor compatibility, power supply capacity, external power switch position and analog output addressing.
Has Allen-Bradley 1746-NO4I been discontinued?
Yes. Rockwell Automation lists the 1746-NO4I as discontinued effective April 29, 2021. Its replacement classification is Engineering Replacement, meaning a migration solution may require engineering changes rather than a direct module swap. Compatibility should be assessed against the existing PLC hardware and application.
What should be checked before ordering 1746-NO4I?
Verify the exact catalog number 1746-NO4I, four-channel current output configuration, 0-20 mA output range, 14-bit resolution, 0-500 ohm load limits, 1746 chassis compatibility, 5 VDC and 24 VDC backplane power requirements, SW1 power source selection, external 24 VDC supply requirements, existing terminal block, field wiring, program scaling and the manufacturer's discontinued product status. For an existing machine, also confirm the SLC 500 program backup and module slot configuration before replacement.
