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Allen Bradley 1746-NO8I SLC 500 Analog Input Module
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Product Introduction
The Allen-Bradley 1746-NO8I is an analog output module designed for the SLC 500 programmable controller platform. It provides precise current output signals for controlling field devices, making it suitable for applications requiring stable and accurate analog control.
This module features 8 analog output channels, each capable of delivering 0–20 mA current signals. It is typically used to drive actuators, control valves, variable frequency drives, and other process control equipment. The module converts digital values from the PLC into proportional current outputs, enabling smooth and continuous control of industrial processes.
With 16-bit resolution, the 1746-NO8I ensures high output accuracy and fine control granularity. Its plug-in connection design simplifies installation and maintenance, while its compatibility with the SLC 500 system allows easy integration into existing automation architectures.
Product Specifications
| Parameter | Description |
|---|---|
| Manufacturer | Allen-Bradley |
| Series | SLC 500 |
| Module Type | Analog Output Module |
| Catalog Number | 1746-NO8I |
| Number of Channels | 8 Outputs |
| Output Type | Current |
| Output Range | 0–20 mA |
| Resolution | 16-bit |
| Output Accuracy | ±0.3% of full scale (typical) |
| Load Range | Up to 500 Ω |
| Conversion Method | Digital-to-Analog Conversion |
| Update Time | Approx. 2.5 ms (all channels) |
| Backplane Current Consumption | Approx. 0.150 A |
| Isolation | No channel-to-channel isolation |
| Operating Temperature | 0 to 60°C |
| Connection Type | Plug-in terminal block |
| Installation | SLC 500 Chassis |
| Wiring Category | Category 1 |
| Dimensions | 144.5 × 34.6 × 130.18 mm |
| Weight | 0.25 kg |
Applications
● Process Control Systems
Used to output control signals to valves, dampers, and actuators requiring precise current regulation.
● Industrial Automation
Provides analog control signals for drives, controllers, and other field equipment in automated systems.
● Chemical and Petrochemical Industries
Ensures stable control of flow, pressure, and temperature through proportional current outputs.
● Power and Energy Systems
Applies to systems requiring controlled current signals for regulating power-related equipment.
● Machine Control Applications
Supports fine-tuned control of machinery where analog output precision is critical.
Advantages
● High-Precision Output Control
16-bit resolution allows fine adjustment of output signals, improving process accuracy.
● Stable Current Output
Provides consistent 0–20 mA signals suitable for industrial-grade control devices.
● Fast Response Time
Quick update rate ensures timely response in dynamic control systems.
● Simple Installation
Plug-in connection design reduces wiring complexity and maintenance time.
● Compact Integration
Fits directly into SLC 500 chassis without additional hardware requirements.
● Reliable Performance
Engineered for continuous operation in demanding industrial environments.
FAQ
- What type of signals does the 1746-NO8I output?
The module outputs analog current signals in the range of 0–20 mA, suitable for controlling industrial devices that require proportional current input. - Can the output range be adjusted to 4–20 mA?
Yes, the module can be configured through programming to operate within a 4–20 mA range by scaling the output values accordingly. - Is channel isolation provided in this module?
No, the module does not provide individual channel isolation. All outputs share a common reference, so proper grounding is essential. - What happens if the load exceeds the specified range?
If the load resistance exceeds the recommended limit, the module may not be able to maintain accurate current output, leading to signal distortion or reduced accuracy. - How does the module ensure output accuracy?
It uses high-resolution digital-to-analog conversion combined with internal calibration to maintain stable and precise output signals. - Can the module be used in closed-loop control systems?
Yes, it is suitable for closed-loop control applications where precise analog output is required for feedback-based control. - What wiring practices should be followed?
Shielded cables and proper grounding are recommended to minimize electrical noise and ensure stable output signals. - How fast does the module update its outputs?
The module updates all channels in approximately 2.5 ms, making it suitable for most industrial control applications. - Is external power required for the output signals?
The module sources current directly, but system design should ensure that load devices are within the specified electrical limits. - Can the module operate in harsh industrial environments?
Yes, it is designed for industrial use and operates reliably within the specified temperature range of 0 to 60°C.
Related Models
| Model | Description |
|---|---|
| 1746-NO4I | 4-Channel Analog Output Module |
| 1746-NIO4I | 2 In / 2 Out Analog Combo Module |
| 1746-NI8 | 8-Channel Analog Input Module |
| 1746-NI16V | 16-Channel Voltage Input Module |
| 1746-NT4 | Thermocouple Input Module |
| 1746-NR4 | RTD Input Module |
Popular Models
| Model | Description |
|---|---|
| 1747-L541 | SLC 5/04 Processor |
| 1747-L552 | SLC 5/05 Ethernet Processor |
| 1746-IA16 | 16-Channel AC Input Module |
| 1746-IB16 | 16-Channel DC Input Module |
| 1746-OW16 | 16-Channel Relay Output Module |
| 1746-P2 | Power Supply Module |
| Company Information | ||||||||
| [email protected] | ||||||||
| Mobile | +8613666033393 | |||||||
| +8613666033393 | ||||||||
| 13666033393 | ||||||||
| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
Excellent PLC Co., Ltd. has a large number of brand new and original PLC and DCS spare parts, with more than 60 cooperative countries. All products are guaranteed for 1 year and delivered to you by high-quality express. We are committed to using the best products and the most favorable prices to meet the needs and friendship of our customers. We have won the trust of thousands of customers, including these excellent customers.
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