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Allen-Bradley 1756sc-OF8H ControlLogix HART Output Module
Allen-Bradley 1756sc-OF8H ControlLogix HART Output Module
Brand/Manufacturer: Allen-Bradley
Order Number: 1756sc-OF8H
Type: Analog Output HART Modules
Country of Origin: Sweden
Condition: Original Brand
Lead Time: Available in stock
Payment Term: 100% TT In Advance
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Description
The 1756sc-OF8H is an 8-channel analog output module engineered by Spectrum Controls for seamless integration into Rockwell Automation Allen-Bradley ControlLogix chassis. It provides high-density current and voltage signal generation combined with Highway Addressable Remote Transducer (HART) digital protocol pass-through. This module allows process control architectures to transmit 4-20 mA control signals to field actuators while simultaneously communicating bi-directional HART digital data to intelligent field devices without requiring external multiplexers.
Signal Conditioning and High-Density Output Architecture
The module features 8 single-ended output channels operating across standard industrial current ranges of 0-20 mA and 4-20 mA, as well as bipolar voltage ranges of ±10 VDC. Operating with a 15-bit resolution DAC, the 1756sc-OF8H delivers precise loop control for control valves, variable frequency drives, and positioners. Each channel supports continuous open-circuit detection in current mode and electronic short-circuit protection limited to 21 mA or less.
Power is drawn directly from the ControlLogix backplane, requiring 150 mA at 5.1 VDC and 210 mA at 24 VDC, resulting in a maximum backplane power consumption of 5.8 W. Channel-to-backplane isolation is rated at 250 VAC continuous reinforced insulation, ensuring signal integrity and system protection against high ground-potential differences. Field wiring connects via a standard 20-pin Removable Terminal Block (RTB), such as the 1756-TBNH or 1756-TBSH.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1756sc-OF8H |
| Brand | Spectrum Controls / Allen-Bradley |
| Product Type | Analog Output HART Modules |
| Number of Outputs | 8 single-ended channels |
| Output Signal Ranges | 0…20 mA, 4…20 mA, ±10 VDC |
| Resolution | 15 bits across range |
| Backplane Current Draw | 150 mA @ 5.1 VDC, 210 mA @ 24 VDC |
| Total Backplane Power | 5.8 W |
| Current Load Drive | 0…750 ohms |
| Voltage Load Drive | > 2000 ohms |
| Settling Time | < 2 ms to 95% of final value |
| Isolation Voltage | 250 V continuous (channel-to-backplane) |
| Required Terminal Block | 20-Pin (1756-TBNH or 1756-TBSH) |
Removable Terminal Block Options
To connect field-side wiring to the 1756sc-OF8H, a 20-pin Removable Terminal Block (RTB) must be purchased separately. Rockwell Automation provides two housing variants: standard cage-clamp terminals (1756-TBNH or spring-clamp terminals (1756-TBSH. Mechanical keying prevents insertion into incorrect chassis slots.
Frequently Asked Questions
Q: Does the 1756sc-OF8H support HART protocol pass-through on all 8 channels?A: Yes, the module incorporates dedicated HART modems per channel, allowing simultaneous transmission of analog output signals and digital HART device variable management across all 8 channels.
Q: Is external power required for the 1756sc-OF8H module operation?A: No, the module receives all required operating power directly from the ControlLogix backplane bus rails (5.1 VDC and 24 VDC).
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Testimonials
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- Sarah Johnson
We’ve worked with IndustriaX Limited on several urgent orders for automation components. Their ability to provide original, factory-sealed parts with full documentation—often from in-stock inventory—has significantly reduced our downtime. The delivery is consistently fast, and their logistics team is highly responsive. IndustriaX has become one of our most trusted global suppliers for industrial spare parts.
- Sarah Johnson
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Finding authentic automation parts has always been a challenge, especially for discontinued models. IndustriaX Limited has impressed us with their genuine stock, clear product traceability, and prompt updates. We’ve verified their shipments against OEM specs multiple times, and the results are flawless. They’re now our preferred sourcing partner for critical systems.
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Finding authentic automation parts has always been a challenge, especially for discontinued models. IndustriaX Limited has impressed us with their genuine stock, clear product traceability, and prompt updates. We’ve verified their shipments against OEM specs multiple times, and the results are flawless. They’re now our preferred sourcing partner for critical systems.
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Professional Service with After-Sales Support"IndustriaX Limited doesn’t just ship products—they provide solutions. When we encountered installation issues with one of the modules, their technical team replied in less than 4 hours and provided wiring guides and troubleshooting tips. This level of post-sale support is rare in the spare parts sector. Their professionalism gives us confidence in every order."
- Emily Brown
"IndustriaX Limited doesn’t just ship products—they provide solutions. When we encountered installation issues with one of the modules, their technical team replied in less than 4 hours and provided wiring guides and troubleshooting tips. This level of post-sale support is rare in the spare parts sector. Their professionalism gives us confidence in every order."
- Emily Brown
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We've tested multiple suppliers over the years, but IndustriaX Limited consistently stands out. Their product catalog is extensive, their team is knowledgeable, and they understand the urgency of industrial needs. With every order, we receive timely updates, fast delivery, and 100% genuine products. It’s rare to find such consistency and reliability in this field.
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We've tested multiple suppliers over the years, but IndustriaX Limited consistently stands out. Their product catalog is extensive, their team is knowledgeable, and they understand the urgency of industrial needs. With every order, we receive timely updates, fast delivery, and 100% genuine products. It’s rare to find such consistency and reliability in this field.
- Michael Anderson