Process Control & Analog Signal Isolation Solution — Allen-Bradley 1746SC-IN04VI | SLC 500 Series
Where This Product Is Used
The Allen-Bradley 1746SC-IN04VI is a 4-channel isolated analog output module engineered for demanding process control environments where signal integrity and ground-loop elimination are critical. Engineers specify this module across a wide range of industrial applications:
- Chemical & Petrochemical Plants — Driving control valves and positioners with isolated 4–20 mA signals to prevent ground loops across hazardous-area barriers.
- Water & Wastewater Treatment — Controlling variable-speed pump drives and dosing systems requiring galvanically isolated analog outputs.
- Oil & Gas Upstream/Midstream — Interfacing SLC 500 controllers with field instruments across long cable runs where common-mode noise is prevalent.
- Pharmaceutical Manufacturing — Providing precise ±10 V or 4–20 mA setpoints to temperature controllers, mass flow controllers, and pressure regulators in GMP environments.
- Power Generation & Utilities — Issuing isolated analog commands to AVRs, governor controllers, and load-sharing modules.
- Food & Beverage Processing — Controlling proportional valves and variable-frequency drives in washdown environments where electrical isolation protects sensitive instrumentation.
- Pulp & Paper Mills — Managing tension control and web-speed references with noise-immune isolated outputs.
- HVAC & Building Automation — Sending isolated setpoints to chillers, AHUs, and VAV controllers integrated into SLC 500-based BAS architectures.
Technical Specifications
| Part Number | 1746SC-IN04VI |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Series | SLC 500 / 1746 I/O |
| Module Type | Isolated Analog Output |
| Number of Channels | 4 (individually isolated) |
| Output Signal Types | Voltage: ±10 V DC | Current: 4–20 mA |
| Resolution | 12-bit (1 in 4,096) |
| Isolation Voltage | Channel-to-channel & channel-to-backplane isolation |
| Update Rate | Synchronous with SLC 500 scan cycle |
| Power Consumption | Supplied via SLC 500 backplane (1746 series) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5–95% non-condensing |
| Backplane Compatibility | All 1746 SLC 500 chassis (4, 7, 10, 13-slot) |
| Weight | 200 g (approx.) |
| Certifications | UL, CE, cUL |
Why Engineers Specify This Model
- True Channel-to-Channel Isolation — Eliminates ground loops that corrupt analog signals in multi-instrument loops, a common failure mode in legacy 1746-NO4I non-isolated modules.
- Dual Output Mode Flexibility — Each channel is software-configurable for either voltage (±10 V) or current (4–20 mA) output, reducing spare-parts inventory and simplifying panel design.
- Drop-in SLC 500 Compatibility — Slots directly into any 1746 chassis without additional hardware; configured via RSLogix 500 / Studio 5000 Logix Designer using standard ladder logic.
- High-Noise Immunity — Isolated design withstands common-mode voltages and EMI/RFI interference typical of motor-drive-heavy environments.
- Proven Field Reliability — Rockwell Automation’s SLC 500 platform has decades of installed base in continuous-process industries; the SC-series isolated modules are the preferred upgrade path for noise-sensitive loops.
- Simplified Wiring — Individual channel isolation eliminates the need for external signal isolators or loop-powered isolator barriers, reducing panel footprint and wiring cost.
Complete System Bill of Materials
For a fully operational SLC 500 analog output system using the 1746SC-IN04VI, the following components are typically required:
- 1746SC-IN04VI — This module (4-ch isolated analog output)
- 1746-A4 / A7 / A10 / A13 — SLC 500 chassis (4, 7, 10, or 13-slot)
- 1746-P1 / P2 / P3 / P4 — SLC 500 power supply (120/240 VAC or 24 VDC input)
- 1747-L40 / L541 / L551 / L553 — SLC 5/04 or 5/05 processor (recommended for Ethernet connectivity)
- 1747-UIC — USB-to-DH-485 interface cable for programming
- 1746-NO4I — Non-isolated analog output module (alternative, lower-cost option for non-critical loops)
- Field Wiring Terminals — Shielded twisted-pair cable (Belden 8761 or equivalent) for analog signal runs
- RSLogix 500 / Studio 5000 — Programming software (Rockwell Automation license required)
Compliance & Industry Standards
- UL Listed — UL 508 (Industrial Control Equipment)
- CE Marked — EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- cUL — Canadian Standards compliance
- RoHS Compliant — Restriction of Hazardous Substances Directive 2011/65/EU
- ATEX / IECEx — Not rated for Zone 0/1 hazardous areas; use certified barriers for Ex-zone installations
- ISA-5.1 — Signal ranges conform to ISA instrumentation standards (4–20 mA, ±10 V)
- IEC 61131-2 — Programmable controller I/O module standard
Quality Assurance & Sourcing
Konmask.com sources the 1746SC-IN04VI through verified industrial automation distributors and authorized channel partners. Every unit offered on this platform undergoes the following quality process:
- Visual Inspection — Enclosure, label, and connector integrity verified against OEM specifications.
- Authenticity Verification — Part markings, date codes, and firmware revisions cross-referenced with Rockwell Automation documentation.
- Functional Test (where applicable) — Refurbished or surplus units are bench-tested for output accuracy and isolation integrity prior to listing.
- Secure Packaging — Anti-static packaging with moisture barrier and shock-absorbing foam for international shipment.
- Traceability — Lot and serial number records maintained for warranty and compliance documentation.
New, surplus-new, and tested-refurbished conditions are clearly indicated on each listing. Contact us to confirm current stock condition and revision level.
How to Source This Part
- Submit a Quote Request — Email support@konmask.com with your required quantity, delivery timeline, and preferred condition (new / surplus / refurbished).
- Receive Availability & Pricing — Our team responds within 1 business day with stock status, unit price (HKD/USD), and lead time.
- Confirm Order & Payment — Orders accepted via T/T bank transfer, PayPal, or other agreed methods. Pro-forma invoice issued upon confirmation.
- Shipping & Tracking — Dispatched via DHL / FedEx / SF Express with full tracking. Export documentation (commercial invoice, packing list, COO) provided for customs clearance.
- After-Sales Support — Technical assistance available for installation, RSLogix 500 configuration, and system integration questions.
Application-Specific FAQ
Q: Can the 1746SC-IN04VI replace a standard 1746-NO4I in an existing SLC 500 rack?
A: Yes. The 1746SC-IN04VI is a direct slot-compatible replacement. You will need to update the I/O configuration in RSLogix 500 to reflect the new module type and reconfigure channel output modes as required.
Q: Is each channel independently isolated, or is it a single isolated group?
A: Each of the 4 channels is individually isolated from all other channels and from the backplane, providing true channel-to-channel isolation. This is the key differentiator from the standard 1746-NO4I.
Q: What is the maximum cable length for the 4–20 mA output?
A: With shielded twisted-pair cable and a loop resistance within the module’s compliance voltage specification, cable runs of 300–500 m are typical in industrial installations. Verify total loop resistance against the module’s output compliance voltage rating.
Q: Can this module be used in a SLC 5/01 or 5/02 processor system?
A: The 1746SC-IN04VI is compatible with all SLC 500 processors (5/01 through 5/05) as it communicates via the standard 1746 backplane I/O protocol. However, advanced diagnostic features may require a 5/04 or 5/05 processor.
Q: Do you supply the RSLogix 500 configuration file or Add-On Profile (AOP)?
A: We can provide application notes and point you to Rockwell Automation’s official product profile. Contact our technical team for assistance with module configuration in your specific application.
Q: What is the typical lead time for this part?
A: Lead time depends on current stock condition. In-stock surplus units typically ship within 2–5 business days. New factory-order units may require 4–12 weeks. Contact us for real-time availability.
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