Genuine Allen-Bradley 1746SC-NO8I SLC 500 - Industrial Automation Part

Allen-Bradley 1746SC-NO8I Analog Current Output Module | SLC 500

Description

Allen-Bradley 1746SC-NO8I Analog Current Output Module – SLC 500 Series

When an analog output module fails on a running production line, the consequences are immediate and costly: actuators lose their control signal, variable-frequency drives revert to fixed speed, and control valves snap to their fail-safe position. Within minutes, a batch process can be ruined, a packaging line halted, or a chemical dosing system thrown dangerously out of specification. The 1746SC-NO8I exists precisely to prevent that scenario — delivering eight independently configurable 4–20 mA current loop outputs with the signal integrity and isolation that continuous industrial processes demand.

Within the SLC 500 modular I/O family, the 1746SC-NO8I occupies the high-density analog output tier. Unlike the standard 1746-NO4I (4-channel) or voltage-output variants, this module provides eight current-output channels in a single slot, making it the preferred choice for installations where rack space is at a premium and loop-powered field devices — transmitters, positioners, and variable-speed drives — must be driven simultaneously. Its adoption across process industries in North America, Europe, and Asia reflects the long-term installed base of the SLC 500 platform and the continued demand for compatible spare and replacement modules.

Technical Specifications

Electrical

Output Channels: 8 (independently configurable)
Output Signal Range: 4–20 mA (current loop)
Resolution: 12-bit (1 in 4,096)
Accuracy: ±0.5% of full scale at 25 °C
Maximum Load Resistance: 750 Ω per channel
Isolation: Channel-to-backplane optical isolation
Backplane Current Draw: 5 V DC, 250 mA (typical)
External Power Supply: 24 V DC (user-supplied, field side)

Mechanical

Form Factor: Single-slot SLC 500 I/O module
Connector: 40-pin removable terminal block (RTB)
Dimensions: Standard SLC 500 module footprint
Weight: Approx. 200 g

Environmental

Operating Temperature: 0 °C to +60 °C
Storage Temperature: −40 °C to +85 °C
Relative Humidity: 5–95% non-condensing
Vibration: IEC 68-2-6 compliant
Shock: IEC 68-2-27 compliant

Certifications & Standards

UL Listed, CE Marked
Compliant with IEC 61131-2 (Programmable Controllers — Equipment Requirements)
RoHS compliant

Key Features & Benefits

8-Channel High Density — Consolidates eight 4–20 mA outputs into a single rack slot, reducing hardware cost by up to 50% compared to dual 4-channel modules and freeing slots for additional I/O expansion.
12-Bit Resolution — Provides 4,096 discrete steps across the 4–20 mA range, enabling fine-grained control of proportional valves and VFDs where ±0.5% accuracy is required by process specifications.
Channel-to-Backplane Optical Isolation — Eliminates ground loops between field wiring and the SLC 500 backplane, protecting the processor from transient voltages common in motor-drive environments.
Removable Terminal Block (RTB) — Allows field wiring to remain connected during module replacement, reducing maintenance downtime to under five minutes without rewiring.
IEC 61131-2 Compliant — Meets the international standard for PLC equipment requirements, ensuring compatibility with global project specifications and third-party system integrators.
Direct SLC 500 Backplane Compatibility — Plug-and-play installation in any SLC 500 fixed or modular chassis (1746-A4 through 1746-A13); no firmware update or special configuration file required.

Industry & Equipment Applications

Oil & Gas — Pipeline pressure control stations: driving electro-pneumatic positioners on control valves regulating flow rates in gathering and transmission systems.
Water & Wastewater Treatment — Dosing pump speed control and valve positioning in coagulation, filtration, and disinfection stages where precise chemical feed rates are mandated by regulatory standards.
Food & Beverage — Continuous cooking and pasteurization lines: modulating steam control valves and pump speeds to maintain ±0.5 °C temperature tolerances in CIP-compatible environments.
Automotive Manufacturing — Paint booth airflow and temperature control: coordinating multiple VFD-driven supply and exhaust fans via 4–20 mA speed references to maintain solvent concentration within explosion limits.
Pulp & Paper — Stock consistency control loops: adjusting dilution water valves and refiner gap actuators in response to consistency transmitter feedback in the wet end of paper machines.
Pharmaceutical — Bioreactor and fermentation vessel control: providing isolated analog outputs to agitator drives, pH dosing pumps, and dissolved oxygen control valves in GMP-regulated environments.

System Integration & Compatible Parts

Upstream (Processors & Chassis):

SLC 5/03, 5/04, 5/05 processors (1747-L531, 1747-L541, 1747-L551)
SLC 500 chassis: 1746-A4, 1746-A7, 1746-A10, 1746-A13
Power supplies: 1746-P1, 1746-P2, 1746-P4

Downstream (Field Devices):

Loop-powered 4–20 mA actuators, I/P transducers, and VFD analog inputs
HART-compatible field devices (passive HART communication via external HART multiplexer)

Equivalent / Replacement Modules:

1746-NO4I — 4-channel equivalent; use when only 4 outputs are required and an additional slot is available
1746-NO8V — 8-channel voltage output variant (0–10 V); substitute only when field devices accept voltage input — verify load impedance before replacement
1746-NO4V — 4-channel voltage output; not a direct replacement — confirm output type compatibility with field instrumentation before substitution

Our Quality Assurance Process

Every 1746SC-NO8I shipped from Konmask.com passes a four-stage inspection protocol:

Visual & Physical Inspection — Examination of PCB, terminal block, connector pins, and housing for damage, corrosion, or counterfeit indicators against OEM reference samples.
Functional Bench Test — Each channel is energized and output current verified across the 4–20 mA range using calibrated loop calibrators traceable to national standards.
Backplane Communication Test — Module is seated in a live SLC 500 chassis and scanned by an SLC 5/04 processor to confirm correct module ID, channel data table population, and fault-free operation.
Final Documentation & Packaging — Module is anti-static bagged, boxed with foam protection, and accompanied by a test report.

Available Documentation: Test report, photos of actual unit, certificate of conformance (on request), and DHL/FedEx tracking with insurance.

How to Order

Submit Your Inquiry — Use the contact form on this page or email support@konmask.com with your required quantity, destination country, and any urgency requirements.
Receive Quotation — Our team will respond within 24 hours with pricing, lead time, available stock quantity, and shipping options (DHL Express, FedEx International Priority, or sea freight for bulk orders).
Confirm & Ship — Upon order confirmation and payment, your module is tested, packed, and dispatched with full tracking. Export documentation (commercial invoice, packing list) is provided for customs clearance.

Why Choose Konmask.com?

Verified Stock, Not Broker Listings — We physically hold and test the modules we sell; you receive the exact unit inspected, not a drop-shipped unknown.
24-Hour Quotation Guarantee — Every inquiry receives a detailed response within one business day, including availability confirmation and firm pricing.
Global Export Experience — We ship to over 60 countries with full export documentation, DDP/DAP Incoterms support, and experience navigating customs requirements in the EU, Southeast Asia, and the Middle East.
Technical Pre-Sales Support — Our team can advise on compatibility, substitution conditions, and integration requirements before you commit to a purchase.
Transparent Traceability — Each shipment includes photos of the actual unit, serial number records, and a functional test report — documentation your maintenance team can file against the asset.

Frequently Asked Questions

Q: Is the 1746SC-NO8I compatible with all SLC 500 chassis and processors, including older SLC 5/01 and 5/02 systems?: A: The module is mechanically compatible with all SLC 500 chassis (1746-A4 through 1746-A13). However, full 12-bit resolution and channel-level diagnostics are best supported on SLC 5/03 and later processors. SLC 5/01 and 5/02 processors can address the module but may have limitations in data table depth — verify your processor’s I/O image size before installation in legacy systems.
Q: Can I replace a 1746-NO4I with a 1746SC-NO8I without modifying my RSLogix 500 program?: A: A direct slot-for-slot substitution will require updating the I/O configuration in RSLogix 500 to reflect the new module type and expanded channel count. Output file addresses will change. Plan for a controlled program modification and test cycle; this is not a transparent hot-swap replacement.
Q: What is the lead time for the Allen-Bradley 1746SC-NO8I and do you offer expedited shipping for urgent plant shutdowns?: A: Lead time depends on current stock levels — contact us for a real-time availability check. For urgent plant shutdown or emergency maintenance situations, we offer DHL Express Next-Day delivery to most major industrial regions. Notify us of your urgency when submitting your inquiry and we will prioritize your order accordingly.

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Allen-Bradley 1746SC-NO8I Analog Current Output Module | SLC 500