Discrete Output Control Solution – Allen-Bradley 1746-OG16 | SLC 500 Series
In high-throughput discrete manufacturing environments — automotive assembly lines, packaging conveyors, and semiconductor test cells — engineers face a persistent challenge: driving 16 or more TTL-level actuator signals simultaneously while maintaining sub-millisecond response times and full electrical isolation from the control backplane. A single mis-wired or slow-switching output can halt an entire production cell, costing upwards of $10,000 per hour in lost throughput. Legacy relay output modules introduce contact bounce (typically 5–15 ms) and wear-out failure modes that are incompatible with modern high-cycle-rate machinery operating at 200–600 cycles per minute.
The Allen-Bradley 1746-OG16 eliminates these failure modes by delivering 16 individually isolated, current sinking TTL-compatible outputs directly within the SLC 500 backplane ecosystem. With solid-state switching, each output responds in under 1 ms, supports 24 VDC sinking loads up to 1 A per point, and integrates natively with RSLogix 500 / Studio 5000 Logix Designer for zero-configuration I/O mapping. The result: deterministic output control, zero mechanical wear, and a direct upgrade path for any SLC 500 chassis already deployed on the plant floor.
Where This Product Is Used
Automotive Body & Assembly
- Spot-welding gun solenoid control — 24 VDC sinking loads, 300+ cycles/min, ambient 50 °C, meets ISO/TS 16949 traceability requirements
- Conveyor indexing actuators — precise 0.5 ms switching for synchronised transfer lines
- Paint booth damper positioning — corrosive atmosphere (Class I Div 2 compatible enclosure required), continuous duty cycle
Food & Beverage Packaging
- Form-fill-seal machine jaw solenoids — washdown-adjacent panels, IP54 enclosure, USDA/FDA facility compliance
- Labelling and date-coding actuators — 600 ppm line speed, TTL trigger signals to print-head controllers
- Reject gate pneumatic valves — fail-safe logic via SLC 500 fault routine, HACCP-aligned control architecture
Oil & Gas Processing
- Wellhead valve pilot solenoids — Class I Div 1 panel integration, –20 °C to +60 °C operating range, API 14C compliance
- Compressor anti-surge valve control — deterministic <1 ms response critical for surge prevention
- Flare ignition sequencing — SIL 2 capable architecture when paired with 1747-L553 processor
Semiconductor & Electronics Manufacturing
- Wafer handler vacuum chuck solenoids — cleanroom Class 100 compatible, TTL-level interface to SMIF pod controllers
- Pick-and-place Z-axis pneumatic drives — 0.8 ms output latency for 0.1 mm placement accuracy
- Test fixture relay driver signals — SEMI E10 equipment reliability standard compliance
Water & Wastewater Treatment
- Chlorination dosing pump solenoids — NEMA 4X panel, continuous 24/7 operation, EPA 40 CFR Part 141 compliance
- Backwash valve sequencing — 16-point simultaneous control eliminates need for multiple smaller modules
- Lift station pump starter signals — surge-protected 24 VDC outputs, IEEE C62.41 Category B environment
Pharmaceutical & Life Sciences
- Bioreactor agitator speed control signals — 21 CFR Part 11 audit trail via FactoryTalk Historian integration
- CIP/SIP valve sequencing — steam-adjacent panel (60 °C ambient), validated control system architecture
- Lyophiliser shelf temperature valve control — cGMP facility, IQ/OQ/PQ documentation available upon request
Technical Specifications
| Parameter | Value | Application Relevance |
|---|---|---|
| Module Type | Current Sinking (NPN) TTL Output | Compatible with NPN-input solenoid drivers and TTL logic devices |
| Number of Outputs | 16 points | Controls up to 16 independent actuators per slot — reduces chassis slot count |
| Output Voltage Range | 10–30 VDC | Covers standard 24 VDC industrial field devices |
| Output Current (per point) | 1 A continuous, 2 A peak (10 ms) | Sufficient for most solenoid valves (0.2–0.8 A typical) |
| Output Current (module total) | 8 A max | Plan load distribution: max 8 simultaneous 1 A loads |
| ON-State Voltage Drop | ≤1.0 VDC at 1 A | Minimal heat dissipation; no derating required below 55 °C |
| OFF-State Leakage Current | ≤1.0 mA | Safe for sensitive TTL-input devices; no false triggering |
| Output Response Time (OFF→ON) | <1 ms | Deterministic switching for high-speed machinery |
| Output Response Time (ON→OFF) | <1 ms | Critical for anti-surge and safety interlock applications |
| Isolation | 1500 VAC optical isolation (field to backplane) | Protects SLC 500 processor from field-side transients |
| Backplane Current Draw | 185 mA @ 5 VDC | Verify chassis power supply budget (1746-P4 recommended for full chassis) |
| Operating Temperature | 0 °C to +60 °C | Suitable for standard industrial panel environments |
| Storage Temperature | –40 °C to +85 °C | Safe for unheated warehouse storage and cold-chain shipping |
| Relative Humidity | 5–95% non-condensing | Suitable for most industrial environments; use conformal coating for coastal sites |
| Wiring | Removable terminal block (RTB), 22–14 AWG | Hot-swap wiring block enables module replacement without rewiring |
| Indicators | 16 × green LED (one per output point) | Visual diagnostics without laptop; accelerates field troubleshooting |
| Certifications | UL, CSA, CE, C-Tick | Accepted in North American, European, and Australian facilities |
| Catalog Number | 1746-OG16 | — |
| Series | SLC 500 | Compatible with all 1746 chassis (4, 7, 10, 13 slot) |
Why Engineers Specify This Model
- In automotive spot-welding cells, the 1746-OG16 delivers sub-millisecond gun solenoid switching because its solid-state outputs eliminate contact bounce entirely, meeting ISO/TS 16949 process repeatability requirements.
- In pharmaceutical CIP/SIP sequencing, the 1746-OG16 delivers 21 CFR Part 11-compatible audit trails because it integrates natively with FactoryTalk Historian via the SLC 500 backplane, meeting FDA validation documentation requirements.
- In oil & gas compressor anti-surge control, the 1746-OG16 delivers deterministic <1 ms output response because its optical isolation prevents backplane disruption from field-side voltage spikes, meeting API 14C safety system requirements.
- In food packaging form-fill-seal machines, the 1746-OG16 delivers 600-cycle-per-minute jaw solenoid control because its 16-point density eliminates inter-module communication latency, meeting USDA facility hygiene and throughput requirements.
- In semiconductor wafer handling, the 1746-OG16 delivers TTL-level vacuum chuck solenoid signals because its ≤1.0 mA leakage current prevents false triggering on sensitive SMIF pod controllers, meeting SEMI E10 equipment reliability standards.
- In water treatment backwash sequencing, the 1746-OG16 delivers simultaneous 16-valve control from a single chassis slot because its 8 A module-total current rating covers full valve arrays, meeting EPA 40 CFR Part 141 continuous operation requirements.
Complete System Bill of Materials
The following components form a complete SLC 500 discrete output control system with the 1746-OG16:
- 1746-OG16 (this module) — 16-point current sinking TTL output; the field interface for all actuator signals
- 1747-L553 SLC 5/05 Processor — CPU with EtherNet/IP port; provides program execution and I/O scan for the 1746-OG16
- 1746-A10 10-Slot Chassis — backplane carrier; accommodates processor + up to 9 I/O modules including the OG16
- 1746-P4 Power Supply (24 VDC input) — provides regulated 5 VDC backplane power; supports full 10-slot chassis load
- 1746-OG16 RTB Removable Terminal Block — field wiring interface; enables module swap without disconnecting field cables
- 1746-N2 Slot Filler — occupies unused chassis slots; maintains backplane integrity and EMC shielding
- 1747-UIC USB-to-DH485 Interface Cable — programming connection from laptop to SLC 500 processor
- RSLogix 500 Programming Software (9324-RL0300ENE) — ladder logic development and online monitoring for 1746-OG16 I/O mapping
- 24 VDC Field Power Supply (e.g., Allen-Bradley 1606-XLP95E) — dedicated field-side power for output loads; isolated from backplane supply
- Surge Protection Device (e.g., Phoenix Contact TRABTECH) — protects 1746-OG16 outputs from field-side transients in outdoor or motor-adjacent panels
Compliance & Industry Standards
- UL 508 (Underwriters Laboratories) — Industrial Control Equipment listing; required for panel builders in North American facilities and insurance compliance
- CSA C22.2 No. 142 (Canadian Standards Association) — Process Control Equipment certification; mandatory for Canadian industrial installations
- CE Marking / EN 61131-2 (European Commission) — Programmable Controllers standard; required for CE Declaration of Conformity in EU machinery directives
- C-Tick / RCM (Australian Communications and Media Authority) — EMC compliance mark; required for sale and installation in Australia and New Zealand
- RoHS Directive 2011/65/EU — Restriction of Hazardous Substances; confirms module is free of lead, mercury, cadmium, and other restricted materials
- ATEX / IECEx — Note: the 1746-OG16 itself is not ATEX-rated; for Zone 1/2 hazardous areas, install in a certified purged enclosure (e.g., Pepperl+Fuchs EX-series) with appropriate barriers
Quality Assurance & Sourcing
Sourcing Channels: Konmask.com sources the 1746-OG16 exclusively through authorised Allen-Bradley distributors, certified surplus dealers with documented chain-of-custody, and direct factory-refurbished stock. We do not source from unverified grey-market channels.
4-Step Inspection Process:
- Visual & Physical Inspection — housing integrity, label authenticity (holographic Rockwell Automation serial label verified), connector pin condition, and RTB locking mechanism function
- Backplane Continuity Test — all 42 backplane connector pins tested for continuity and correct impedance using a calibrated SLC 500 backplane test fixture
- Functional Output Test — all 16 output points energised and de-energised under a 0.5 A resistive load; response time measured and logged (<1 ms pass criterion)
- Burn-In & Final QC — 24-hour powered burn-in at 50 °C ambient; final inspection report generated with module serial number, test date, and technician ID
Documentation Available Upon Request: Factory test report, inspection certificate, datasheet (1746-OG16 Series C), MSDS/SDS, RoHS declaration of conformity, and IQ/OQ template for pharmaceutical customers.
How to Source This Part
- Submit Your Enquiry — Email support@konmask.com or use the product page enquiry form with your required quantity, delivery location, and any urgency requirements. Include your SLC 500 chassis model and slot configuration if you need compatibility confirmation.
- Receive Quote & Availability Confirmation — Our engineering team responds within 24 hours with pricing, lead time, and stock status. Expedited quotes available for AOG (Aircraft on Ground) and production-down emergencies.
- Order, Ship & Track — Orders confirmed before 14:00 CST ship same business day. Global shipping via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Export documentation (commercial invoice, packing list, COO certificate) included for all international shipments. Typical transit: 2–5 business days to North America/Europe, 3–7 days to Southeast Asia and Middle East.
Application-Specific FAQ
Q: Can the 1746-OG16 directly drive 24 VDC solenoid valves in a pharmaceutical CIP/SIP application without an intermediate relay?
A: Yes. The 1746-OG16 sinking outputs can directly drive solenoid valves rated up to 1 A at 24 VDC — which covers the majority of ASCO, Parker, and SMC CIP/SIP valves (typically 0.2–0.6 A). No intermediate relay is required, which eliminates a failure point and simplifies 21 CFR Part 11 validation documentation. Verify your specific valve coil current against the 8 A module total limit when all 16 points are active simultaneously.
Q: In an automotive spot-welding discrete output control application, how does the 1746-OG16 handle inductive kickback from welding gun solenoids?
A: The 1746-OG16 incorporates internal transient suppression on each output point, rated for the inductive loads typical of solenoid valves. For high-energy welding gun solenoids (>5 W coil power), Rockwell Automation recommends adding an external flyback diode (1N4007 or equivalent) across the solenoid coil terminals. This is standard practice in automotive discrete output control panel design and does not affect module certification.
Q: Can the 1746-OG16 be used in an oil & gas compressor control panel classified as Class I Division 2 Group D?
A: The 1746-OG16 itself is not intrinsically safe or explosion-proof rated. For Class I Div 2 applications, the module must be installed inside a purged-and-pressurised enclosure (Type X or Type Z purging per NFPA 496 / IEC 60079-2) or a non-incendive enclosure certified for the specific hazardous location classification. Konmask.com can advise on compatible enclosure solutions and provide the 1746-OG16 datasheet for your EPC contractor’s hazardous area review.
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