High-Speed Discrete Output Solution — Allen-Bradley 1756-OB16IEF | ControlLogix Fast Isolated Output
Where This Product Is Used
The Allen-Bradley 1756-OB16IEF is engineered for applications that demand precise, high-speed discrete output control with full channel-to-channel isolation. It is widely deployed across the following industrial environments:
- Automotive Assembly Lines — Synchronised actuation of servo drives, solenoid valves, and pneumatic cylinders where microsecond-level timing is critical.
- Packaging & Bottling Plants — High-cycle-rate output switching for labellers, fillers, and reject gates operating at line speeds exceeding 600 units/min.
- Semiconductor Fabrication — Isolated output control for cleanroom equipment, preventing ground-loop interference between sensitive process instruments.
- Oil & Gas Processing — Driving ESD (Emergency Shutdown) actuators and safety-rated solenoids in hazardous-area control panels.
- Power Generation & Utilities — Breaker control, relay driving, and load-shedding sequences in substation automation systems.
- Pharmaceutical Manufacturing — GMP-compliant batch control with isolated outputs ensuring signal integrity across multi-zone process equipment.
- Material Handling & Conveyors — Zone-by-zone conveyor start/stop, diverter gate control, and sortation system actuation.
Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1756-OB16IEF |
| Series / Platform | ControlLogix 1756 |
| Module Type | Fast Isolated Digital Output |
| Number of Output Points | 16 |
| Output Voltage Range | 10–31.2 V DC |
| Output Current per Point | 2 A continuous |
| Maximum Module Current | 8 A (all outputs ON) |
| Isolation | Channel-to-channel & channel-to-backplane isolated |
| Output Response Time (ON) | < 0.1 ms |
| Output Response Time (OFF) | < 0.1 ms |
| Scheduled Output Support | Yes — CST-based output scheduling |
| Diagnostic Features | Open-wire, short-circuit, over-temperature detection |
| Backplane Current (5 V DC) | 125 mA |
| Backplane Current (24 V DC) | 2 mA |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5–95% non-condensing |
| Wiring Style | Removable terminal block (RTB), 20-pin |
| Module Weight | Approx. 200 g |
| Enclosure Type | Open (must be installed in 1756 chassis) |
Why Engineers Specify This Model
- Sub-millisecond switching — <0.1 ms ON/OFF response enables precise motion coordination and time-critical interlock logic without relay bounce delays.
- Full channel isolation — Each output is independently isolated, eliminating cross-channel interference and protecting field devices from ground faults on adjacent channels.
- CST-scheduled outputs — Coordinated System Time (CST) scheduling allows outputs to fire at exact timestamps, enabling deterministic multi-axis synchronisation without PLC scan-time jitter.
- Comprehensive diagnostics — Real-time open-wire, short-circuit, and over-temperature fault detection reduces unplanned downtime and simplifies commissioning.
- Hot-swap capable — Modules can be replaced under power within a redundant ControlLogix chassis, supporting zero-downtime maintenance strategies.
- Scalable architecture — Slots seamlessly into any 1756 chassis (4-, 7-, 10-, 13-, or 17-slot) alongside existing ControlLogix I/O, communication, and motion modules.
Complete System Bill of Materials
A typical ControlLogix system incorporating the 1756-OB16IEF requires the following components:
| Catalog Number | Description | Role |
|---|---|---|
| 1756-OB16IEF | Fast Isolated Output Module (16-pt) | This module |
| 1756-L8x / 1756-L7x | ControlLogix 5580 / 5570 Controller | CPU / Logic Engine |
| 1756-A7 / 1756-A10 | ControlLogix Chassis (7- or 10-slot) | Backplane & housing |
| 1756-PA75 / 1756-PB75 | ControlLogix Power Supply (AC/DC) | Chassis power |
| 1756-EN2T / 1756-EN3TR | EtherNet/IP Communication Module | Network connectivity |
| 1756-IB16 / 1756-IB32 | ControlLogix Digital Input Module | Field input signals |
| 1492-CABLE016X | Pre-wired Cable for 1756 I/O | Field wiring harness |
| 1756-TBCH / 1756-TBS6H | Removable Terminal Block | Field termination |
Compliance & Industry Standards
- UL Listed — UL 508 (Industrial Control Equipment)
- CE Marked — EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- RoHS Compliant — Directive 2011/65/EU (restriction of hazardous substances)
- ATEX / IECEx — Suitable for use with approved barriers in Zone 2 / Class I Div 2 installations (verify with local authority)
- IEC 61131-2 — Programmable controller equipment standard
- ODVA EtherNet/IP Conformance — Interoperable within CIP-based network architectures
Quality Assurance & Sourcing
Konmask.com sources the 1756-OB16IEF exclusively through authorised distribution channels and verified industrial surplus networks. Every unit offered is subject to the following quality process:
- Visual & physical inspection — Enclosure integrity, label authenticity, connector condition, and firmware revision verification.
- Functional bench test — Output switching, diagnostic reporting, and backplane communication validated prior to dispatch.
- Serialisation check — Serial numbers cross-referenced against known counterfeit databases and Rockwell Automation product authentication resources.
- Secure anti-static packaging — Shipped in ESD-safe bags with foam cushioning and moisture-barrier outer cartons.
- Traceability documentation — Chain-of-custody records available upon request for regulated industries.
How to Source This Part
- Add to cart on this page and proceed to checkout — stock is allocated on a first-confirmed basis.
- Request a quote for volume orders (>5 units) or project-based procurement by emailing [email protected] with your BOM and required delivery date.
- Expedited sourcing — If the item shows as out of stock, contact us directly; we maintain relationships with multiple verified suppliers and can typically locate stock within 3–5 business days.
- Export & cross-border orders — We support international shipments with full commercial invoice, packing list, and HS code documentation (HS: 8537.10).
Application-Specific FAQ
Q: Can the 1756-OB16IEF be used in a SIL-rated safety application?
A: The standard 1756-OB16IEF is not SIL-rated. For functional safety applications, specify the 1756-OBV8EI (SIL 2 capable) or integrate with a GuardLogix safety controller and 1791DS safety I/O.
Q: What is the difference between 1756-OB16IEF and 1756-OB16E?
A: The IEF variant adds full channel-to-channel isolation and CST-based output scheduling. The standard OB16E shares a common output common rail and does not support scheduled outputs — critical distinctions for high-speed and multi-axis applications.
Q: Is this module compatible with Studio 5000 Logix Designer?
A: Yes. The 1756-OB16IEF is fully supported in Studio 5000 Logix Designer v21 and later. Add-On Profiles (AOPs) are available from Rockwell Automation’s Product Compatibility and Download Center (PCDC).
Q: Can outputs be individually configured for different load types?
A: Yes. Each of the 16 output points is independently configurable in the controller tag database, supporting mixed loads (solenoids, relays, LED indicators) on the same module.
Q: What happens to outputs during a controller fault or communication loss?
A: The module supports configurable fault states per output point — Hold Last State, Force ON, or Force OFF — ensuring safe process behaviour during controller faults or network interruptions.
Q: Do you provide a warranty on this module?
A: Yes. All units sourced through Konmask.com carry a 90-day functional warranty. Extended warranty and advance-replacement programmes are available for volume accounts — contact us for details.
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