Discrete Control Solution – Allen-Bradley 1756-OB32K | ControlLogix Series
Where This Product Is Used
The Allen-Bradley 1756-OB32K is a high-density 32-point digital output module engineered for demanding industrial discrete control applications. Engineers and system integrators specify this module across a wide range of industries:
- Automotive Assembly Lines – Controls solenoid valves, conveyor drives, and pneumatic actuators in body-in-white and powertrain assembly cells.
- Oil & Gas Processing – Drives shutdown valves, pump starters, and alarm annunciators in SIL-rated control panels.
- Food & Beverage Packaging – Manages filling machine actuators, labeling heads, and reject gates in high-speed packaging lines.
- Water & Wastewater Treatment – Controls pump motor starters, valve actuators, and blower drives in SCADA-integrated treatment plants.
- Pharmaceutical Manufacturing – Operates clean-room HVAC dampers, sterilization valves, and batch process actuators under FDA 21 CFR Part 11 environments.
- Material Handling & Logistics – Drives sorter diverters, conveyor zone controls, and dock leveler actuators in distribution centers.
Technical Specifications
| Part Number | 1756-OB32K |
| Brand | Allen-Bradley (Rockwell Automation) |
| Series | ControlLogix 1756 |
| Module Type | Digital Output (DO) |
| Number of Output Points | 32 Points |
| Output Voltage Range | 12/24V DC |
| Output Current per Point | 0.5 A (max) |
| Total Module Current | 8 A (max) |
| Output Type | Sourcing (PNP) |
| Isolation | Group isolated (8 points per group) |
| Backplane Current (5V DC) | 250 mA |
| Backplane Current (24V DC) | 3 mA |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| Storage Temperature | -40 to 85°C (-40 to 185°F) |
| Relative Humidity | 5 to 95% (non-condensing) |
| Wiring Type | Removable Terminal Block (RTB) |
| Compatible Chassis | 1756 ControlLogix Chassis (all sizes) |
| Weight | Approx. 500 g |
| Dimensions (H × W × D) | 94.0 × 94.5 × 58.4 mm |
Why Engineers Specify This Model
- High-Density I/O – 32 output points in a single ControlLogix slot reduces chassis footprint and wiring complexity versus lower-density alternatives.
- Group Isolation – 8-point group isolation allows mixed field-device voltage groups within a single module, simplifying panel design.
- Removable Terminal Block (RTB) – The -K suffix denotes a keyed RTB connector, enabling module replacement without rewiring — critical for minimizing downtime in production environments.
- Diagnostic Feedback – Per-point output fault detection and status reporting via the ControlLogix backplane enables rapid fault isolation.
- Seamless Studio 5000 Integration – Native Add-On Profile (AOP) support in Studio 5000 Logix Designer simplifies configuration and tag mapping.
- Proven Reliability – Designed to Rockwell Automation’s industrial-grade standards with MTBF ratings suitable for 24/7 continuous operation.
Complete System Bill of Materials
A typical ControlLogix discrete output system using the 1756-OB32K includes the following components:
- 1756-OB32K – 32-Point Digital Output Module (this item)
- 1756-TBCH / 1756-TBS6H – Compatible Removable Terminal Block (RTB)
- 1756-Lxx – ControlLogix L-Series Controller (e.g., 1756-L85E)
- 1756-Axx – ControlLogix Chassis (e.g., 1756-A10, 1756-A17)
- 1756-PAxx / 1756-PBxx – ControlLogix Power Supply
- 1756-EN2T / 1756-EN3TR – EtherNet/IP Communication Module
- 1492-IFM Series – Interface Modules for field wiring termination
Compliance & Industry Standards
- UL Listed (UL 508)
- CE Marked – EMC Directive 2014/30/EU & Low Voltage Directive 2014/35/EU
- RCM (C-Tick) Compliant
- ATEX / IECEx – Suitable for use in Zone 2 hazardous locations (with appropriate enclosure)
- IEC 61131-2 – Programmable Controllers Standard
- RoHS Compliant
Quality Assurance & Sourcing
At Konmask.com, every Allen-Bradley 1756-OB32K module is subject to a rigorous multi-point inspection process before shipment:
- Visual inspection for physical damage, corrosion, and counterfeit indicators
- Functional power-on verification and backplane communication test
- Firmware version verification against Rockwell Automation release notes
- Anti-static packaging with humidity indicator cards
- Full traceability documentation available upon request
We source from authorized distributors and verified surplus channels. All modules ship with a 90-day replacement warranty.
How to Source This Part
Ready to order the Allen-Bradley 1756-OB32K? Here’s how to get started:
- Request a Quote – Contact us at support@konmask.com or call +0086 19859288691 for volume pricing and lead time confirmation.
- Add to Cart – In-stock units ship within 1–3 business days via DHL, FedEx, or UPS Express.
- Bulk Orders – Special pricing available for orders of 5+ units. Mention your project requirements for a tailored BOM quote.
- Expedited Sourcing – Emergency procurement support available for plant-down situations. Contact us directly for priority handling.
Application-Specific FAQ
Q: Can the 1756-OB32K be used in a 1756-A4 (4-slot) chassis?
A: Yes. The 1756-OB32K is compatible with all standard ControlLogix 1756 chassis sizes, from 4-slot to 17-slot configurations.
Q: What is the difference between 1756-OB32 and 1756-OB32K?
A: The “-K” suffix indicates the module ships with a keyed Removable Terminal Block (RTB). The keying mechanism prevents incorrect RTB insertion during maintenance, reducing wiring errors.
Q: Is this module compatible with GuardLogix safety controllers?
A: The 1756-OB32K is a standard (non-safety) output module. For SIL 2/3 safety applications, specify the 1756-OBxxS series safety-rated output modules instead.
Q: What Studio 5000 version is required for the AOP?
A: The 1756-OB32K Add-On Profile is supported in Studio 5000 Logix Designer v21.00 and later. Always verify compatibility with your controller firmware revision.
Q: Can I mix 12V DC and 24V DC field devices on the same module?
A: Yes, within the group isolation structure (8 points per group). Each group can be powered independently, allowing mixed voltage field devices across groups.
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Contact: support@konmask.com | +0086 19859288691
