Allen-Bradley 1756-OB32 — 32-Point Sourcing Digital Output Module | ControlLogix 1756 Platform
Engineering Background: The 1756-OB32 is a high-density sourcing digital output module designed for Rockwell Automation’s ControlLogix chassis-based control architecture. It delivers deterministic, high-speed discrete output switching for demanding industrial environments where I/O density, signal integrity, and system uptime are non-negotiable.
Product Positioning: Targeted at process automation, machine control, and safety-adjacent applications, the 1756-OB32 is the preferred choice for procurement engineers consolidating output channels without sacrificing per-point diagnostics or backplane bandwidth. It is fully compatible with the 1756 ControlLogix and GuardLogix chassis ecosystem.
Complete Technical Specifications
- Catalog Number: 1756-OB32
- Series: ControlLogix 1756
- Module Type: Digital Output, Sourcing (PNP)
- Number of Output Points: 32
- Output Voltage Range: 10–31.2V DC (nominal 12/24V DC)
- Output Current per Point: 1 A continuous
- Maximum Load Current (module): 10 A @ 30°C; 4 A @ 60°C
- Output Delay (OFF→ON): ≤ 0.5 ms
- Output Delay (ON→OFF): ≤ 2 ms
- Backplane Current (5V DC): 290 mA
- Backplane Current (24V DC): 3 mA
- Power Dissipation (max): 5.8 W
- Isolation: 100V DC continuous, group isolated (8 points/group)
- Operating Temperature: 0–60°C (32–140°F)
- Storage Temperature: -40–85°C
- Relative Humidity: 5–95% non-condensing
- Wiring: RTB (Removable Terminal Block), 20-pin, cage clamp
- Wire Gauge: 14–22 AWG
- Dimensions (H × W × D): 94.0 × 94.5 × 58.5 mm
- Weight: 350 g (approx.)
- Certifications: UL, CE, C-Tick, ATEX Zone 2
- Firmware: Field-upgradeable via RSLogix 5000 / Studio 5000
Proven Application Environments
- Automotive assembly line actuator and solenoid valve control
- Oil & gas wellhead and pipeline valve sequencing
- Pharmaceutical batch process discrete output control
- Water/wastewater pump and valve station automation
- Food & beverage conveyor and packaging line control
- Power generation auxiliary equipment switching
- Mining conveyor and crusher control panels
- Building automation and HVAC damper/actuator control
Engineering Advantages
- High I/O Density: 32 sourcing outputs in a single 1756 slot — maximizes chassis utilization and reduces per-point cost.
- Per-Point Diagnostics: Individual output fault detection and status reporting via the backplane — enables predictive maintenance without field wiring changes.
- Group Isolation: 8-point group isolation (100V DC) protects the backplane and adjacent modules from field-side faults.
- Removable Terminal Block (RTB): Pre-wired RTB allows module hot-swap without disconnecting field wiring — critical for high-availability systems.
- Producer/Consumer Model: Native ControlLogix backplane multicast — output data is produced once and consumed by multiple controllers simultaneously.
- Studio 5000 Integration: Full Add-On Profile (AOP) support for drag-and-drop configuration, tag-based programming, and online editing.
System Architecture & Signal Flow
The 1756-OB32 resides in any slot of a 1756 ControlLogix chassis and communicates via the proprietary ControlBus backplane at up to 100 Mbps. The controller (e.g., 1756-L8x) writes output data to the module’s output image table each scan. The module’s ASIC latches the output state and drives the field-side transistors within ≤0.5 ms. Field devices (solenoids, relays, indicator lamps) connect to the 20-pin RTB. Each 8-point group shares a common return (COM) terminal, allowing mixed 12V/24V DC field devices across groups within the same module.
Recommended Companion Modules:
- 1756-IB32 — 32-point 24V DC sourcing digital input (matched I/O pair)
- 1756-TBCH — 20-pin cage clamp RTB (field wiring interface)
- 1756-TBS6H — Screw clamp RTB alternative
- 1756-L85E / 1756-L84E — ControlLogix 5580 controllers (recommended pairing)
Sourcing & Quality Verification
- Stock Condition: Genuine surplus / refurbished — each unit inspected prior to listing.
- Authenticity: Catalog label, series letter, and firmware revision verified against Rockwell Automation documentation.
- Functional Testing: Output switching, backplane communication, and LED diagnostics verified where applicable.
- Packaging: ESD-safe anti-static bag + foam-lined carton; RTB included unless noted.
- Traceability: Serial number and firmware revision documented per shipment on request.
- Warranty: 90-day Konmask operational warranty; DOA replacement within 7 days of receipt.
Procurement Process
- Confirm Compatibility: Verify chassis series (A–E), firmware revision, and RTB type with your system integrator or Rockwell documentation (Publication 1756-TD002).
- Request Quote: Contact support@konmask.com or call +0086 19859288691 for volume pricing, lead time, and availability confirmation.
- Place Order: Purchase directly via this listing or submit a PO — Net 30 available for qualified accounts.
- Receive & Inspect: Inspect upon receipt; report any discrepancy within 48 hours for priority resolution.
- Install & Commission: Follow Rockwell Publication 1756-IN572 installation instructions; use Studio 5000 AOP for configuration.
Technical FAQ
Q: Is the 1756-OB32 compatible with both ControlLogix and GuardLogix chassis?
A: Yes. The 1756-OB32 is compatible with all 1756 ControlLogix and GuardLogix chassis (Series A–E). It is not a safety-rated module and cannot be used as a safety output in a GuardLogix safety task.
Q: Can I mix 12V and 24V DC field devices on the same module?
A: Yes, within separate 8-point groups. Each group has its own COM terminal, so different supply voltages can be used across groups as long as each group’s devices share the same voltage.
Q: Does the module support electronic fusing or short-circuit protection?
A: The 1756-OB32 does not include electronic fusing. External fusing per group (per Rockwell wiring guidelines) is required to protect field wiring and the module’s output transistors.
Q: What is the maximum number of 1756-OB32 modules per chassis?
A: Limited by chassis slot count and total backplane current budget. Consult the 1756 ControlLogix System Power Requirements tool (Rockwell Publication 1756-TD005) for your specific configuration.
Q: Is an RTB included with this listing?
A: RTB inclusion is noted in the product condition description. If not specified, please confirm with our team before ordering.
Q: Can Konmask provide a Certificate of Conformance or test report?
A: Yes, upon request for qualified orders. Contact support@konmask.com with your order reference.
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