Discrete Control Solution – Allen-Bradley 1771-OM | 1771 I/O Series
Where This Product Is Used
The Allen-Bradley 1771-OM Digital Output Module is deployed across a wide range of industrial environments where reliable discrete output control is critical. Typical application scenarios include:
- Manufacturing & Assembly Lines — Controls solenoid valves, motor starters, and pilot lights in automotive body-shop and stamping operations.
- Oil & Gas Processing — Drives actuators and shutdown relays in wellhead control panels and pipeline SCADA systems.
- Water & Wastewater Treatment — Operates pump contactors, valve actuators, and alarm annunciators in municipal treatment facilities.
- Food & Beverage Processing — Interfaces with conveyor drives, filling machine solenoids, and reject gates in hygienic production environments.
- Power Generation & Utilities — Provides discrete switching for breaker control, load-shedding logic, and auxiliary relay panels.
- Material Handling & Warehousing — Coordinates sortation diverters, pallet-transfer stations, and zone-control outputs on conveyor systems.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1771-OM |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Series | PLC-5 / 1771 I/O |
| Module Type | Digital (Discrete) Output |
| Output Type | Relay / Isolated Contact |
| Number of Outputs | 8 (typical for 1771-OM) |
| Output Voltage Range | 24–240 V AC/DC |
| Output Current Rating | 2 A per point (resistive load) |
| Backplane Compatibility | 1771 I/O chassis (all sizes) |
| Isolation | Optical isolation between field and logic side |
| Indicators | Per-point LED status indicators |
| Weight | 100 g (approx.) |
| Operating Temperature | 0 °C to 60 °C |
| Relative Humidity | 5–95% non-condensing |
Note: Always verify specifications against the official Allen-Bradley 1771-OM product bulletin before final design. Contact Konmask for the latest datasheet.
Why Engineers Specify This Model
- Proven Field Reliability — The 1771 I/O platform has decades of installed-base history in mission-critical applications, making the 1771-OM a low-risk choice for brownfield upgrades and spare-parts programs.
- Universal AC/DC Compatibility — Relay contact outputs accept a wide voltage range, eliminating the need for separate AC and DC output modules in mixed-voltage panels.
- Hot-Swap Capable Chassis — When used in a 1771 chassis with appropriate PLC-5 firmware, modules can be replaced without full system shutdown, reducing maintenance downtime.
- Per-Point LED Diagnostics — Onboard status LEDs allow field technicians to verify output state without a laptop or HMI, accelerating fault isolation.
- Long-Term Spare Availability — Konmask maintains stock of legacy Allen-Bradley 1771 modules to support extended plant lifecycles beyond OEM production windows.
Complete System Bill of Materials
A typical PLC-5 discrete output subsystem using the 1771-OM includes the following components:
- 1771-OM — Digital Output Module (this item)
- 1771-A1B / A2B / A3B / A4B — 1771 I/O Chassis (4, 8, 12, or 16 slot)
- 1771-P4 / P7 — 1771 I/O Chassis Power Supply
- 1785-Lxx — PLC-5 Processor (e.g., 1785-L40E for Ethernet)
- 1771-WN — Keying Band Set (for slot keying)
- 1492-IFM series — Interface Modules / Terminal Blocks for field wiring
- 1770-XYC — Remote I/O Cable (if used in remote I/O configuration)
Contact support@konmask.com for a complete BOM quotation tailored to your application.
Compliance & Industry Standards
- UL Listed — Recognized under UL 508 (Industrial Control Equipment)
- CE Marked — Compliant with EU Low Voltage Directive and EMC Directive
- RoHS — Original Allen-Bradley production units comply with applicable RoHS directives
- ATEX / IECEx — Not rated for intrinsically safe or hazardous-area use in standard configuration; consult Konmask for barrier/isolator solutions
- IEC 61131-2 — Programmable controller I/O module standard
Quality Assurance & Sourcing
Konmask.com sources Allen-Bradley 1771-OM modules through authorized distribution channels and vetted secondary-market suppliers. Every unit offered undergoes the following before shipment:
- Visual inspection for physical damage, corrosion, and counterfeit indicators
- Functional power-on test where applicable
- Firmware / label verification against Allen-Bradley catalog records
- Anti-static packaging with humidity indicator card
- Certificate of conformance available on request
We stand behind every part. If a module does not perform as specified upon receipt, contact us within 30 days for a replacement or full refund.
How to Source This Part
- Add to Cart — Click the purchase button above to order online with secure checkout.
- Request a Quote — For volume orders (>5 units) or project BOM pricing, email support@konmask.com with your quantity and required delivery date.
- Expedited Sourcing — Need it urgently? Call or WhatsApp +0086 19859288691 for same-day stock confirmation and express shipping options.
- Cross-Reference — If you are unsure whether 1771-OM is the correct module for your chassis slot, share your existing module catalog number and we will confirm compatibility.
Application-Specific FAQ
Q: Is the 1771-OM compatible with both PLC-5 and SLC 500 systems?
A: The 1771-OM is designed for the 1771 I/O chassis used with PLC-5 processors. SLC 500 systems use a different 1746 I/O platform and are not compatible with 1771 modules.
Q: Can I use the 1771-OM to control 24 V DC loads directly?
A: Yes. The relay contact outputs are voltage-agnostic and can switch 24 V DC loads within the rated current limits. Ensure proper fusing on each output circuit.
Q: What is the typical lead time for the 1771-OM?
A: In-stock units ship within 1–3 business days. For out-of-stock situations, typical sourcing lead time is 5–15 business days depending on global availability.
Q: Do you provide a warranty on used or refurbished 1771-OM modules?
A: Yes. All modules sold by Konmask carry a minimum 90-day functional warranty. Extended warranty options are available — contact us for details.
Q: Can Konmask assist with migration from PLC-5 / 1771 to a modern ControlLogix platform?
A: Absolutely. We can supply both legacy 1771 spares to extend your current system life and recommend migration paths to 1756 ControlLogix I/O when you are ready to modernize.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
