Industrial PLC Rack Power Solution — Allen-Bradley 1771-PS7 | PLC-5 Series
Where This Product Is Used
The Allen-Bradley 1771-PS7 is a dedicated power supply module engineered for the PLC-5 family I/O chassis (1771 series). It is deployed across a broad range of heavy-duty industrial environments where reliable, regulated DC power delivery to backplane-mounted I/O modules is mission-critical:
- Automotive Assembly Lines — Powers distributed I/O racks controlling welding stations, conveyor drives, and robotic end-effectors.
- Oil & Gas Processing Plants — Supplies stable backplane power in hazardous-area control panels managing valve actuators and flow instrumentation.
- Pulp & Paper Mills — Sustains continuous operation of process control racks in high-vibration, high-humidity environments.
- Water & Wastewater Treatment — Feeds I/O chassis in SCADA-integrated pump stations and filtration control systems.
- Food & Beverage Processing — Operates within washdown-adjacent control enclosures managing filling, capping, and packaging lines.
- Mining & Minerals Processing — Provides backplane power in remote, dust-laden environments with wide ambient temperature swings.
- Power Generation & Utilities — Integrated into legacy DCS/PLC hybrid architectures for turbine governor and excitation control panels.
Technical Specifications
| Part Number | 1771-PS7 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Family | PLC-5 / 1771 I/O Series |
| Module Type | Chassis Power Supply |
| Input Voltage | 120/240 VAC, 50/60 Hz (single-phase) |
| Output Voltage | +5 VDC (backplane logic), ±15 VDC (analog I/O) |
| Chassis Compatibility | 1771-A1B, 1771-A2B, 1771-A3B, 1771-A4B series |
| Slot Occupancy | Single slot, left-most position |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +85 °C |
| Relative Humidity | 5% to 95% non-condensing |
| Weight | 2.7 kg (approx.) |
| Agency Certifications | UL Listed, CE Marked, CSA Certified |
Why Engineers Specify This Model
- Proven Backplane Architecture — Designed natively for the 1771 chassis backplane; eliminates compatibility risk associated with third-party power supplies.
- Dual-Voltage Output — Simultaneously delivers +5 VDC for digital logic modules and ±15 VDC for analog signal conditioning modules from a single unit.
- Wide AC Input Range — Auto-selectable 120/240 VAC input simplifies global deployment and panel standardization.
- Thermal & Overcurrent Protection — Built-in protection circuits prevent cascade failures across the I/O rack during fault conditions.
- Drop-in Replacement — Maintains full backward compatibility with existing 1771 chassis installations, minimizing downtime during maintenance windows.
- Long Field Service Life — Robust construction supports extended MTBF in continuous-duty industrial environments.
Complete System Bill of Materials
For a fully operational PLC-5 I/O rack assembly, the following components are typically specified alongside the 1771-PS7:
- 1771-A4B — 16-slot I/O chassis (most common pairing)
- 1771-A3B — 12-slot I/O chassis (mid-density applications)
- 1785-Lxx — PLC-5 processor module (e.g., 1785-L40, 1785-L80)
- 1771-OBD — 16-point 24 VDC digital output module
- 1771-IBD — 16-point 24 VDC digital input module
- 1771-OFE — Analog output module (±10 VDC / 4–20 mA)
- 1771-IFE — Analog input module (±10 VDC / 4–20 mA)
- 1771-WB — Wiring arm / terminal block assembly
- 1784-KTX — DH+ / Remote I/O communication card
Contact support@konmask.com for bundle pricing on complete rack assemblies.
Compliance & Industry Standards
- UL 508 — Industrial Control Equipment (UL Listed)
- CSA C22.2 No. 142 — Process Control Equipment
- CE Marking — EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- RoHS — Compliant with EU Directive 2011/65/EU (verify lot-specific documentation)
- IEC 61131-2 — Programmable Controllers: Equipment Requirements and Tests
Quality Assurance & Sourcing
Konmask.com sources the 1771-PS7 through verified industrial automation distributors and authorized surplus channels. Every unit offered is subject to the following quality controls:
- Visual Inspection — Enclosure integrity, connector condition, label legibility, and absence of physical damage.
- Functional Verification — Output voltage rails tested under representative load conditions prior to dispatch.
- Traceability Documentation — Date codes, lot numbers, and sourcing chain records maintained per shipment.
- Packaging — Anti-static bagging with foam cushioning; outer carton rated for international freight.
- Warranty — 90-day operational warranty against defects in materials and workmanship. Extended warranty available on request.
How to Source This Part
- Add to Cart — Click the purchase button above to place an order directly through Konmask.com.
- Request a Quote — For quantities ≥ 3 units or urgent delivery requirements, email support@konmask.com with your required quantity and delivery timeline.
- Expedited Sourcing — If the item shows as out of stock, our procurement team can locate and qualify alternative 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).
- Phone / WhatsApp — Reach our technical sales team directly at +0086 19859288691 for same-day response.
Application-Specific FAQ
Q: Is the 1771-PS7 compatible with all 1771 chassis sizes?
A: Yes. It is compatible with the full range of 1771-Axx chassis (4-slot through 16-slot), always installed in the leftmost slot position.
Q: Can this power supply support a full 16-slot chassis loaded with analog modules?
A: The 1771-PS7 is rated for standard mixed-module loads. For chassis with a high density of analog I/O modules drawing ±15 VDC, verify total current draw against the module’s rated output capacity. Contact us for load calculation support.
Q: What is the difference between 1771-PS7 and 1771-P4S / 1771-P7?
A: The 1771-PS7 is a self-contained AC-input chassis power supply. The 1771-P4S and 1771-P7 are external power supply units that connect via cable. Selection depends on chassis model and enclosure layout.
Q: Do you supply the 1771-PS7 with a certificate of conformance?
A: Yes. A certificate of conformance (CoC) is available upon request at time of order. Specify your requirement in the order notes or contact us directly.
Q: Can I use this module to replace a failed power supply without reprogramming the PLC?
A: Yes. The 1771-PS7 is a passive power supply with no programmable parameters. Replacement requires only physical swap and power cycle — no PLC program changes are needed.
Q: What lead time should I expect?
A: In-stock units ship within 1–2 business days. For sourced units, typical lead time is 5–10 business days. Expedited options are available — contact us to discuss.
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