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Allen-Bradley 1771-IAN – 16-Point AC Digital Input Module | PLC-5 1771 I/O Platform
Engineering Background: The Allen-Bradley 1771 I/O platform has been the backbone of discrete and process control architectures since the 1980s. Tens of thousands of PLC-5 systems remain in active service across manufacturing, utilities, oil & gas, and water treatment facilities worldwide. Sourcing verified, specification-compliant I/O modules is the single most critical factor in maintaining system uptime and avoiding costly unplanned shutdowns.
Product Positioning: The Allen-Bradley 1771-IAN (SKU: 1771-IAN) is a 16-point, 100–120V AC digital input module designed for direct installation in any 1771 I/O chassis. It serves as both a drop-in replacement for failed or end-of-life units and a new-build component for PLC-5 system expansions. Konmask.com maintains verified stock of 1771-IAN modules sourced from authorized distributors and OEM decommissions, with each unit inspected and bench-tested prior to shipment.
Complete Technical Specifications
- Part Number / SKU: 1771-IAN
- Manufacturer: Allen-Bradley / Rockwell Automation
- Module Type: Digital Input (AC), Discrete
- Number of Input Points: 16
- Input Voltage Range: 100–120V AC, 47–63 Hz
- Input Current (ON State): 10 mA minimum at 100V AC
- Input Impedance: ~10 kΩ at 60 Hz
- ON-State Voltage Threshold: 74–132V AC
- OFF-State Voltage Threshold: 0–20V AC
- OFF-State Leakage Current: 2.5 mA maximum
- Response Time: 10 ms max (ON); 10 ms max (OFF)
- Isolation: 1500V AC optical isolation (field-to-backplane)
- Backplane Current Draw: 800 mA @ 5V DC
- Operating Temperature: 0°C to +60°C (32°F to 140°F)
- Storage Temperature: −40°C to +85°C
- Relative Humidity: 5–95% non-condensing
- Module Keying: User-configurable hardware keying
- Chassis Compatibility: All 1771 I/O chassis (4-, 8-, 12-, 16-slot)
- Slot Width: Single-slot
- Wiring Arm: 1771-WN (40-pin), sold separately
- Weight: ~500 g
- Certifications: UL Listed, CE Marked, CSA Certified
- Catalog Series: Rockwell Automation 1771 I/O Platform
Proven Application Environments
- Discrete Manufacturing: Machine tool interlocking, assembly line start/stop, conveyor control
- Process Industries: Pump/valve status monitoring, level switch inputs, pressure switch feedback
- Utilities & Power: MCC status acquisition, breaker position feedback, switchgear monitoring
- Oil & Gas: Wellhead control panels, compressor station I/O expansion, ESD systems
- Water & Wastewater: Lift station monitoring, filter status, flow switch inputs
- Building Automation: HVAC control panels with legacy PLC-5 infrastructure
- Food & Beverage: Sanitary process lines with 120V AC field devices
Engineering Advantages
- Direct Drop-In Replacement: Identical form factor and backplane pinout — no wiring or chassis modification required
- 1500V AC Optical Isolation: Protects PLC-5 processor from field-side transients, ground loops, and common-mode noise
- Per-Point LED Status Indicators: Enables rapid field diagnostics without test equipment or laptop connection
- Hardware Keying: Prevents accidental installation of incorrect module type in multi-module chassis
- Wide Thermal Rating: +60°C continuous operation — suitable for non-air-conditioned panel enclosures
- Global Installed Base: Decades of field validation across every major industrial sector
- I/O Addressing Flexibility: Supports 1-slot, 2-slot, and 1/2-slot addressing modes
System Architecture & Signal Flow
The 1771-IAN occupies a single slot in any 1771 I/O chassis. Field wiring connects via the 1771-WN (40-pin) wiring arm. Each of the 16 AC input channels is optically isolated and scanned by the PLC-5 processor via the 1771 I/O chassis backplane. Input state data maps to the processor’s input image table at the configured rack/group/slot address.
Addressing Modes: Compatible with 1-slot, 2-slot, and 1/2-slot I/O addressing as configured in the PLC-5 I/O chassis setup.
Compatible Processors: PLC-5/11, PLC-5/20, PLC-5/30, PLC-5/40, PLC-5/60, PLC-5/80, and all PLC-5 variants supporting 1771 I/O.
ControlLogix Bridge Path: For ControlLogix integration, connect the 1771 I/O chassis via 1756-DHRIO or 1756-ENET bridge modules with appropriate I/O adapter configuration.
Sourcing & Quality Verification
- Source Channels: Authorized distributors, OEM decommissions, and verified surplus — no gray-market or unverified supply
- Inspection Protocol: Visual inspection, label verification, and functional bench testing on every unit prior to shipment
- Authenticity Screening: Verified against Rockwell Automation catalog specifications; counterfeit screening applied to all incoming stock
- Available Conditions: New surplus, refurbished, and factory-new — condition clearly stated at time of quotation
- Documentation: Original Rockwell Automation datasheets and installation instructions available upon request
- Warranty: 90-day functional warranty on all tested units; extended warranty available upon request
Procurement Process
- Confirm Part Number: Verify 1771-IAN against your chassis wiring arm and PLC-5 I/O configuration (voltage range: 100–120V AC)
- Request Quote: Contact Konmask.com with quantity, required condition, and lead time — response within 1 business day
- Order Confirmation: Receive proforma invoice with unit condition, serial number (if applicable), and warranty terms
- Shipment: ESD-safe packaging, insured international shipping with tracking; DDP/DAP Incoterms available
- After-Sales Support: Technical support for installation verification and I/O addressing configuration
Technical FAQ
Q: Is the 1771-IAN compatible with all 1771 I/O chassis sizes?
A: Yes. Compatible with 1771-A1B (4-slot), 1771-A2B (8-slot), 1771-A3B (12-slot), and 1771-A4B (16-slot).
Q: What wiring arm is required?
A: The 1771-WN (40-pin) wiring arm is the standard field wiring interface. Ensure the wiring arm keying matches the module.
Q: What is the difference between 1771-IAN and 1771-IAD?
A: 1771-IAN: 100–120V AC input. 1771-IAD: 200–240V AC input. Both are 16-point, single-slot modules with identical form factors.
Q: Can the 1771-IAN be used with ControlLogix or CompactLogix?
A: Not directly. For ControlLogix integration, use a 1756-DHRIO or 1756-ENET bridge module to connect the 1771 I/O chassis.
Q: Does Konmask.com provide a warranty?
A: Yes — 90-day functional warranty on all tested units. Extended warranty options available upon request.
Q: What is the backplane current draw of the 1771-IAN?
A: 800 mA at 5V DC. Verify your 1771 I/O chassis power supply budget before adding modules.
Q: Is same-day shipping available?
A: Subject to stock availability and order confirmation time. Contact Konmask.com for current lead times.
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Original Source: https://Konmask.com
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