Product Overview: Allen Bradley 1771-IA2 PLC 5 Digital Input Module
The 1771-IA2 is an 8-channel digital input module for the PLC 5 platform. It converts 120V AC/DC field signals into logic levels for the processor. This module directly controls data table bits. It works with pushbuttons, limit switches, and proximity sensors. Its design includes optoelectrical isolation and input filtering for electrical noise reduction.
Key Technical Specifications
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Part Number | 1771-IA2 |
| Series | PLC 5 Digital Input Module |
| Voltage Rating | 120V AC/DC (Operating: 87-138V AC / 97-138V DC) |
| Number of Inputs | 8 (isolated) |
| Backplane Current | 75 mA |
| Max Off-State Current | 2.8 mA (AC/DC) |
| Signal Delay (AC On/Off) | 24 ms ±10 ms |
| Signal Delay (DC On) | 10 ms ±4 ms |
| Signal Delay (DC Off) | 20 ms ±9 ms |
| Power Dissipation | 10.7 W (36.5 BTU/hr) |
| Dimensions | 3.5 x 6.5 x 2.0 in (89 x 165 x 51 mm) |
| Wiring Arm | 1771-WA (included) |
Installation & Compatibility
- Chassis: Fits any 1771 I/O chassis with PLC processor.
- Addressing: Supports ½, 1, and 2-slot I/O addressing.
- Keying: Upper between pins 10-12; lower between pins 4-6.
- Wiring: Use 1771-WA wiring arm – no need to disconnect wires during replacement.
- Isolation: Optoelectrical isolation protects against transients.
- Filtering: Built-in input filter reduces electrical noise.
Diagnostics & Status Indication
- 8 orange status LEDs on front panel show field-side input status.
- Quick visual check of each channel’s on/off state.
- No additional diagnostic software needed for basic monitoring.
Typical Applications
- AC/DC proximity switches
- Pushbuttons and selector switches
- Limit switches and pilot lights
- Motor starter auxiliary contacts
- Annunciators and on/off actuators
Environmental & Reliability
- Temperature range: 0 to 60 °C (operating)
- Storage temperature: -40 to 85 °C
- Humidity: 5-95% non-condensing
- Shock/Vibration: Meets industrial automation standards
- Noise immunity: High common-mode rejection
Certifications & Compliance
- UL Listed, CSA Certified
- CE Marked (for European compliance)
- RoHS Compliant
Package Contents
- 1 x 1771-IA2 Digital Input Module
- 1 x 1771-WA Wiring Arm
- Keying bands (pre-installed)
- User manual (digital download)
Warranty & Shipping
- 12-month warranty against defects in material and workmanship.
- Global shipping via FedEx, UPS, or DHL (tracking provided).
- All modules are tested before shipment.
FAQ – Quick Answers
- Q: Can I use this with a 24V DC sensor?
A: No, it is rated for 120V AC/DC only. - Q: Does it support hot-swapping?
A: No, always power down before inserting/removing. - Q: What is the off-state current?
A: Maximum 2.8 mA for both AC and DC. - Q: Is the wiring arm included?
A: Yes, the 1771-WA is included. - Q: How do I check input status?
A: Use the 8 orange LEDs on the front panel.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipment support – we ship worldwide.
- Every unit is tested for functionality and safety.
- We offer surplus and refurbished options with full warranty.
- 12-month warranty on all products.
- Technical verification before shipment – we check every detail.
- Expert support for obsolete control systems.
Contact us:
info@oiltechcontrols.com |
+86 158 8020 0923 (WhatsApp)
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