Product Overview
The Allen-Bradley 1771-IC is a digital DC input module from the 1771 Series, designed for use in PLC-5 systems. This module provides 8 sink-type (source load) inputs with a voltage category of 10-60 Volts DC. It features input filtering that limits and suppresses voltage transients caused by electrical noise or contact bounce, reducing electrically-related downtime and extending product life. The module is shipped in a static-shield bag for protection against electrostatic discharge.
Technical Specifications Breakdown
Key parameters for the 1771-IC are listed below for quick reference:
| Feature | Specification |
|---|---|
| Part Number | 1771-IC |
| Brand | Allen-Bradley |
| Module Type | Digital DC Input Module |
| Number of Inputs | 8 Inputs |
| Voltage Category | 10-60 Volts DC, Sink (Source Load) |
| DC Operating Voltage | 42-56 Volts |
| Backplane Current | 74 Miliamperes |
| Max DC Off-State Current | 3.7 Miliamperes |
| Typical DC Signal Delay (On) | 15 (+/- 7) ms (Digital Filter) |
| Typical AC Signal Delay (Off) | 20 (+/- 15) ms |
| Wiring Arm | 1771-WN |
| Coating | Conformal Coat |
| Dimensions | 3.5 x 6.5 x 2.0 in (89 x 165 x 51 mm) |
Industry Applications
It works with 2 and 3-wire devices including DC proximity switches, limit switches, float switches, pushbuttons, photoelectric sensors, and selector switches. For 3-wire applications, the off-state leakage should not exceed 4mA. The input filtering reduces false triggering from electrical noise, making it suitable for environments with high electromagnetic interference.
Installation & Setup Guidance
Mount the 1771-IC module into any I/O slot of a 1771 chassis. It receives power via the 1771 I/O backplane from the power supply. Use wiring arm 1771-WN for field wiring connections. Ensure that the DC operating voltage is within the 42-56 Volts DC range. For 3-wire devices, verify that the off-state leakage current does not exceed 4 mA to avoid false on-states.
Maintenance & Reliability
The conformal coating protects the module from moisture and contaminants, enhancing reliability in harsh environments. Periodically inspect the module for dust accumulation and ensure proper ventilation. The input filtering extends product life by suppressing voltage transients.
Compatibility & Integration
The 1771-IC is compatible with PLC-5 processors and 1771 I/O chassis.
Selection Guide & Purchasing Advice
When selecting the 1771-IC, verify that your application requires 8 DC inputs with a 10-60V DC voltage category. For sourcing this module, contact AutoDCSTech for availability and lifecycle status. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Troubleshooting & Common Issues
If the module does not power on, check the backplane connection and ensure the power supply is delivering adequate current. If inputs do not respond, verify the DC operating voltage is within 42-56 Volts and that field wiring is correct. For intermittent signals, inspect for electrical noise sources and confirm the off-state current is below 3.7 mA.
Availability & Condition at AutoDCSTech
| Part Number | 1771-IC |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
