Allen‑Bradley 1771‑IM PLC‑5 AC/DC Input Module
The 1771‑IM is a digital input module for the PLC‑5 platform. It operates with 8 discrete channels for 220V AC or DC field signals. This module converts high‑voltage inputs from pushbuttons, limit switches, and float switches to logic levels for the processor. It supports 184‑276V AC and 184‑276V DC operating ranges. The 1771‑IM provides optoelectrical isolation and input filtering for reliable operation in industrial environments.
Technical Data
- Brand: Allen‑Bradley / Rockwell Automation
- Model: 1771‑IM
- Type: Digital AC/DC Input, 8 points
- Voltage Category: 220V AC/DC
- AC Operating Range: 184‑276V AC
- DC Operating Range: 184‑276V DC
- Nominal Input Current: 3mA @220V AC 50Hz; 3.5mA @220V AC 60Hz; 2.6mA @240V DC
- Off‑State Max Current: 1.0mA (AC/DC)
- Off‑State Max Voltage: 92‑114V AC
- Signal Delay AC (On/Off): 20ms ±6ms
- Signal Delay DC (On): 10ms ±4ms
- Signal Delay DC (Off): 20ms ±9ms
- Backplane Current: 75mA @5V DC
- Power Dissipation: 0.4W (min) – 2.4W (max)
- Thermal Dissipation: 3.2 – 10.9 BTU/hr
- Wiring Arm: 1771‑WA (included)
- Mounting: Rack‑mountable, single slot
- Environmental: 32‑140°F (0‑60°C); 5‑95% RH non‑condensing
Installation & Field Wiring
- Insert the 1771‑IM into any available slot of a 1771 I/O chassis with a PLC‑5 processor.
- Use the supplied 1771‑WA wiring arm for all field terminations. This arm preserves wiring during module replacement.
- Keying bands: position the upper key between pins 10‑12 and lower key between pins 4‑6.
- Verify chassis power supply capacity before installation (backplane draw is 75mA).
Configuration & Diagnostics
- Configure the module via the PLC‑5 channel configuration utility. The system auto‑creates the corresponding binary data file bits.
- Each channel has a front‑panel LED for real‑time status indication.
- Built‑in input filtering reduces nuisance trips from electrical noise.
- Diagnostic data is accessible through the processor’s data table.
Typical Applications & Compatible Devices
This module interfaces with:
- Pushbuttons and selector switches (220V AC/DC)
- AC limit switches and float switches
- Motor starter auxiliary contacts
- Annunciators and alarm contacts
- On/off actuators and solenoid feedback
Professional FAQ – Oiltech Controls Insight
- Q: Can I use the 1771‑IM with 240V DC systems?
A: Yes. The DC operating range is 184‑276V DC, so 240V DC is well within specification. - Q: What is the minimum on‑state current for reliable detection?
A: The minimum on‑state current is 2.9mA. If your field device provides less than this, the module may not register an On signal. - Q: How does the off‑state voltage affect my system?
A: The maximum off‑state voltage is 92‑114V AC. This means leakage currents below this level are ignored, preventing false triggering. - Q: Is the 1771‑IM compatible with the 1771‑WA wiring arm from other modules?
A: Yes, the 1771‑WA is a standard arm used across many 1771 I/O modules. It is fully compatible. - Q: Which PLC processors work with this module?
A: The 1771‑IM works with any PLC‑5 processor that supports 1771 I/O chassis and ½‑, 1‑, or 2‑slot addressing.
Why Buy From Oiltech Controls?
- 15+ years of focused experience in industrial automation spares.
- Global logistics – we ship with FedEx, UPS, or DHL.
- Every unit undergoes technical verification before shipment.
- Offering tested surplus and refurbished options with full functionality.
- 12‑month warranty covering all products.
- Expert support for obsolete control systems and legacy PLCs.
Shipping & Warranty
We dispatch within 24‑28 hours after order confirmation. Tracking via FedEx, UPS, or DHL. All orders include a 12‑month warranty against defects.
Contact Information
Inquiries: info@oiltechcontrols.com
WhatsApp: +86 158 8020 0923
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