Description
Product Name ：1771-1AD Allen‑Bradley Central control module
Product details:
The Allen-Bradley 1771-IAD is an AC/DC Input Module belonging to the PLC-5 series (Universal I/O chassis system). It is designed to sense AC or DC voltage levels from field devices and convert them into digital signals that the PLC processor can read.
Technical Specifications (产品参数)
The 1771-IAD is known for its high-density channel configuration and robust industrial design.
| Parameter | Specification |
| Module Type | Digital AC/DC Input Module |
| Number of Inputs | 16 Channels (Inputs) |
| Nominal Input Voltage | 120V AC / 120V DC |
| Operating Voltage Range | 92–138V AC (47–63 Hz) or 105–138V DC |
| Maximum Input Current | 14 mA @ 132V AC (60 Hz) / 11 mA @ 132V DC |
| Backplane Current Load | 250 mA @ 5V DC |
| Maximum Propagation Delay | Turn-on: 20ms (AC), 10ms (DC)
Turn-off: 32ms (AC), 20ms (DC) |
| Isolation Voltage | 1500V AC RMS (continuous) |
| Wiring Arm | 1771-WH |
| Status Indicators | 16 Red LED Status Indicators (one per channel) |
Key Advantages (产品优势)
- High Density: Features 16 inputs in a single-slot module, allowing you to maximize chassis space and reduce overall hardware footprints.
- AC/DC Versatility: Capable of interfacing with both 120V AC and 120V DC signals, giving system integrators flexibility in mixed-signal environments.
- Robust Optical Isolation: Protects the sensitive PLC-5 backplane logic circuitry from unpredictable voltage spikes, electrical noise, and transients on the field side (up to 1500V).
- Easy Troubleshooting: Equipped with 16 front-panel LEDs that provide immediate visual feedback on the ON/OFF status of each input channel, greatly simplifying diagnostics.
- Modular Reliability: Built for harsh industrial environments, offering high thermal stability and resistance to electromagnetic interference (EMI).
Product Applications (产品应用)
The 1771-IAD module acts as the “eyes and ears” of the control system, typically used to monitor state changes in 120V control circuits. Common applications include:
- Limit and Proximity Switches: Monitoring the physical position of machinery, valves, or safety gates.
- Pushbuttons and Selector Switches: Capturing operator inputs from control panels or field stations.
- Motor Starter Contacts: Verifying the actual run/stop status of auxiliary contacts on motor starters and contactors.
- Interlocking Circuits: Integrating traditional 120V hardwired safety and control loops into the PLC logic.
- Legacy System Support: Widely utilized in retrofitting, maintaining, or expanding existing Allen-Bradley PLC-5 infrastructure across automotive, water treatment, and manufacturing industries.
Important Considerations & Precautions (注意事项)
⚠️ Critical Warnings for Installation and Maintenance:
- Do Not Hot Swap: Always turn off the chassis power and field power before installing, removing, or wiring the module. Inserting or removing the module under power can cause electrical arcing, potentially damaging the equipment or causing injury.
- Keying Positions: Ensure the chassis slot is properly keyed to match the 1771-IAD module. Plastic keying bands must be placed on the chassis backplane connector between lines 4 and 6 and between 24 and 26 to prevent inserting the wrong module type.
- Leakage Current Handling: When connecting proximity switches or solid-state sensors to this module, ensure their off-state leakage current is lower than the module’s minimum off-state current requirement to prevent “ghost” inputs.
- Lifecycle Awareness: The PLC-5 and 1771 platform is a legacy, discontinued line by Rockwell Automation. While highly reliable, long-term support strategy should involve sourcing certified surplus units or planning a migration path to newer platforms (like ControlLogix).
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
We have the same series of models in stock. If you don’t find the model you need, please contact us and we will provide you with an official quotation！
Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: Sweden
Price: Please contact us Product weight：0.515kg
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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