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- Allen Bradley
- FM1771
- Empty Slot Filling Card
- USA
- 185 x 30 x 120 mm
- 0.1 kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
- 1-3 Working Days
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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
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All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Allen-Bradley FM1771 is an Empty Slot Filling Card (Filler Module) designed for use in the Allen-Bradley 1771 I/O chassis system (commonly associated with PLC-5 and similar legacy control architectures).
It does not perform any control or signal processing functions. Instead, it is used to occupy unused slots in a PLC rack, ensuring proper airflow, electrical shielding, mechanical stability, and backplane protection.
This type of component is typically found in legacy industrial automation systems where unused rack positions must still be physically filled for reliable operation.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | FM1771 |
| Product Type | Empty Slot Filler Card / Rack Insert |
| System Compatibility | 1771 I/O Chassis (PLC-5 / Remote I/O systems) |
| Function | Mechanical and electrical slot filler |
| Electrical Function | None (non-active component) |
| Installation Position | Empty slot in 1771 rack |
| Construction | Passive insert module |
| Dimensions | 185 × 30 × 120 mm |
| Weight | ~0.1 kg |
Function and Working Principle
The FM1771 is a non-electronic passive module.
Its main functions include:
- Filling unused slots in a 1771 I/O rack
- Maintaining correct airflow inside the control cabinet
- Preserving electromagnetic shielding integrity
- Preventing dust, debris, and contamination from entering the backplane area
- Maintaining mechanical stability of the chassis structure
- Ensuring proper rack configuration for legacy PLC systems
It does not communicate with the PLC system and has no I/O or processing capability.
Role in Industrial Control Systems
Within a 1771-based system, the FM1771 functions as:
- A physical placeholder for unused I/O slots
- A protection component for backplane connectors
- A maintenance aid for rack layout consistency
- A stability and airflow management accessory
It is especially important in older PLC architectures where slot integrity affects system reliability and noise immunity.
Industrial Applications
The FM1771 is used in:
- PLC-5 control systems
- 1771 remote I/O chassis installations
- Legacy manufacturing automation systems
- Process control systems in long-life industrial plants
- Retrofit or maintenance of older Allen-Bradley installations
Installation and System Integration
- Installed directly into an unused slot of a 1771 I/O chassis
- Requires no wiring or configuration
- Slides into rack backplane like a standard module
- Locked in place using chassis latch or locking mechanism
- Removed only when replacing or expanding system hardware
Compatible System Components
- Allen-Bradley PLC-5 controllers
- 1771 I/O modules (digital, analog, specialty cards)
- 1771 remote I/O adapters (e.g., ASB modules)
- 1771 I/O chassis backplanes
- Legacy Rockwell Automation control systems
Recommended Alternative Models
| Model | Product Type | Key Feature | Application |
|---|---|---|---|
| FM1771 | Empty Slot Filler | Standard 1771 rack filler | Legacy PLC-5 systems |
| 1771-EX | Expansion module placeholder | System-specific variant | Industrial retrofits |
| Generic 1771 filler | Rack insert | Equivalent passive filler | Maintenance replacement parts |
Key Advantages
- Maintains proper rack airflow and cooling balance
- Protects backplane connectors from contamination
- Preserves EMC (electromagnetic compatibility) integrity
- Ensures correct mechanical stability of chassis
- Required for proper layout in legacy 1771 systems
- Simple installation with no wiring or configuration
Technical FAQs
Q1: Does FM1771 perform any control function?
No, it is a purely passive filler module with no electrical or logic function.
Q2: Why is it needed in a PLC rack?
It maintains mechanical balance, airflow, and shielding integrity in unused slots.
Q3: Can the system run without it?
In many cases it may still operate, but it is not recommended, especially in legacy 1771 systems.
Q4: Is it programmable?
No, it has no programming or communication capability.
Conclusion
The Allen-Bradley FM1771 Empty Slot Filling Card is a passive rack component used in 1771 I/O chassis systems to occupy unused slots. While it has no electronic function, it plays an important role in maintaining system stability, airflow, and electrical integrity in legacy PLC installations.