Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-L63XT |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | ControlLogix-XT Logix5563 Processor |
| User Memory | 8 MB |
| I/O Memory | 478 KB |
| Controller Tasks | 32 tasks, 100 programs per task |
| Built-in Communication Port | 1 × RS-232 serial |
| Controller Connections (max) | 250 |
| Analog I/O (max) | 4,000 |
| Digital I/O (max) | 128,000 |
| Backplane Current (5.1V DC) | 1.2 A |
| Backplane Current (24V DC) | 14 mA |
| Power Dissipation | 3.5 W |
| Operating Temperature (XT, standalone) | -25°C to +70°C |
| Operating Temperature (XT with FLEX I/O-XT) | -20°C to +70°C |
| Optional Nonvolatile Memory | 1784-CF64 or 1784-CF128 CompactFlash |
Main Features and Advantages
The 1756-L63XT delivers the proven processing capabilities of the Logix5563 platform with environmental hardening that standard ControlLogix controllers cannot match. Its 8 MB user memory supports complex control programs with up to 32 tasks and 100 programs per task, sufficient for demanding process control, motion, and discrete automation applications . The processor handles up to 250 controller connections and 128,000 digital I/O points, providing ample capacity for large-scale control architectures.
Conformal coating is the 1756-L63XT‘s primary differentiator. This protective layer shields the processor’s printed circuit boards from the corrosive effects of hydrogen sulfide, chlorine, and other industrial contaminants commonly found in wastewater treatment, petrochemical, and mining environments. The extended temperature range allows the 1756-L63XT to operate in unheated outdoor cabinets or remote installations where ambient temperatures may drop well below freezing or rise above standard controller limits.
For redundancy-critical applications, the 1756-L63XT supports full controller redundancy when paired with the appropriate redundancy modules, enabling seamless primary-to-secondary switchover in the event of a processor fault . The built-in RS-232 serial port supports DF1 Point-to-Point, DF1 Radio Modem, DF1 Slave, and ASCII protocols, providing a direct programming and diagnostics interface without requiring a separate communication module . Firmware revisions up to 20.019 are available for the 1756-L63 family, ensuring compatibility with RSLogix 5000 and Studio 5000 programming environments .
