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Product Overview
The 1756-L63/A is an extreme-environment ControlLogix processor manufactured by Allen-Bradley, a brand of Rockwell Automation, and is the extended-temperature member of the Logix5563 family of programmable automation controllers. Identified by the “XT” designation in its full catalog number, the 1756-L63/A delivers the same 8 MB of user memory, 478 KB of I/O memory, and 128,000-point I/O capacity as the standard 1756-L63, but is built to survive temperature extremes, corrosive atmospheres, and the kind of particulate contamination that shortens the life of a conventional controller. At its core is the single-core Logix5563 CPU, a mature architecture that has been the backbone of ControlLogix systems for well over a decade and that continues to run the same RSLogix 5000 and Studio 5000 projects that plants depend on for process continuity.The distinction of the 1756-L63/A is not processing speed but environmental resilience. Where the standard 1756-L63 is rated for 0–60 °C, the 1756-L63/A is rated for –25 to +70 °C, a range that covers unheated pump stations in northern climates, desert solar installations, and equipment rooms where the air conditioning has failed. The factory-applied conformal coating — a minimum 0.004 in deposit per IPC-A-610 Class 3 — protects the printed circuit from moisture, salt spray, and chemical contaminants, preventing the dendritic growth and terminal corrosion that eventually disable an uncoated board. An enhanced heatsink and extended-temperature component selection complete the hardening, allowing the module to dissipate its 3.5 W quietly and without the thermal cycling that ages solder joints. The 1756-L63/A occupies a single slot in any 1756 chassis, draws 1.2 A at 5.1 V DC from the backplane, and supports removal and insertion under power (RIUP), so a failed processor can be swapped without powering down the rack — a capability that matters most in continuous-process plants where the controller is the only thing standing between a stable process and a costly shutdown.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-L63/A |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | ControlLogix-XT Logix5563 Processor (Programmable Automation Controller) |
| Processor Family | Logix5563 (single-core CPU) |
| User Memory | 8 MB (8,388,608 bytes) |
| I/O Memory | 478 KB |
| Optional Nonvolatile Memory | 128 MB CompactFlash card (1784-CF128) |
| Maximum Digital I/O | 128,000 points |
| Maximum Analog I/O | 4,000 points |
| Total I/O (max) | 128,000 points |
| Tasks Supported | 32 (1 continuous + 31 periodic/event) |
| Programs per Task | 100 |
| Typical Scan Time | 0.08 ms per K word |
| Onboard Communication Ports | 1 × RS-232 (DB-9), DF1/DH-485/ASCII; no onboard Ethernet |
| Backplane Current (5.1 V DC) | 1.2 A (1200 mA) |
| Backplane Current (24 V DC) | 14 mA |
| Power Dissipation | 3.5 W |
| Thermal Dissipation | 11.9 BTU/hr |
| Isolation Voltage | 30 V continuous (basic insulation, RS-232 to system); type-tested at 720 V DC for 60 s |
| Replacement Battery | Series A: 1756-BA1, 1756-BATM, or 1756-BATA; 1756-BA2 (0.50 g lithium) |
| Memory Retention | Battery-backed SRAM; retained program and real-time clock |
| Removable Terminal Block | 1756-TBCH (screw clamp) or 1756-TBS6H (spring clamp), ordered separately |
| Indicators | Six status indicators (RUN, FORCE, I/O status, RS-232 activity, and controller health) |
| Keying | Electronic keying, software configurable |
| Slot Width | 1 slot |
| Module Location | Chassis-based, any slot |
| Compatible Chassis (standard) | 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17 |
| Compatible Chassis (XT) | 1756-A4LXT, 1756-A5XT, 1756-A7LXT, 1756-A7XT |
| Standard Power Supplies | 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75 |
| XT Power Supplies | 1756-PAXT, 1756-PBXT |
| Redundant Power Supplies | 1756-PA75R, 1756-PB75R, 1756-PSCA2 |
| Dimensions (H × W × D) | 145.2 × 34.6 × 139.6 mm (5.72 × 1.36 × 5.50 in) |
| Weight | Approximately 0.32 kg (0.71 lb) — Series A |
| Enclosure Type | Open style (none), IP20 when installed in an enclosure |
| Operating Temperature | –25 to +70 °C (–13 to +158 °F) — XT rating; note: paired with 1756-A7LXT chassis, upper limit reduces to 60 °C |
| Storage Temperature | –40 to +85 °C (–40 to +185 °F) |
| Relative Humidity | 5–95% RH, non-condensing |
| Conformal Coating | Factory-applied, minimum 0.004 in per IPC-A-610 Class 3 |
| Vibration | 2 g @ 10–500 Hz (IEC 60068-2-6) |
| Shock | 30 g operational, 50 g non-operational (IEC 60068-2-27) |
| Altitude | Up to 2000 m without derating |
| North American Temp. Code | T4A |
| Certifications | cULus, CE, C-Tick, KC, FM Class I Division 2 (A/B/C/D, T4), ATEX Zone 2, DNV, GL, ABS, LR, RoHS |
| Programming Software | RSLogix 5000 v10 or later; Studio 5000 Logix Designer |
| Supported Languages | Ladder diagram, structured text, function block diagram, sequential function chart |
| Supported Networks | EtherNet/IP, ControlNet, DeviceNet, DH+, Remote I/O, SynchLink, and third-party networks via communication modules |
