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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Controller Family | Logix5563 (ControlLogix L6x) |
| User Memory | 8 MB |
| I/O Memory | 478 KB |
| Optional Nonvolatile Memory | 64 MB (1784-CF64) or 128 MB (1784-CF128) |
| Max Digital I/O | 128,000 |
| Max Analog I/O | 4,000 |
| Total I/O, Max | 128,000 |
| Backplane Current @ 5.1 V DC | 1.20 A (1200 mA) |
| Backplane Current @ 24 V DC | 14 mA |
| Power Dissipation | 3.5 W |
| Thermal Dissipation | 11.9 BTU/hr |
| Built-in Port | RS-232 serial |
| Battery (Series A) | 1756-BA1, 1756-BATM, or 1756-BATA |
| Battery (Series B) | 1756-BA2 |
| Operating Temperature | 0 °C to +60 °C |
| Weight (approx.) | Series A: 0.32 kg; Series B: 0.35 kg |
4. Product Introduction
The Allen-Bradley 1756-L63 is a Logix5563 ControlLogix controller with 8 MB of user memory and 478 KB of I/O memory. It installs in any slot of a 1756 ControlLogix chassis and supports standard Logix programming languages (ladder logic, function block diagram, structured text, and sequential function chart).
The controller includes a built-in RS-232 serial port and works with the full range of ControlLogix communication modules. Optional CompactFlash cards (1784-CF64 or 1784-CF128) provide nonvolatile program storage. This L6x-series controller has been discontinued and is commonly replaced by the L7x or L8x families in new designs. Remaining units are used to maintain existing installations.
1756-L63
1756-L63
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Controller will not go to Run | Major fault, battery failure, or memory issue | ✅ High | Check fault log and battery status | Clear faults; replace battery (BA1/BA2) |
| Loss of program on power cycle | Dead battery or missing CompactFlash | ✅ High | Verify battery voltage and CompactFlash presence | Replace battery; install/replace CF card |
| Keyswitch or mode problems | Keyswitch failure or remote mode conflict | ✅ High | Verify keyswitch position and controller mode bits | Cycle keyswitch; check GSV/SSV |
| High backplane current / overheating | Chassis overload or poor ventilation | ❌ Medium | Measure total chassis current draw | Redistribute modules or improve cooling |
| Serial port communication failure | Incorrect cable or driver settings | ✅ Medium | Test with 1756-CP3 or 1747-CP3 cable | Verify baud rate and RSLinx/Studio 5000 driver |
| I/O connections dropping | Network or produced/consumed tag issue | ❌ Low | Monitor connection status in programming software | Re-establish I/O and produced/consumed tags |
If diagnostics remain unclear, capture the fault log, battery status, and CompactFlash presence before contacting support.
6. Frequently Asked Questions (FAQ)
Q: Is the 1756-L63 still available new from Rockwell? No. The L6x series has been discontinued. Available units are New Surplus or refurbished stock from secondary markets.
Q: How much memory does the 1756-L63 have? It provides 8 MB of user (data and logic) memory and 478 KB of I/O memory. Optional CompactFlash cards add nonvolatile storage.
Q: Does it require a battery? A battery is required to retain the real-time clock and volatile tag data during power loss. Series A uses 1756-BA1/BATM/BATA; Series B uses 1756-BA2. A CompactFlash card can store the program independently of the battery.
Q: What is the recommended replacement? Modern replacements are the ControlLogix 5570 (L7x) or 5580 (L8x) series controllers. Project conversion in Studio 5000 is typically required.
Q: Can multiple L63 controllers be placed in one chassis? Yes. ControlLogix supports multiple controllers in the same chassis, limited by power supply capacity and application design.
Q: What programming software is required? RSLogix 5000 or Studio 5000 Logix Designer (version compatible with the controller firmware).
Q: Why is New Surplus priced lower than original list? These are genuine Allen-Bradley modules from excess inventory or cancelled projects. They are unused and typically supplied with anti-static protection. They are not refurbished unless specifically stated.
