CompactLogix Redundant Controller | Allen-Bradley 1769-L35CR
Manufacturer: Allen Bradley
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Part Number: 1769-L35CR
Condition：New with Original Package
Product Type: Programmable Automation Controllers
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Allen-Bradley 1769-L35CR CompactLogix Redundant Controller
Configured for deterministic communication and mid-range execution in industrial automation networks, the Allen-Bradley 1769-L35CR, also cataloged as the 1769-L35CR CompactLogix Controller, operates as a dedicated hardware component for integrated control, serial processing, and motion interface within the CompactLogix 1769 platform.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-L35CR |
| Brand | Allen-Bradley |
| Origin | China |
| Controller Platform | CompactLogix |
| User Memory | 1.5 MB |
| Local I/O Capacity | Up to 30 local 1769 I/O modules |
| Integrated Communication Ports | 1 x RS-232 serial port, 1 x ControlNet port |
| Network Expansion Options | DeviceNet, EtherNet/IP via external modules |
| Motion Control Capacity | Up to 4 axes via SERCOS interface module |
| Programming Protocols | DF1, ASCII, Modbus RTU (via RS-232) |
| Backplane Current Draw | 800 mA at 5 VDC |
| Operating Temp | 0 to +60 deg C |
| Storage Temp | -40 to +85 deg C |
| Relative Humidity | 5% to 95% RH, non-condensing |
| System Software | RSLogix 5000 / Studio 5000 Logix Designer |
| Certifications | CE, UL, CSA |
Deterministic Network Architecture
The embedded ControlNet port executes scheduled, deterministic data transmissions where transmission updates occur deterministically regardless of changes in node count. Furthermore, the backplane architecture maintains a dedicated communication velocity across local I/O modules, enabling deterministic coordination for motion axes up to 4 axes when linked to a SERCOS interface. Program logic execution relies on the local 1.5 MB memory capacity to execute system tasks alongside networked hardware segments without synchronization latency.
Frequently Asked Questions
Q: What is the maximum physical limitation for local I/O expansion on the 1769-L35CR controller?
A: The controller supports a maximum of 30 local 1769 I/O modules. However, the configuration must not exceed the continuous backplane current capacity of 800 mA at 5 VDC without adding separate 1769 I/O expansion power supplies.
Q: Can this unit utilize the embedded RS-232 port for direct Modbus communication?
A: Yes, the integrated RS-232 serial port is programmatically configurable via RSLogix 5000 or Studio 5000 to execute DF1, ASCII, or Modbus RTU master/slave protocols for peripheral connectivity.
Q: Is hot-swapping or removing modules under power permitted on the 1769 backplane?
A: No, the 1769 CompactLogix platform does not support Removal and Insertion Under Power (RIUP). Power to the backplane bus must be isolated before adding or removing any local I/O modules to prevent controller fault states or physical damage.
Field Installation Guidelines
- Bus Extension Rigidity: Mount the hardware securely to standard DIN rails. Ensure the right-side bus terminator is fully engaged and locked to complete the internal backplane loop continuity.
- ControlNet Cable Shielding: Utilize dual-shielded RG-6 coaxial cables with BNC connectors for all ControlNet connections. Keep network taps terminated with a 75-ohm resistor at the physical ends of the trunk line to eliminate signal reflections.
- Grounding Requirements: Maintain a direct, low-impedance ground path from the DIN rail to the central enclosure ground copper bus bar using a minimum 14 AWG wire size.
- Thermal Management Clearances: Ensure a minimum clearance of 50 mm (2 inches) on all sides of the modular assembly to maintain ambient operational temperatures between 0 and +60 deg C via natural convection.