Product Overview
The Allen-Bradley 1785-L60L is a standard processor from the PLC-5 series, designed to serve as the central control unit in industrial automation systems. This processor and programmable controller manages local, extended, and remote I/O modules, providing a robust backbone for process control. With 64 kilowords of user memory and support for up to 3072 I/O points, the 1785-L60L handles complex applications with ease.
Key Features & Benefits
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High Memory Capacity: 64 Kilowords of battery-backed static RAM ensures program retention during power loss.
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Flexible Communication: Integrated DH+ and remote I/O channels enable seamless integration with existing networks.
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Scalable I/O: Supports up to 3072 total I/O points (mix of inputs/outputs) and 81 I/O chassis, making it suitable for large installations.
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Fast Scan Times: I/O scan time as low as 0.5 ms per rack (extended local) ensures responsive control.
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EEPROM Backup: Optional program backup using 1785-ME16, -ME32, -ME64, or -M100 modules protects your programs.
Technical Specifications
| Specification |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number/Catalog No. |
1785-L60L |
| Module Type |
Standard Processor |
| Processor |
PLC-5/60L |
| Max User Memory Words |
64 Kilowords |
| Battery-Backed Static RAM |
Yes |
| EEPROM Program Backup Option |
Yes (using 1785-ME16, -ME32, -ME64, and -M100) |
| Protected Memory |
No |
| Max Total I/O |
3072 (any mix) or 3072 in + 3072 out (complementary) |
| Max Analog I/O |
3072 |
| I/O Scan Time Per Rack |
0.5 ms (ext. local), 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s |
| Max I/O Chassis Total |
81 |
| Max I/O Chassis Extended Local |
16 |
| Max I/O Chassis Universal Remote |
32 Max. Per I/O Link |
| RS-232-C/422-A/423-A Ports |
1 |
| Control Coprocessor Expansion Port |
Yes |
Applications
The 1785-L60L excels in industries requiring reliable, high-speed control. Typical applications include:
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Manufacturing Lines: Coordinating multiple assembly stations with up to 3072 I/O points ensures precise sequencing.
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Material Handling: With DH+ networking, the 1785-L60L integrates with conveyors and sortation systems for real-time tracking.
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Process Control: In chemical or food processing, its 64K memory handles complex recipes and data logging.
Installation & Setup
Mount the 1785-L60L in a standard PLC-5 chassis. Connect power to the backplane (3.3 Amps at 5 Volts). For communication, use the 25-pin Channel 0 for RS-232-C programming, and the 3-pin connectors for Channels 1A/1B (remote I/O or DH+). The 8-pin mini DIN provides a DH+ programming port. Ensure all devices on a DH+ link operate at the same baud rate, and respect cable length limits (3048m at 57.6 kbits/s, 762m at 230.4 kbits/s). For extended local I/O, keep cable within 100 feet using the 1771-ALX adapter.
Maintenance & Reliability
Regularly check the BATT indicator; replace the battery every 2-3 years to preserve RAM. Keep the front panel clean and ensure proper ventilation. The 1785-L60L's status indicators (PROC, FORCE, COMM) help diagnose issues quickly. With battery-backed RAM and EEPROM backup options, downtime is minimized, extending the controller's service life.
Compatibility & Integration
The 1785-L60L communicates via DH+ and remote I/O links, supporting peer-to-peer networking with other PLC-5 controllers. It works with 1771 I/O chassis and the 1771-ALX adapter for extended local I/O. The RS-232-C port supports ASCII and DF1 protocols for programming and SCADA integration.
Selection Guide
When ordering, verify the part number 1785-L60L and include memory modules (1785-ME16, -ME32, -ME64, or -M100) if EEPROM backup is needed. Ensure your system's power supply can handle the 3.3A backplane load. PLC Source PRO offers genuine Allen-Bradley 1785-L60L modules with fast shipping.