Overview
Allen-Bradley 1785-L30B PLC-5/30 Processor
The Allen-Bradley 1785-L30B Series C is a standard processor module in the PLC-5 controller family designed by Rockwell Automation. This processor delivers proven performance for mid-range industrial automation and process control applications. With 32K words of user memory and flexible I/O architecture, the 1785-L30B is commonly used in manufacturing, packaging, assembly, and material handling systems where reliable programmable logic control is essential.
Key Features
- 32K Word User Memory: Provides ample space for program logic and data storage in complex control applications.
- 1024 I/O Capacity: Supports up to 1024 I/O points in any mix (discrete or analog) or complementary configuration of 1024 inputs + 1024 outputs.
- Dual DH+/Remote I/O Ports: Two configurable ports function as either adapters or scanners for network connectivity and distributed I/O architectures.
- Serial Port: Configurable for RS-232, RS-423, or RS-422A standards for flexible connectivity options.
- Remote I/O Support: Capable of connecting to up to 28 Remote I/O racks for expanded distributed control architectures.
- Battery-Backed Retention: Integrated battery maintains user and program data during power loss.
Technical Specifications
- User Memory: 32K words SRAM
- Maximum I/O: 1024 points (mixed or complementary)
- Communication Ports: 2× DH+/Remote I/O, 1× Serial (RS-232/423/422A)
- Backplane Current Load: 2.3 Amperes @ 5 VDC
- Remote Racks Supported: Up to 28
- Operating Temperature Range: 0 to 60 °C (32 to 140 °F)
- Storage Temperature Range: −40 to 85 °C (−40 to 185 °F)
- Compatible Power Supplies: 1771-P4S, 1771-P6S, 1771-P4S1, 1771-P6S1
- Series/Revision: Series C
Typical Applications
- Manufacturing automation and assembly lines
- Packaging and material handling systems
- Process control and regulatory systems
- Automotive and food & beverage production
- Distributed Remote I/O architectures over DH+
- Legacy system upgrades and replacements
Compatibility & Replacements
Compatible With
- PLC-5 family controllers and I/O modules
- 1771-series I/O modules and power supplies
- Allen-Bradley Remote I/O adapters and scanners
- DH+ (Data Highway Plus) communication networks
- RS-232, RS-423, and RS-422A serial devices
- Allen-Bradley Handheld Programmers
Replaces / Drop-In Replacement For
- 1785-L30B (all Series A, B revisions)
- Direct replacement in PLC-5/30 racks
Works With
- Programming Software: RSLogix Classic, Allen-Bradley PLC-5 programming tools
- Communication Protocols: DH+, Remote I/O, RS-232/RS-423/RS-422A serial
- Networks: Data Highway Plus (DH+), distributed Remote I/O over DH+
- Ecosystem: PLC-5 product line, 1771-series I/O, Allen-Bradley Industrial Computers
[
{“label”: “Manufacturer”, “value”: “Allen-Bradley (Rockwell Automation)”},
{“label”: “Model Number”, “value”: “1785-L30B”},
{“label”: “Series”, “value”: “C”},
{“label”: “Controller Type”, “value”: “PLC-5/30 Standard Processor”},
{“label”: “User Memory”, “value”: “32K words SRAM”},
{“label”: “Maximum I/O Capacity”, “value”: “1024 points (mixed or complementary)”},
{“label”: “Communication Ports”, “value”: “2× DH+/Remote I/O, 1× Serial”},
{“label”: “Serial Port Configuration”, “value”: “RS-232, RS-423, RS-422A”},
{“label”: “Backplane Current”, “value”: “2.3 A @ 5 VDC”},
{“label”: “Remote I/O Racks”, “value”: “Up to 28”},
{“label”: “Operating Temperature”, “value”: “0 to 60 °C (32 to 140 °F)”},
{“label”: “Storage Temperature”, “value”: “−40 to 85 °C (−40 to 185 °F)”},
{“label”: “Compatible Power Supplies”, “value”: “1771-P4S, 1771-P6S, 1771-P4S1, 1771-P6S1”},
{“label”: “Condition”, “value”: “Used”}
]
