The Allen-Bradley 1785-L30B is a powerful PLC-5/30 standard processor CPU module designed for high-capacity industrial automation control. As part of the Rockwell Automation PLC-5 family, it delivers strong processing performance, expanded memory, and flexible communication capabilities for large-scale manufacturing and process control systems.
Engineered for demanding environments, the 1785-L30B is widely used in legacy industrial plants where long-term system stability, extensive I/O handling, and reliable DH+ networking remain essential for continuous production.
Technical Specifications (including Dimensions & Weight)
| Parameter | Specification |
|---|---|
| Product Type | PLC-5/30 Processor CPU Module |
| Series | PLC-5 |
| Processor Type | Standard Processor |
| User Memory | 32 Kilowords SRAM |
| Memory Backup | Battery-backed SRAM |
| EEPROM Support | 1785-ME16 / ME32 / ME64 / M100 |
| Communication Ports | 2 × DH+ / Remote I/O + 1 × Serial |
| Serial Standards | RS-232 / RS-422 / RS-423 |
| Max Total I/O | 1024 (any mix) or 1024 IN + 1024 OUT |
| Max I/O Chassis | Up to 29 |
| Remote I/O Chassis | Up to 28 |
| Backplane Current | 2.3 A @ 5V DC |
| Power Dissipation | ~12 W |
| Installation | 1771 PLC-5 Chassis |
| Operating Temperature | 0°C to 60°C |
Physical Dimensions & Weight
| Item | Value |
|---|---|
| Size (L × W × H) | 280 × 140 × 50 mm |
| Weight | ~1.2 kg |
Recommended Related Models
- 1785-L20B – mid-range PLC-5 processor module
- 1785-L11B – entry-level PLC-5 CPU module
- 1785-ENET – Ethernet communication module for PLC-5
- 1784-PCIC – PCI communication interface card
- 1756-L81E – modern ControlLogix replacement platform
Popular Allen-Bradley Models
- 1756-L81E ControlLogix Processor Module
- 1769-L33ER CompactLogix Controller
- 1756-EN2T EtherNet/IP Communication Module
- 1734-AENT POINT I/O Adapter
- 1794-ACN Flex I/O Communication Adapter
