Product Overview
The Allen-Bradley 1785-L60B is a PLC-5/60 programmable logic controller designed for medium to large-scale industrial automation. This processor module from Rockwell Automation provides up to 64KWords of user memory and supports a maximum total I/O of 3072 points (any mix) or 3072 inputs plus 3072 outputs in complementary mode. It is built for reliable control in demanding environments.
Technical Specifications Breakdown
Key parameters for the 1785-L60B are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Module Type | PLC5 Processor |
| Part Number/Catalog No. | 1785-L60B |
| Controller Memory | up to 64KWords |
| Max User Memory Words | 64 Kilowords |
| Max Total I/O | 3072 (any mix) or 3072 in + 3072 out (complementary) |
| Max Analog I/O | 3072 |
| Max. no. of I/O Racks | 24 |
| Max I/O Chassis Total | 93 |
| Max I/O Chassis Remote | 92 |
| Communication Ports | Four (4) DH+/Remote I/O (Adapter or Scanner), One (1) serial port configurable for RS-232 and 423 and RS-422A compatible and Two (2) programming terminals |
| Supported Protocols | DF1, ASCII, Data Highway Plus (DH+), Remote I/O (RIO) |
| Battery | 1770-XYC |
| Processor | PLC-5/60 |
| Battery-Backed Static RAM | Yes |
| EEPROM Program Backup Option | Yes (using 1785-ME16, -ME32, -ME64, and -M100) |
| I/O Scan Time Per Rack | 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s |
| RS-232-C/422-A/423- A Ports | 1 |
Industry Applications
For example, in a material handling system with over 2000 discrete sensors and actuators, the 1785-L60B can manage 3072 I/O points across 24 racks. In a water treatment plant, its DH+ and RIO ports enable seamless integration with remote I/O chassis up to 92 units. The serial port supports DF1 and ASCII protocols for connecting to HMIs or SCADA systems.
Installation & Setup Guidance
Mount the 1785-L60B in an open-style enclosure within a clean, dry environment. Use the 1770-CD or Belden 9463 cable for DH+ and RIO connections (3-pin terminals). The serial port uses a 25-pin sub-D connector; configure it for RS-232, RS-423, or RS-422A as needed. Programming terminals connect via 8-pin mini-DIN circular connectors. Ensure the battery (1770-XYC) is installed and replace it within 30 days after the BATT LED activates to avoid memory loss.
Maintenance & Reliability
Periodically inspect the status LEDs: BATT (battery), RUN/FAULT (mode), FORCE (I/O forcing), and COMM (channel 0 communication). The module operates in a relative humidity range of 5-95% without condensation. For memory backup, use 1785-ME16 (16KWords), 1785-ME32 (32KWords), 1785-ME64 (64KWords), or 1785-ME100 (100KWords) EEPROM modules.
Compatibility & Integration
The 1785-L60B supports three I/O hardware-addressing modes: 2-slot, 1-slot, and half-slot. It communicates via DH+ and RIO networks, with a maximum of 93 I/O chassis (32 per link). The control coprocessor expansion port allows additional functionality. The controller is UL, C-TICK, CE, and CSA-certified.
Selection Guide & Purchasing Advice
When selecting a PLC-5/60 controller, verify your I/O count and communication needs. At AutoDCSTech, we offer this model with fast shipping and expert support. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 1785-L60B |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
