Product Overview

The 1785-L30B is a PLC5 controller from Allen-Bradley. It features 32K words of user memory. This controller supports up to 1024 I/O points. It can use any mix of discrete and analog I/O. It also supports complementary 1024 inputs and 1024 outputs. The 1785-L30B has two built-in DH+/Remote I/O ports. One serial port supports RS-232, RS-423, and RS-422A standards.

Application Scenarios

This controller works well in manufacturing lines. It handles machine control and process automation. The remote I/O capability suits distributed systems. It can connect to up to 28 remote I/O chassis. Use it for material handling or packaging systems. It also fits water treatment and oil & gas applications.

Technical Specifications

• Processor: PLC-5/30
• User Memory: 32 Kwords battery-backed
• Total I/O: 1024 any mix or 1024 in + 1024 out
• Maximum I/O Chassis: 29 total, 28 remote
• Backplane Current Load: 2.3 A at 5 V
• Power Dissipation: 12 W
• Operating Temperature: 0 to 60 °C
• Serial Port: 1, configurable for RS-232/423/422A
• DH+/RIO Ports: 2 (configurable as adapter or scanner)
• Battery Backup: Yes, with 1770-XYC battery
• EEPROM Program Backup: Yes (1785-ME16, -ME32, -ME64, -M100)

Installation & Maintenance Guide

Mount the 1785-L30B in a 1771 I/O chassis. Ensure proper power supply (1771-P4S, -P6S, etc.). Connect the serial port to a programming device. Set the three-position keyswitch to RUN for operation. Use the BATT indicator to monitor battery status. Replace battery when BATT LED is on. Install EEPROM module in front slot for program backup. Use only FedEx, UPS, or DHL for shipping.

Packing List

• 1 x Allen-Bradley 1785-L30B PLC5 Controller
• 1 x Product Documentation
• 1 x Battery (1770-XYC, pre-installed)