1785-L30B | Allen Bradley PLC-5 Programmable Controller

Product Description

The Allen Bradley PLC-5 1785-L30B Programmable Controller is a standard processor module designed for medium-to-large automation systems. With 32K words of user memory, multiple communication interfaces, and support for extensive I/O configurations, it delivers reliable control performance in demanding industrial environments.

Technical Specifications

• Model / Part Number 1785-L30B

• Manufacturer Allen Bradley (Rockwell Automation)

• Product Line PLC-5 Series

• Product Type Programmable Logic Controller (PLC)

• Weight 2.75 lbs (1.25 kg)

• Processor Type PLC-5/30 Standard Processor

• User Memory 32K words, battery-backed static RAM

• EEPROM Backup Option Supported (1785-ME16, -ME32, -ME64, -M100)

• Communication Interfaces

• 2 DH+/Remote I/O ports (adapter or scanner)

• 1 configurable serial port (RS-232, RS-423, RS-422A)

• Battery 1770-XYC

• Power Supply Compatibility 1771-P4S, -P6S, -P4S1, -P6S1

• Backplane Current Load 2.3 A

• Power Dissipation 12 W

• Maximum I/O Capacity

• 1024 mixed I/O points

• 1024 analog I/O points

• Up to 29 total I/O chassis (28 remote, 1 local)

• Remote I/O Support Up to 12 chassis

• I/O Scan Time per Rack

• 10 ms at 57.6 kbps

• 7 ms at 115.2 kbps

• 3 ms at 230.4 kbps

• Operating Temperature 0–60 °C (32–140 °F)

• Non-Operating Temperature –40–85 °C (–40–185 °F)

• Shock Resistance IEC 60068 compliant (thermal shock, cold, dry heat)

• Mounting Rack mountable

Application Scenarios

• Medium-to-large automation systems requiring multiple I/O chassis

• Process control environments with high communication demands

• Industrial setups needing reliable memory backup and fast I/O scan times

FAQ

Q: How much memory does the 1785-L30B provide?  A: It offers 32K words of user memory with battery backup.

Q: What communication interfaces are supported?  A: Two DH+/Remote I/O ports and one configurable RS-232/422/423 serial port.

Q: What is the maximum number of I/O chassis supported?  A: Up to 29 chassis (1 local, 28 remote).

Q: Does the controller support EEPROM backup?  A: Yes, with compatible EEPROM modules (1785-ME16, -ME32, -ME64, -M100).

Comparison with Similar Models

• 1785-L30B: PLC-5/30 processor, 32K memory, medium-scale systems

• 1785-L40B: PLC-5/40 processor, larger memory capacity, extended I/O support

• 1785-L60B: PLC-5/60 processor, maximum memory and I/O capacity for large-scale automation