1785-L20E/E Allen-Bradley PLC 5 Controller

Description

The Allen-Bradley 1785-L20E/E is a PLC-5/20E controller from the PLC-5 family, offering integrated Ethernet and multi-protocol communications. Designed for reliable and flexible industrial automation, it supports up to 512 I/O and features multiple chassis connectivity.

Specifications

General Information

• Brand: Allen-Bradley

• Product family: PLC-5

• Product type: Programmable Logic Controller

• Module type: Standard Processor

• Processor: PLC-5/20E

Memory

• Max user memory: 16 Kwords

• Battery-backed static RAM: Yes

• Battery: 1770-XYC

• EEPROM backup support: 1785-ME16, -ME32, -ME64, -M100

• Protected memory: No

I/O Capabilities

• Max total I/O: 512 (any mix) or 512 in + 512 out (complementary)

• Max analog I/O: 512

• Remote I/O chassis supported: 12

• Max I/O chassis total: 13

• Max extended local chassis: 0

• Max universal remote I/O: 12

• Max number of I/O racks: 4 (0–3)

• I/O scan time per rack:

• 10 ms at 57.6 kbit/s

• 7 ms at 115.2 kbit/s

• 3 ms at 230.4 Mbit/s

Communication Interfaces

• Embedded interfaces:

• 1 DH+ (fixed)

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

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

• Ethernet

• Control coprocessor expansion port: Yes

Electrical

• Backplane current load: 2.3 A

• Power dissipation: 12 W

• Power supply: 1771-P4S, -P6S, -P4S1, -P6S1