1785-L20C15

Overview

The 1785-L20C15 is a ControlNet-enabled PLC-5 processor module by Allen-Bradley, offering high-speed I/O scanning and large memory capacity for mid- to large-scale automation systems.

Processor & Memory

• Processor Type: PLC-5/20C

• Max User Memory: 16K words

• Battery-Backed RAM: Yes

• EEPROM Backup Support: Yes (compatible with 1785-ME16/-ME32/-ME64/-M100)

• Protected Memory: Not supported

I/O Capacity

• Max Total I/O (Forcible): 512 (any mix) or 384 input + 384 output

• Max Total I/O (Nonforcible): 3200

• Max Analog I/O (Forcible): 512

• Max Analog I/O (Nonforcible): 32,000

I/O Performance

• ControlNet I/O Scan Time: ~0.5 ms (average)

• Universal Remote I/O Scan Time:
  • 10 ms at 57.6 kbps
  • 7 ms at 115.2 kbps
  • 3 ms at 230.4 kbps

Expansion & Connectivity

• Max I/O Chassis Supported: 77

• Universal Remote I/O Chassis: 12

• Extended Local I/O Chassis: 0

• Serial Ports: 1 (RS-232-C/422-A/423-A)

• Coprocessor Expansion Port: Supported

---