| Manufacturer | Industrial Automation |
| Brand | Allen-Bradley |
| Part Number/Catalog No. | PLC-5-20C |
| Module Type | ControlNet PLC-5 Processor |
| Cat Number | 1785-L20C |
| Max User Memory Words | 16 Kilowords |
| Battery-Backed Static RAM | Yes |
| EEPROM Program Backup Option (using 1785-ME16, -ME32, -ME64, and -M100) | Yes |
| Protected Memory | No |
| Max Total I/O | Forcible 512 (any mix) or 384 in + 384 out (complementary), Nonforcible 3200 |
| Max Analog I/O | Forcible 512 and Nonforcible 32000 |
| I/O Scan Time Per Rack | ControlNet I/O 0.5 ms (average); Universal Remote I/O 10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s |
| Max I/O Chassis Total | 77 |
| Max I/O Chassis Extended Local | 0 |
| Max I/O Chassis Universal Remote | 12 |
| RS-232-C/422-A/423- A Ports | 1 |
| Control Coprocessor Expansion Port | Yes |
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